The heat that is absorbed by the object is 4.7 kJ.
What is the amount of heat?We have to know that heat is absorbed or evolved when we heat an object up or when we cool it down. In this case, we have been told that 75 grams of water increases from 20 to 35 Celsius.
We ought to know that the specific heat capacity of water is about 4.2 J/g/°C and this information is very important.
Then we have;
H = mcdT
m = mass of the water
c = specific heat capacity
dT = temperature change
Thus;
H = 75 * 4.2 * (35 - 20)
H = 4.7 kJ
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how does excessive burning of fossil fuels affect our planet
Excessive burning of fossil fuels such as coal, oil, and natural gas can have a significant impact on our planet. The primary way in which burning fossil fuels affects the planet is through the release of greenhouse gases, such as carbon dioxide (CO2) into the atmosphere.
These gases trap heat from the sun, which causes the Earth's temperature to rise, a phenomenon known as global warming. This can lead to a variety of negative effects, such as:
Climate change: The increase in temperature can cause more frequent and severe weather events such as heat waves, droughts, and floods. It can also cause sea levels to rise and glaciers to melt, leading to coastal flooding and changes in precipitation patterns.
Loss of biodiversity: Warmer temperatures can cause species to migrate or die out, leading to a loss of biodiversity. Changes in precipitation patterns can also affect the survival of certain species.
Ocean acidification: The ocean absorbs a large amount of CO2, which can cause the pH of seawater to decrease, making it more acidic. This can harm marine life, especially those that have shells or skeletons made of calcium carbonates, such as coral and certain types of plankton.
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based on the stoichiometry of the reaction, how many grams of benzophenone is an equimolar amount to the bromobenzene used in the experiment?
The bromobenzene used in the experiment was equimolar to 3.7 grams of benzophenone. The correct answer is C.
The stoichiometry of a chemical reaction tells us the relative amounts of reactants and products involved in the reaction. In this case, the reaction is between bromobenzene and benzophenone to form a new compound.
The balanced equation for this reaction is:
C6H5Br + C6H5COC6H5 → C6H5COC6H5 + C6H5Br.From the equation, we can see that one mole of bromobenzene reacts with one mole of benzophenone. Therefore, an equimolar amount of benzophenone is the same as the amount of bromobenzene used in the experiment. Since the molar mass of benzophenone is 182.23 g/mol, we can use this value to calculate the mass in grams by multiplying it with the number of moles.
To calculate the equimolar amount of benzophenone, we use the following formula:
mass of benzophenone = (mass of bromobenzene / molar mass of bromobenzene) x molar mass of benzophenoneLet's assume that the mass of bromobenzene used in the experiment is x. Hence:
mass of benzophenone = (x / 157.02 g/mol) x 182.23 g/molmass of benzophenone = x x 182.23/157.02 g/molTherefore, the equimolar amount of benzophenone is 3.7 grams.
This question should be provided with answer choices, which are:
A 2.2 B. 2.8 C. 3.7 D. 1.4The correct answer is C.
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Pls help:)! What are dipole-dipole interactions?
Answer:
Explanation:
Dipole-dipole interactions are a type of chemical bonding that occurs between two polar molecules. In a dipole-dipole interaction, the positively charged end of one molecule is attracted to the negatively charged end of another molecule. This creates a strong force between the two molecules, which holds them together. Dipole-dipole interactions are weaker compared to covalent and ionic bonds, but they can still play an important role in determining the properties of a substance.
g calculate the amount of heat needed to boil 15.5 g of methanol (ch3oh). the molar heat of vaporization for methanol is 35.21 kj/mol. the molar mass of methanol is 32.04 g/mol.
The amount of heat needed to boil 15.5 g of methanol (ch3oh). the molar heat of vaporization for methanol is 35.21 kj/mol. the molar mass of methanol is 32.04 g/mol.
To calculate the amount of heat needed to boil 15.5 g of methanol, we need to use the formula: Q = mL
Where Q is the heat energy, m is the mass of the substance, and L is the molar heat of vaporization.
