2.55 × 10²⁴ molecules H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 76.4 g H₂O
[Solve] molecules H₂O
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of H - 1.01 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 76.4 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O})(\frac{6.022 \cdot 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 2.55317 \cdot 10^{24} \ molecules \ H_2O[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2.55317 × 10²⁴ molecules H₂O ≈ 2.55 × 10²⁴ molecules H₂O
Imagine there is less gravity on Earth for
one day. List THREE ways that you would make the most of this
situation, and give a reason for each one.
Answer:
Three ways that I would make most of this situation are going near an area to avoid the things drifting into space. I would seek shelter in a basement. I would also stay indoors.
Earth's atmosphere and its oceans, rivers, and lakes would be one of the first things to drift away into space, we would need to avoid those obstacles by seeking shelter. The first problem is that Earth is rotating at high speed, rather like the way a weight on a string rotates if you spin it around your head. Anyone unfortunate enough to be outside at the time would quickly be lost. People inside buildings would be safer because most buildings are so firmly rooted to the ground that they would stay put even without gravity – at least for a while.
Gravity is the universal force that attracts matter. If there is less gravity, then the objects on the Earth will become weightless.
What is gravity?Gravity or the gravitational force is the fundamental force present in the universe that keeps the matter attracted to each other. It plays a major role in the rotation of the earth around the sun and keeps the atmosphere of the planet balanced.
In case of no gravity, the objects will become weightless and will start to float, and Earth will stop rotating and will collide with the sun. Also, the moon will collide with the earth and the objects will perish in the universe.
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Which of the following is the correct definition of "weathering"? *
The movement of rocks
The breakdown of rocks.
The dropping off of rocks
All of the above
Which of the subatomic particles affects the mass number of your atom or ion?
Answer:
The number of protons determines an element's atomic number and is used to distinguish one element from another. The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess.
PLS HELP URGENT I WILL MAKE BRAINLY AND LIKE FIVE STARS
1. How do aquatic animals obtain oxygen?
They weather sediment to release oxygen.
They filter the water for dissolved oxygen.
They breakdown seashells and other organic materials.
They separate oxygen from hydrogen in water molecules.
1
Answer:
the second one filter for dissolved
Explanation:
Answer:
They filter the water for dissolved oxygen.
Explanation:
just took test
In a sealed container, 4.00 g of butane is reacted with 1.50 g of O. Calculate the maximum amount of carbon dioxide that could form in this reaction.
Answer:
[tex]m_{CO_2}=1.27gCO_2[/tex]
Explanation:
Hello!
In this case, since the combustion of butane is shown below:
[tex]C_4H_{10}+\frac{13}{2} O_2\rightarrow 4CO_2+5H_2O[/tex]
We can evidence the 1:4 and 13/2:4 mole ratio of butane to carbon dioxide and oxygen to carbon dioxide respectively. Thus, in order to compute the maximum amount of carbon dioxide produced in this reaction, we set up the following stoichiometric work:
[tex]m_{CO_2}^{by\ C_4H_{10}}=4.00gC_4H_{10}*\frac{1molC_4H_{10}}{58.12gC_4H_{10}}*\frac{4molCO_2}{1molC_4H_{10}}*\frac{44.01gCO_2}{1molCO_2}=12.11gCO_2\\\\ m_{CO_2}^{by\ O_2}=1.50gO_2*\frac{1molO_2}{32gO_2}*\frac{4molCO_2}{13/2molO_2}*\frac{44.01gCO_2}{1molCO_2}=1.27gCO_2[/tex]
Thus, since oxygen yields the fewest amount of carbon dioxide, we infer the former is the limiting reactant and therefore the maximum amount of carbon dioxide product is 1.27 g.
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What is true about the position of any metal in the periodic table
Answer:
The metals are on the bottom left in the periodic table, and the nonmetals are at the top right. The semimetals lie along a diagonal line separating the metals and nonmetals. The elements are arranged in a periodic table, which is probably the single most important learning aid in chemistry.
Explanation:
im not sure if there was supposed to options to that question or not
How many grams of CO2 are made from 10 moles of O2?
Answer:
100
Explanation:
When 136g of glycine are dissolved in of a certain mystery liquid , the freezing point of the solution is lower than the freezing point of pure . On the other hand, when of sodium chloride are dissolved in the same mass of , the freezing point of the solution is lower than the freezing point of pure . Calculate the van't Hoff factor for sodium chloride in . Be sure your answer has a unit symbol, if necessary, and round your answer to significant digits.
