Answer:
Final molarity of ammonium cation in the solution = 0.16 M
Explanation:
Complete Question
Suppose 2.59 g of ammonium nitrate is dissolved in 200. mL of a 0.40M aqueous solution of sodium chromate. Calculate the final molarity of ammonium cation in the solution. You can assume the volume of the solution doesn't change when the ammonium nitrate is dissolved in it. Be sure your answer has the correct number of significant digits.
Solution
2NH₄NO₃ + Na₂CrO₄ → (NH₄)₂CrO₄ + 2NaNO₃
We first convert the given parameters to number of moles
Number of moles = (Mass/Molar mass)
Molar mass of NH₄NO₃ = 80.043 g/mol
Number of moles of NH₄NO₃ = (2.59/80.043) = 0.03224 mole
Number of moles = (Concentration in mol/L) × (Volume in L)
Number of moles of Na₂CrO₄ = 0.4 × 0.2 = 0.08 Mole
2 moles of NH₄NO₃ react with 1 mole of Na₂CrO₄
So, it it evident that NH₄NO₃ is the limiting reagent as it is in short supply in the amount needed for the reaction.
So, the number of moles of ammonium ion in the product is also 0.03224 mole.
Molarity = (Number of moles)/(Volume L)
Molarity of ammonium ion = (0.03224/0.2) = 0.1612 mol/L = 0.16 M
Hope this Helps!!!
heterogeneous non example
Heterogeneous 'mixtures' (because they don't meet the definition of mixtures) are mixtures substances that aren't completely uniformly spread out. They haven't reacted with the solvent to become a solution.
Explanation: There are 2 types of heterogeneous solutions, A Colloid and a suspension.
Colloid: You can check if a mixture is heterogeneous by passing a light ray through it. This may cause the Tyndall effect (If the mixture is a colloid) when the Colloidal Heterogeneous mixture's particles are so small that they refract the beam of light and the path of light will be visible, like if you add 3 drops of milk in a glass of Water and shine a laser light through it. This is because the particles are too small to be seen by the unaided eye but big enough to scatter you laser light. However that particles won't settle down or will be separated by a filter paper due to particles' small size.
Suspension: A solution will be a solution when the particles of the Mixture is big enough to be seen by the unaided eye. Like if you mix sand and Water, the sand will eventually settle down due to Gravity. The mixture's solute will be big enough to pass through a filter paper.
What is the best definition of chemistry?
A. The study of mass, energy, and light
B. The study of life and energy
C. The study of experiments and theories
D. The study of matter, its properties, and its reactions
hurry please! avogadro's law relates the volume of a gas to the number of moles of gas when temperature and pressure are constant. according to this law, how many moles of gaseous product would be produced by 2 moles of gaseous reactants if the volume of the gases doubled?
Answer:
Option B. 4 moles of the gaseous product
Explanation:
Data obtained from the question include:
Initial volume (V1) = V
Initial number of mole (n1) = 2 moles
Final volume (V2) = 2V
Final number of mole (n2) =..?
Applying the Avogadro's law equation, we can obtain the number of mole of the gaseous product as follow:
V1/n1 = V2/n2
V/2 = 2V/n2
Cross multiply
V x n2 = 2 x 2V
Divide both side by V
n2 = (2 x 2V)/V
n2 = 2 x 2
n2 = 4 moles
Therefore, 4 moles of the gaseous product were produced.
If a sample of Fe2S3 contains 1.25x10ˣ15 iron atoms what is the mass in grams?
Answer:
mass = 0.00000043189g
10. Write the word equation of the following skeleton equation.
CuCl(aq) + NaOH(aq) → Cu(OH),(s) + NaCl(aq)
Indicate the state of each substance in your word equation.
Someone help me out please
Answer:
See below.
Explanation:
Aqueous copper chloride reacts with sodium hydroxide aqueous solution to give a precipitate (solid) of copper hydroxide and aqueous sodium chloride.
Polarity of water. Which is the correct answer?