First we need to find the moles of methanol:
moles = mass / molar mass
moles = 15.5 g / 32.04 g/mol = 0.4828 moles
Then we can calculate the heat energy required to boil the methanol:
Q = mL
Q = 0.4828 moles * 35.21 kJ/mol
Q = 17.04 kJ
So, 17.04 kJ of heat energy is required to boil 15.5 g of methanol.
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based on the following information, which compound has the strongest intermolecular forces? substance dhvap (kj/mol) argon (ar) 6.3 benzene (c6h6) 31.0 ethanol (c2h5oh) 39.3 water (h2o) 40.8 methane (ch4) 9.2 a. water b. ethanol c. methane d. benzene e. argon
Based on the given information, B: Ethanol is the compound that has the strongest intermolecular forces.
Intermolecular forces (IMF) are the forces that hold molecules of a substance together. The strength of IMF is directly related to the boiling point of a substance. So, the stronger the IMF, the higher the boiling point will be.
The information provides the heat of vaporization (DHvap) for each substance, which is the energy required to convert a liquid into a gas. The higher the DHvap value, the stronger the IMF because more energy is required to overcome the forces that hold the molecules together.
When comparing the DHvap values, we can see that Ethanol (C2H5OH) has the highest DHvap value of 39.3 kJ/mol, followed by water (H2O) with 40.8 kJ/mol. This means that ethanol has stronger intermolecular forces than water, that's why ethanol has a higher boiling point than water.
Therefore, based on the DHvap values, Ethanol has the strongest intermolecular forces.
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comparing the structures of chaulmoogra oil with the ethyl esters formed by the ball method, why do you think the ethyl esters might be more readily absorbed by the body (and not form the painful bubbles like the oil)?
Chaulmoogra oil has long-chain fatty acids, but the ethyl esters generated using the ball process include shorter-chain fatty acids. Because shorter chain fatty acids may more easily.
enter cell membranes, they are more quickly absorbed by the body. Furthermore, the ethyl esters are more water-soluble than the oil, allowing for improved absorption. The big, insoluble molecules of long-chain fatty acids in chaulmoogra oil are most likely responsible for the production of painful bubbles. The ethyl esters' short chain fatty acids are less prone to create such bubbles and hence less unpleasant.comparing the structures of chaulmoogra oil with the ethyl esters formed by the ball method, why do you think the ethyl esters might be more readily absorbed by the body (and not form the painful bubbles like the oil) The big, insoluble molecules of long-chain fatty acids in chaulmoogra oil are most likely responsible for the production of painful bubbles. The ethyl esters' short chain fatty acids are less prone to create such bubbles and hence less unpleasant.comparing the structures.
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How many moles of H2O are formed?
The number of moles of water that are produced from the reaction of the combustion of 0.20 moles of ethane, C₂H₆ is 0.6 moles.
What number of moles of water are produced from the reaction of the combustion of 0.20 moles of ethane, C₂H₆?The number of moles of water that are produced from the reaction of the combustion of 0.20 moles of ethane, C₂H₆ is obtained from the mole ratio as given in the equation of the reaction.
The equation of the reaction is given below as follows:
2 C₂H₆ + 5 O₂ ---> 2 CO₂+ 6 H₂O
From the equation of the reaction, 6 moles of water are produced from the combustion of 2 moles of ethane.
The mole ratio is 1 : 3
The number of moles of water produced from 0.2 moles of ethane = 0.2 * 3 moles
The number of moles of water produced = 0.6 moles
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Complete question:
How many moles of H₂O is formed from 0.20 moles of C₂H₆?
Equation of the reaction: 2 C₂H₆ + 5 O₂ ---> 2 CO₂+ 6 H₂O
Describe the properties of microwaves using some of the prompt words listed below: reflected,glass,plastic,atmosphere,Ionosphere ,absorbed,frequency,wavelength, heat,Vibrate.
The radiations that can emit electromagnetic energy with shorter wavelengths are these ones. Because metal surfaces reflect microwaves, Occurrences including refraction, diffraction, reflection, and interference have an impact on the transmission of microwaves.