The given question is incomplete. The complete question is:
When 136 g of glycine are dissolved in 950 g of a certain mystery liquid X, the freezing point of the solution is 8.2C lower than the freezing point of pure X. On the other hand, when 136 g of sodium chloride are dissolved in the same mass of X, the freezing point of the solution is 20.0C lower than the freezing point of pure X. Calculate the van't Hoff factor for sodium chloride in X.
Answer: The vant hoff factor for sodium chloride in X is 1.9
Explanation:
Depression in freezing point is given by:
[tex]\Delta T_f=i\times K_f\times m[/tex]
[tex]\Delta T_f=T_f^0-T_f=8.2^0C[/tex] = Depression in freezing point
[tex]K_f[/tex] = freezing point constant
i = vant hoff factor = 1 ( for non electrolyte)
m= molality =[tex]\frac{136g\times 1000}{950g\times 75.07g/mol}=1.9[/tex]
[tex]8.2^0C=1\times K_f\times 1.9[/tex]
[tex]K_f=4.32^0C/m[/tex]
Now Depression in freezing point for sodium chloride is given by:
[tex]\Delta T_f=i\times K_f\times m[/tex]
[tex]\Delta T_f=20.0^0C[/tex] = Depression in freezing point
[tex]K_f[/tex] = freezing point constant
m= molality = [tex]\frac{136g\times 1000}{950g\times 58.5g/mol}=2.45[/tex]
[tex]20.0^0C=i\times 4.32^0C\times 2.45[/tex]
[tex]i=1.9[/tex]
Thus vant hoff factor for sodium chloride in X is 1.9
11. Write down the molecular formula of following compounds by
criss-cross
method
a. Ammonia
b. Methane
c. Common salt
d.Limestone
e.Hydrochleric acid
f.Caustic soda
Answer:
a. NH3
b.
c. NaCl
d.
e. HCl
f.
What does electronegativity mean?
Answer:
Electronegativity refers to the ability of an atom to attract shared electrons in a covalent bond. The higher the value of the electronegativity, the more strongly that element attracts the shared electrons.
Your welcome
What is one way that minerals crystallize from materials dissolved in water?
Answer:
From solutions that evaporate
From hot water solutions when the solution cools
Explanation:
The substances that can form minerals can be dissolved in the water to form a solution. Solution can be described as as a mixture in which a solute is dissolved in a solvent. When a particular dissolved solute evaporates from the solution, crystals of minerals might form. The mineral halite was formed when seas evaporated over a period of time.
The minerals can also be formed when a hot water solution gets cooled.
What are Renewable Resoures?
Answer:
resources that you can use more than 1 time like rechargeable battery or solar energy
Explanation:
Your science teacher has Your science teacher given you a triple beam
balance, a graduated cylinder and a beaker of water.
Explain how to find the density of an irregular
shaped object such as a small rock.
(Pls help me,I need a answer)
Answer:
See explanation.
Explanation:
Density is equal to mass divided by volume.
You can find the mass of the rock using the triple beam balance.
You can find the volume of the rock by pouring water from the beaker into the graduated cylinder, and seeing how much the volume of water in the cylinder changes. This change is the volume of the rock. For example, if you pour 50mL into the cylinder, add the rock, and see the new volume is 53mL, then the rock has a volume of 3mL or 3cm^3 (because one milliliter is equal to one cubic centimeter).
Then, divide the mass of the rock by the volume of the rock.
cells are not as large as this cube why summarize evidence to support your claim and explain your reasoning
A 75 L container holds 62 moles of gas at a temperature of 215 0C. What is the pressure in atmospheres inside the container?
Answer:
33
Explanation: first change the temperature in degree celcius to kelvin by adding 273 to 215 which makes 488 then input value into the formula pv=nrt p*75=62*0.08206*488 then divide both sides by 75 you get 33
The pressure of gas in the atmosphere is equal to 33.1 atm.
What is the ideal gas equation?The ideal gas law can be described as an equation of the state of a hypothetical ideal gas. This law states that the multiplication of the volume and pressure of one gram molecule of an ideal gas is equal to the product of the gas constant and absolute temperature.
The mathematical equation of the ideal gas law can be written as:
PV = nRT
where V is the volume, P is the pressure, n is the amount of substance and R is the gas constant.