How would you measure the specific latent heat of vaporisation of a liquid?
Answer:
Ramsey and Marshall method.
Explanation:
The specific latent heat of vapourization of a liquid is measured by a modification of the method of Ramsey and Marshall in the year 1896.
If the haploid number of an organism is 32 how many pairs of chromosomes would be found in each of the cells of the adult organism
Answer:
32 pairs
Explanation:
Haploid number is half of the original number (diploid) of chromosomes in somatic cells. So, if the haploid number is 32, the diploid number will be 32x2= 64.
But since 2 chromosomes pair up to form a homologous chromosome pair, the number of pairs of chromosomes found will be 32.
If the haploid number of an organism is 32, then the pairs of chromosomes that would be found in each of the cells of the adult organism is 32. The correct option is C.
What is haploid organism?The presence of a single set of chromosomes in an organism's cells is referred to as haploidy.
Diploid organisms reproduce (having two sets of chromosomes, one from each parent). Only the egg and sperm cells in humans are haploid.
Humans are diploid, with 23 chromosome pairs in the majority of cells. Human gametes (egg and sperm cells) have a single set of chromosomes and are thus haploid.
If an organism's haploid number is 32, then the number of pairs of chromosomes found in each cell of the adult organism is 32. This simply means that in pair there will 64 chromosomes, means 32 pair.
Thus, the correct option is C.
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Hg(OH)2 + H3PO4 = Hg3(PO4)2 + H2O
Answer:
3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 + 6H2O
Select the correct answer.
Which of the following is a physical model of the Sun?
A.
an equation that describes the Sun's motion
В.
a chart that lists the temperatures of different parts of the Sun
C.
a computer program that shows how the Sun changes over time
D
a paragraph that describes the Sun's structure
E.
a small yellow ball that represents the Sun
Answer: E
Explanation: The ball is yellow so it can easily represent the sun
Propane (C3H8) reacts with oxygen (O2) during a combustion reaction, producing carbon dioxide
(CO2) and water (H2O).
Which equation demonstrates the law of conservation of matter for this reaction?
Answer:
C3H8 + 5 O2 ------> 3 CO2 + 4 H2O
Explanation:
Which is NOT a control in the following experiment?: An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same kind of coffee, the same coffee maker, the same amount and type of water, and the same electrical sources were used. While experimenting, the scientists notes that the more coffee grounds there were, the longer it took to brew.
Answer:
The same kind of coffee, the same coffee maker, the same amount and type of water, and the same electrical sources were used.
Explanation:
Which example is a long-term environmental change? La Niña El Niño climate change small asteroid impact
The correct answer is C. Climate change
Explanation:
Long-term environmental changes occur as major events affect the environment and ecosystems indefinitely. These events differ from short-term environmental changes because the effect of short-term environmental changes is mainly temporary. Also, long-term changes are usually gradual.
Climate change is an example of long-term environmental changes because this implies indefinite and major changes in weather patterns and ecosystems. For example, it is believed climate change will decrease the amount of ice in Earth, change sea level, and lead to the extinction of dozens of species. This does not occur with events such as el niño or a small asteroid impact that affect the environment for a short time and do not imply major changes.
Answer:
it is c) climate change
Explanation:
i just took the quiz
hope this helps!!! :D
What is chemical potential energy?
Answer:
Chemical potential energy is the energy stored in the chemical bonds of a substance.
Explanation:
E ) The distribution coefficient , Ko ( Cether / C water ) , for an organic substance X at room temperature is 13. What relative volume of ether to water should be used for the extraction of 94 percent of X from a water solution in single extraction ?
Answer:
Relative volume of ether to water that should be used for the extraction = 1.205
Explanation:
The extraction/distribution coefficient of an arbitrary solvent to water for a given substance is expressed as the mass concentration of the substance in the arbitrary solvent (C₁) divided by the mass concentration of the substance in water (C₂).
K = (C₁/C₂)
Let the initial mass of the organic substance X in water be 1 g (it could be any mass basically, it is just to select a right basis, since we are basically working with percentages here).