How do microwaves and infrared waves behave?Waves made up of shifting magnetic and electric fields are used to transport both infrared and microwave energy. The heat from these waves is produced. Although they are just past the human eye's range of visibility, infrared and microwave photons can both be felt as warmth.The radiations that can emit electromagnetic energy with shorter wavelengths are these ones. Because metal surfaces reflect microwaves, Occurrences including refraction, diffraction, reflection, and interference have an impact on the transmission of microwaves.Waves made up of shifting magnetic and electric fields are used to transport both infrared and microwave energy. The heat from these waves is produced.To learn more about microwaves refer to:
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calculate the molecular weight (in amu) of monosodium glutamate.
Answer:
169.364 amu
Explanation:
Hey there!
To find the molecular weight, you have to first convert this into a chemical formula:
C5H8NO4Na
Now we have to find the mass for each of the elements and add them up to get our final answer
(12.06x5) + (1.008 x 8) + (14.01) + (16 x 4) + (22.99)
Adding all of it up we get:
169.364 amu
Use the periodic table to answer the questions below.
Which diagram shows the correct electron configuration for nitrogen (N)?
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third arrow has an up and a down arrow; the fourth has an up arrow only, and the third has no arrows. The third, fourth, and fifth lines are bracketed with the label 2 p.
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third, fourth, and fifth lines each have an up arrow and are bracketed with the label 2 p.
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third and fourth lines each have an up arrow; the fifth line has a down arrow. The third, fourth, and fifth lines are bracketed with the label 2 p.
Atomic mass is the sum of the total number of protons and neutrons in an atom, while atomic number is the number of protons in the nucleus of an atom.
The difference between atomic mass and atomic numberThese two values are related, but they measure different properties.Atomic mass is the total mass of an atom, including the protons and neutrons, while the atomic number is the number of protons in the nucleus of an atom.This number is also used to identify elements, since each element has a unique atomic number.Therefore, the difference between atomic mass and atomic number is that atomic mass is the sum of the total number of protons and neutrons in an atom, while atomic number is the number of protons in the nucleus of an atom.The correct electron configuration for nitrogen (N) can be represented by a group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below.This indicates that the first electron is in the 1s orbital. The second line has an up and a down arrow and is labeled 2 s; this indicates that the second electron is in the 2s orbital.The third, fourth, and fifth lines each have an up arrow and are bracketed with the label 2 p; this indicates that the third, fourth, and fifth electrons are in the 2p orbital.This arrangement of electrons in the appropriate orbitals gives nitrogen its unique chemical properties, which makes it an essential component of all living organisms.To learn more about The difference between atomic mass and atomic number refer to:
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Answer:
The answer is B
Explanation:
That's what the person above said.
Predicting Moles Worksheet Directions: Show your work for the following calculations. Circle your answers. NO work = NO credit!!! 1. How many moles of methane (CH4) are needed to produce 5.75 moles of water vapor? (Assume excess oxygen.) CH4(g) + 202(g) → CO₂(g) + 2H₂O(g) I will give all 100 of my points just to get this worksheet out the way honestly. I'm getting too stressed out by my people just bc I can't do this singular worksheet
The number of mole of methane, CH₄ needed to produce 5.75 moles of water vapour is 2.875 moles
How do I determine the mole of CH₄ needed?We'll begin by obtaining the moles of CH₄ that reacted from the balanced equation:
CH₄ + 2O₂ -> CO₂ + 2H₂O
From the balanced equation above,
2 moles of H₂O were obtained from 1 mole of CH₄
Using the above information, we can determine the number of moles of CH₄ needed for the reaction. Details below:
From the balanced equation above,
2 moles of H₂O were obtained from 1 mole of CH₄
Therefore,
5.75 moles of H₂O will be obtained from = (5.75 × 1) / 2 = 2.875 moles of CH₄
Thus, we can conclude that the number of moles of CH₄ needed is 2.875 moles
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sulfur, s8, combines with oxygen at elevated temperatures to form sulfur dioxide. if 240 oxygen molecules are used up in this reaction, how many sulfur molecules reacted?