Given the volume of the gas, V = 71 L
The number of moles of gas, n = 62
The temperature, T = 215 °C = 273 + 215 = 488 K
The value of the universal gas constant, R = 0.082 atm L/K mol
After substituting the all values in the ideal gas equation, we get:
P × 71 = 62 × 0.082 × 488
P = 33.1 atm
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Chemical energy can be transformed into mechanical energy in a fan. However, what is the step that is missing from the diagram that shows how this transformation works?
Question 17 options:
A. magnetic energy
B. transformational energy
C. electrical energy
D. heat energy
Answer:
we can't see the diagram
i need help asap pleaseeee
Which element is named for Alfred Nobel, the scientist who established the nobel prizes?
Answer:
#102 nobelium
Explanation:
nobel + ium = nobelium
An element named after Alfred Nobel who established Nobel prizes is Nobelium .
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.There are 118 elements which are confirmed to exist naturally or artificially.
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Explain about Bose-Einstein condensate.
Answer:
A Bose-Einstein condensate or BEC in simple words is a group of atoms cooled near absolute zero.
How many moles of Csl are in 82.0 grams of Csl?
Answer:
.315mol CsI
Explanation:
CsI has a molar mass of 260 g/mol. This means that one mole of cesium iodide has a mass of 260 grams. We can use stoichiometry/dimensional analysis to figure out how many moles is equal to 82 grams.
[tex]82.0g CsI (\frac{1 mole}{260g} ) = .315mol CsI[/tex]
Which of the following is a moral issue?
A. Not keeping accurate records of an experiment.
B. Conducting a drug experiment which will harm lab rats.
C. Accidentally reporting false data
D. Communicating false data from an experiment.
I WILL MARK AS BRAINLIEST IF YOU GIVE ME ANSWER
Which experiment would BEST investigate the effect temperature has on the volume of a gas?
A.
Measure the pressure of the air in a bicycle tire on a cold day.
B.
Stretch a balloon over the top of a beaker filled with baking soda and vinegar, then observe how the balloon changes volume as the reaction occurs.
C.
Measure the volume of a balloon filled with room temperature air; place the balloon in a freezer for an hour and measure its volume again.
D.
Inflate one balloon to a large volume and another balloon to a small volume. Measure the temperature of the air released from both balloons.
Answer:
C
Explanation:
Answer:
c
Explanation:
I think it is c because the tep. will change and the volume will change.
PleaSe help meeeeeeeeeeeeeeeeee
Answer:
Wet climates obviously have more water than driers climates. Metals, when subject to water have the tendency to oxidize rust. Therefore, if water is barely present in a climate, then oxidation is also least likely to occur.
Explanation:
Learnt it from reading a book
what energy is stored
Answer: potential energy is stored
Explanation:
A chemist titrates 50.0 mL of a 0.1333 M benzoic acid (HCH,CO2) solution with 0.2560M NaOH solution at 25 °C. Calculate the pH at equivalence. The
PK, of benzoic acid is 4.20.
Round your answer to 2 decimal places.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of NaOH solution added.
DH-0
5
?
Who was the scientist responsible for the theory of evolution by natural selection?
Answer:
Charles Darwin
Explanation:
Charles Darwin is more famous than his contemporary Alfred Russel Wallace who also developed the theory of evolution by natural selection. scientist who studies living organisms.J
Answer:
Charles Darwin
Explanation:
He was the one who created the theory of evolution by natural selection along with the co-discoverer Alfred Wallace in 1858.
I just did this topic like a few weeks ago.
Would an object with a higher specific heat absorb more or less energy when heated?
Answer:
less
Explanation:
the more heat it has, the less a given heat will affect it
Answer:
more heat
Explanation:
A group of students used this diagram to classify three organisms into different kingdoms
Knowing that Boyle's Law is PiV1 = P2V2, How would we rearrange the formula if we needed to solve for V2?
A. V2=P1V1/P2
B. V2= P1V1-P2
C. V2=P1/P2
D. V2= P V1 + P2
Answer:
A. V2=P1V1/P2
Explanation:
Robert Boyle law stated that pressure of a particular quantity of basis inversely varies with respect to the volume provided that the temperature is constant. It is expressed as
PiV1 = P2V2,
Where
V2= final volume
V1= initial volume
P1= initial pressure
P2= final pressure
Making V2 subject of formula we have
V2=P1V1/P2