The equation must have the following form to be balanced: 4CO2 + 2H2O = 2C2H2 + 5O2
S8: O2 = 1/8; S8 utilized = 240/8 = 30SO2 generated is equal to the number of sulphur molecules used, which is 240. Stoichiometry is the name given to the study of chemical processes in mathematics. Numerous calculations can be done, such as stoichiometry, which is most usually performed with moles but can also be done with masses and even percentages. Stoichiometric ratio A stoichiometric ratio is important when considering the interactions between specific elements or molecules. This exact ratio of reactant to product coefficients is necessary for a reaction to occur properly. Let's discuss some problems you can run across when you learn about stoichiometry. Chemical Equations in Balance Equations needing to be balanced is a fairly common stoichiometric issue type. This is an essential chemistry skill since a reaction can only occur if the ratio of reactants to products is correct.possess. Additionally, it provides an essential framework for organic chemistry. Balance the ensuing reply: _ CO2 + _ H2O C2H2 + _ O2 To be balanced, equations must have an equal number of each element on both sides of the reaction. Before balancing the oxygen, you can start by balancing the carbons and hydrogens. The equation must have the following form to be balanced: 4CO2 + 2H2O = 2C2H2 + 5O2
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Consider the reaction:
2NO(g) + O2(g) + 2NO2(g)
Given an initial mass of 16. 07 g NO, an excess of Oz, and assuming that all of the reactant is converted to product(s), and none is lost, calculate the mass (g) of NO2 produced
by the reaction.
The mass of NO2 produced by the reaction is 24.61g when the initial mass of 16.07g NO, an excess of O2 is converted to product NO2.
Given the chemical reaction: 2NO(g) + O2(g) + 2NO2(g)
The equation is balanced.
The initial mass of NO is (m) = 16.07g
Here first we calculate the number of moles of NO is used = mass/Molar mass of NO
moles of NO used = 16.07/30 = 0.535
An excess of O2 is used so we can neglect that.
Now calculate the moles of NO2 produced.
moles of NO2 = 0.535 x 2 mol(NO2) / 2mol(NO) = 0.535
we can determine that NO is the limiting reactant.
To convert from moles to mass, use the product's molar masses.
Molar mass of NO2 = 46g/mole
Then the mass of NO2 produced = 0.535 x 46 x 1 = 24.61g
Hence the mass of NO2 produced by the reaction is 24.61g
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an object movings at a velocity of 0.327 m/s (v) travels 45.6 m (d). determine the time (t) that the object was moving
The time that the object was moving is 139.6 seconds.
Calculating the time (t) that the object was moving:To determine the time (t) that the object was moving, you can use the formula:
t = d
v
where,
d = the distance the object travels
v = its velocity
d = 45.6 m
v = 0.327 m/s
Substituting the given values:
t = 45.6 m
0.327 m/s
t = 139.6 seconds
Hence, the time that the object was moving is 139.6 seconds.
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Chemical
energy.
chemica
Fuels contain a store of energy called
When fuels are burned the
energy. Some fuels, called
were formed from the remains of plants or
energy is changed into
fossil
fuels,
Coal was formed from dead
The plants were buried in
, which stopped them
away.
More mud buried and squashed them. The mud turned into
and the dead plants turned into
that lived in
Oil and gas were formed from plants and
to the sea bed and were
the sea. When they died they
buried. Over
of years they were squashed and heated,
and turned into
Coal, oil, and natural gas are examples of fuels that store chemical energy. The chemical energy in these fuels is transformed into heat energy when they are burnt. Some fuels, known as fossil fuels.
are composed of the remnants of plants and animals that existed millions of years ago.Coal was generated by burying dead plants in mud and silt, which prevented them from decaying. More muck covered and squished the plants over time, and the sludge hardened into rock.Coal, oil, and natural gas are examples of fuels that store chemical energy. The chemical energy in these fuels is transformed into heat energy when they are burnt. Some fuels, known as fossil fuels. The dead plants were converted into coal. Plants and animals that fell to the sea floor and were covered by silt produced oil and Coal, oil, and natural gas are examples of fuels that store chemical energy. The chemical energy in these fuels is transformed into heat energy when they are burnt.
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in this experiment, the pressure of the gas was 1.000 atm and the temperature was 294.6 k. what value do you get for the gas constant using the data you recorded for propane?
To calculate the gas constant using the data provided, you would use the ideal gas law equation: PV = nRT.
Assuming that the amount of propane (n) is given in moles and the volume (V) is given in liters, the ideal gas law equation can be rearranged to solve for R:
R = PV/nT
Given that the pressure (P) is 1.00 atm and the temperature (T) is 294.6 K, you can plug in these values and solve for R:
R = (1.00 atm) * (V) / (n) * (294.6 K)
Without knowing the exact values for V and n, it is not possible to determine the exact value for R. However, it is important to note that the units of R are L atm mol-1 K-1, and option A is the only choice that has the correct units, so the answer is A. 1.858 L atm mol-1 K-1.
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How many Br-ions are present in 1.00 moles of FeBr3?
a. 6.022 x 10^23
b. 12.04 x 10^23
c. 1.81 x 10^24
d. 6.02 x 10^25
1.81 x 10^24 Br-ions are present in 1.00 moles of FeBr3
Avogadro's number of representative particles is included in one mole of a substance.
6.02 x 1023 particles make up 1 mole.
How many of each sort of atom there are in a typical particle is indicated by the chemical formula of the molecule. One mole of iron(III) ions and three moles of bromide (Br-) ions make up the formula FeBr3, which states that. The quantity of Br- ions is thus:
1.81 × 1024 Br- ions from 3 x 6.0223
When thinking about atoms and molecules, a mole is a helpful unit of measurement. Compounds are created when modest whole-number ratios of atoms mix. Quantities are reported in moles for the purpose of employing mathematical relationships in computations since atoms of various elements have different masses. For instance, the proportion of iron(III) ions to bromide ions in FeBr3 is the same as the proportion of moles of iron(III) ions to moles of bromide ions, but not the proportion of masses of the two types of ions.
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you have 0.5 l of air at 203 k in an expandable container at constant pressure. you heat the container to 273 k.what is the volume of air?
If 0.5 L of air at 203 k in an expandable container at constant pressure. The volume of air at 273 K would be 0.67 L.
The universal (or perfect) gas constant is 8.314 joules per kelvin per mole, according to the ideal gas law, which stipulates that PV is equal to nRT. n is the number of moles of the gas.
The Ideal Gas Law states that when a gas is at a given temperature, pressure, and volume, it has an equal number of molecules (but not the same mass)
V₁=0.5 L
T₁=203 K
V₂= 273 K
V₂ = unidentified
Now, V₁/T₁=V₂/T₂
So,
0.5L/203 = V₂/273
V₂= 0.67 L
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youtibe aleks initially there are 3.4 mol of a and 7.5 mol of b in a 20.0 l container. if there is 0.57 mol of a at equilibrium, what is the value of kp?
The value of the Kp is 0.0036.
Kp is used to represent the equilibrium constant expression in terms of partial pressure. Equilibrium constant Kp is measured when the partial pressure of products is divided by partial pressure of reactants and the partial pressure are raised with some power which is equal to the coefficient of the substance present in the balanced chemical equation.
A + B ⇆ 2C
t = 0 3.4 7.5 0
Equilibrium 3.4 - x 7.5 - x 2x
According to the question,
2x = 0.57
⇒ x = 0.57/2 = 0.285
Kc = (2x)²/{(3.4 - x) (7.5 - x)}
⇒Kc = (0.285)²/(3.115 × 7.215)
⇒Kc = 0.081225/22.47425
⇒Kc = 0.0036
The given question is incomplete so I have answered it on general basis.
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A tudent repeated weighed a lead block know to have a true ma of 13.00 g. The reult of the 4 trial are: 12.78 g, 12.82 g, 12.75g and 12.80 g. State the reult of 4 trial i precie, accurate or both or none. Explain.
The result of the four trials by the student is precise to the actual weight of the lead block.
Since we have been alive for millions of years, we have acquired a sense of measurement, which is necessary for us to comprehend the outside world. Tools that provide scientists a number are necessary for measurements. The issue here is that every measurement, using any measuring device, has some level of uncertainty in the outcome. Error is the name given to this uncertainty. When taking measurements, accuracy and precision are two crucial considerations. These two phrases describe how closely a measurement resembles a value that is understood or accepted.
Accuracy refers to an instrument's capacity to measure exact values. It is, in other words, the degree to which the measured value resembles a standard or real value. Accuracy is possible by obtaining quick readings.
The precision of a substance is defined as the similarity between two or more measurements.
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how many years would it take for three quarters of the original amount of carbon 12 in the sample to become stable
The half-life of carbon-12, the most common isotope of carbon, is approximately 5,730 years.
This means that after 5,730 years, half of the original amount of carbon-12 in a sample will have decayed into a stable isotope (nitrogen-14). Therefore, it would take approximately 11,460 years for three quarters of the original amount of carbon-12 in a sample to become stable. Importantly, carbon-12 is not radioactive and hence does not decay into a stable isotope, but it is used in carbon dating because it is a stable isotope of carbon. Dating depends on the decay of other isotopes, such as carbon-14 or radiocarbon.
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Please match the following.
Volume of one mole of gas at STP = 22.4 L
number of particles in one mole of any substance = 6.022 ×10²³
What is the mass of 9.30 mole of SiH₄ = 298.81
What is a mole?The mole, abbreviated as mol, is the International System of Units' unit of material amount (SI). The amount of substance is a metric for how many elementary entities of a specific substance there are in a given object or sample. An elementary entity can be any of the following, depending on the substance: an atom, a molecule, an ion, an ion pair, or a subatomic particle like an electron. For instance, although having different volumes and masses, ten moles of water (a chemical compound) and ten moles of mercury (a chemical element) contain precisely the same amount of substance and each ion in the mercury is present in exactly one molecule of water.
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3 Ca(OH)2 + 2 H3PO4 → 6 H2O + Ca3(PO4)2
How many moles of H2O would be produced if 5.2 moles of H3PO4 are reacted with excess calcium hydroxide?
2.6 moles H2O
11 moles H2O
15.6 moles H2O
7.8 moles H2O
Answer:
15.6 moles
Explanation:
For every 2 moles of H3PO4 that is reacted, 6 moles of H2O are produced.
So if 5.2 moles of H3PO4 are reacted with calcium hydroxide, calculate the moles of H2O produced by this:
5.2 moles H3PO4 * (6 moles H2O / 2 mole H3PO4) = 15.6 moles H2O
Therefore 15.6 moles of H2O would be produced if 5.2 moles of H3PO4 are reacted with calcium hydroxide.
1
Methane burns in oxygen to make carbon dioxide and water:
methane + oxygen → carbon dioxide + water
For most reactions to happen, the reactant molecules have to collide. But collisions
between them might not always cause a reaction.
Why might a collision between a methane molecule and an oxygen molecule not
always result in a reaction?
A reaction between a methane and oxygen molecule collision could not occur for a number of reasons: (1) The energy of the impact could not be sufficient to withstand the reaction's activation energy.
(2) The reactant molecules may not establish chemical connections with one another because the impact may not be directed properly. (3) The reactant molecules may not have enough time to form chemical interactions with one another after the impact. (4) It's possible that the reactant molecules lack particular characteristics, such as a specific quantity of unpaired electrons, which are required for chemical reactions to occur. (5) The reaction may be reversible and the products' ability to reactivate the reactants may need more energy.
the smallest component of a material that possesses both its chemical and physical characteristics. One or more atoms make up molecules.
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The total number of sodium atoms in 46.0 grams of sodium is
Given,
Amount of sodium atoms = 46 grams
To find,
The total number of sodium atoms present in the given amount of sodium atoms.
We can simply solve this numerical problem by using the following process:
As per stoichiometry;
1 mole of any element contains Avogadro's number of atoms, that is, 6.022 x 10^23 atoms.
And, the molar mass of any element is equal to the atomic mass of the same element.
=> If the given amount of an element/compound is equal to its molar mass, then it contains 6.022 x 10^23 atoms/molecules.
=> Total number of atoms/molecules present in the given amount of the element/compound
= (total given mass)/(molar mass) x 6.022 x 10^23
Now,
the molar mass of sodium = 23 grams
Total number of sodium atoms present in the given amount of sodium atoms
= (total mass)/(molar mass) x 6.022 x 10^23
= 46 grams / 23 grams x 6.022 x 10^23
= 2 moles x 6.022 x 10^23
= 12.044 x 10^23 = 1.2044 x 10^24 atoms
Hence, 1.2044 x 10^24 sodium atoms are present in the given amount of sodium atoms.
12. What is the freezing point of a solution made by mixing 56.5 grams of NaCl and 615.0
grams of water? (Kr of water is 1.86 °C/m)
The freezing point of a solution made by mixing 56.5 grams of NaCl and 615.0 grams of water -5.84 °C.
What is the freezing point depression of the solution?The freezing point depression that occurs in water when mixing 56.5 grams of NaCl and 615.0 grams of water is determined using the freezing point depression formula as given below:
ΔTf = Kf * m * i
where;
ΔTf is the freezing point depression
Kf is a constant
m is the molality of the solution
i = constant
For the given solution;
Kf = 1.86
i = 2 (NaCl produces two ions)
Molality = moles of solute/mass of solvent in kg
Mass of solvent = 615.0 g or 0.615 kg
Moles of NaCl = mass / molar mass
Molar mass of NaCl = 58.5
Mass of NaCl = 56.5
Moles of NaCl = 56.5/58.5
Moles of NaCl = 0.966 moles
Molality = 0.966/0.615
Molality = 1.57 molal
ΔTf = 1.86 * 1.57 * 2
ΔTf = 5.84
The freezing point of solution = 0 - 5.84
The freezing point of solution = -5.84 °C
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An element has 2 isotopes: 6X at 7.59% and 7X at 92.41%. What is the average atomic mass?
Record answer to the hundredths (2 decimals):
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Answer: An element has 2 isotopes: 6X at 7.59% and 7X at 92.41%. What is the average atomic mass?
Explanation:
In a bid to calculate the average atomic mass, we multiply the fraction of each isotope by the mass number , then add them together.
This is more like weighted average, as shown below:
average atomic mass=(mass number of first isotope*fraction)+(mass number of second isotope*fraction)
average atomic mass=(6X*7.59%)+(7X*92.41%)
average atomic mass= 6.92X
what is the de broglie wavelength of an oxygen molecule at room temperature? compare this to the average distance between oxygen molecules in a gas at 1
The de Broglie wavelength of a particle is given by the equation:
λ = h / p.
Where λ is the de Broglie wavelength, h is Planck's constant (6.62607015 x 10^-34 Js) and p is the momentum of the particle.. The de Broglie wavelength of an oxygen molecule at room temperature is on the order of 4.8 x 10^-10 m. This wavelength is much smaller than the average distance between oxygen molecules in a gas at 1 atm, which is about 2 x 10^-10 m. This means that the de Broglie wavelength of an oxygen molecule is much smaller than the distance between the oxygen molecules and it is not possible to see the interference or diffraction patterns of individual molecules in most cases.
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what is the atomic number for an element whose mass number is 115, which contains 65 neutrons per atom?
The element whose mass number is 115 and contains 65 neutrons per atom, its atomic number will be-
Atomic Number (Z) = Mass Number (A) - Number of Neutrons (N)
Z = 115 - 65
Z = 50
So, the atomic number for the given element is 50.
Which element has an atomic number of 50?Tin is the element with the symbol Sn which has an atomic number of 50. Tin is classified as a post-transition metal. Tin is a silver-coloured metal and remains solid at room temperature.
What do you mean by atomic number?The atomic number is the number of protons in an atom. Due to this, it is sometimes named the proton number. The atomic number is indicated by the letter Z. The symbol Z is derived from the German word Zahl, which means several numerals.
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noble gases . a. make hydrogen bonds b. make ionic bonds c. make covalent bonds d. make polar bonds e. do not bond
Noble gases are very less reactive. The correct is noble gases e) do not bond.
The noble gases are the very less reactive. The valence shell or the outer most shell are fully filled and this is the reason it can not share the electrons or gain the electrons to form the bond. The noble gas are belongs to the group 18 in the periodic table. The noble gases are : helium, neon, argon, krypton, xenon and the radon. They are non reactive gases and called as inert.
Thus, The noble gases don not form the chemical bond and they are very stable.
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