If 94% of the organic substance X is extracted by ether in a single extraction, 0.94 g ends up in ether and 0.06 g of the organic substance X that remains in water.
Let the volume of ether required be x mL.
Let the volume of water required be y mL.
Relative volume of ether to water that should be used for the extraction = (x/y)
Mass concentration of the organic substance X in ether = (0.94/x)
Mass concentration of organic substance X in water = (0.06/y)
The distribution coefficient , Ko (Cether / C water), for an organic substance X at room temperature is 13.
13 = (0.94/x) ÷ (0.06/y)
13 = (0.94/x) × (y/0.06)
13 = (15.667y/x)
(x/y) = (15.667/13) = 1.205
Hope this Helps!!!
The combustion of methane is a reaction commonly used in chemistry problems due to its ability to fit into multiple topics. So it should not surprise you to see it here as well. How many L of CO2 would be produced if 45 g of CH4 was combusted with ample oxygen in a room that was 90 degrees Celsius and under 1 atm of pressure
Answer:
20.76 L OF CO2 WILL BE PRODUCED BY 45 G OF METHANE.
Explanation:
Equation of the reaction:
CH4 + 02 --------> CO2 + 2H20
Molar mass of methane = ( 12+ 1*4) g/mol = 16 g/mol
Calculate the number of moles present in 45 g of methane
1 mole of methane = 16 g / mol of methane
(45 / 16) mole of methane = 45 g of methane
= 2.8125 moles
Using the ideal gas equation:
PV = nRT
P = 1 atm
n = 2.812 moles
T = 90 C
R = 0.082 L atm/ mol C
V = unknown
So we have:
V = nRT / P
V = 2.8125 * 0.082 * 90 / 1
V = 20.756 L
In the production of CO2 by 45 g of methane, 20.756 L of methane was used.
Then, the volume of CO2 produced by this volume will be 20.756 L since 1 mole of methane produces 1 mole of CO2.
In other words;
1 mole of CH4 = 1 mole of CO2
22.4 dm3 of CH4 = 22.4 dm3 of CO2
20.76 DM3 = 20.76 dm3
The volume of CO2 produced will therefore be 20.76 L
Question: Which is the best analogy for classification? A.Classification is like setting up a phone tree in which one person calls the next two people, and those people call the next four people. B.Classification is like creating an alphabetized list of people based on their last names. C.Classification is like organizing a car wash where everyone brings needed items and then works. D.Classification is like organizing a closet by hanging clothes together based on their type, color, and season. *15 points cuz i'm low on points oof* *science NOT chemistry*
Answer:
The last one
Explanation:
When we are classifying we try to distinguish between the type, the properties just like clothes
Which is a negative effect of deforestation on the environment? habitat restoration, desertification, soil production, or urbanization
Answer:
The correct option is desertification
Explanation:
Deforestation is the deliberate act of pulling down trees to provide a clear land for space or to make use of the trees for other purposes such as grazing, farming, timber fire wood, building and constructions, urban utilization, access roads, expansion, development of infrastructures, grazing of cattle and mining
The effects of deforestation includes climate change, flooding, increase in the proportion of green house gases in the atmosphere, soil erosion and desertification.
A negative effect of deforestation is desertification.
Deforestation refers to the cutting down of trees. There are many reasons why people may cut down trees. One of the popular reasons why people cut down trees is to obtain timber which is used for construction and as fuel.
An important consequence of the felling of trees also called deforestation is that a once fertile land may gradually be turned into a desert area. This is known as desertification.
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5. How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S 8 )?
Answer:
There are [tex]1.202\times 10^{24}[/tex] atoms and [tex]1.502\times 10^{23}[/tex] molecules in the compound.
Explanation:
The molar mass of the sulphur is [tex]32.065\,\frac{g}{mol}[/tex]. The Avogradro's Law states that exists [tex]6.022\times 10^{23}\,\frac{atom}{mol}[/tex]. The quantity of atoms in a quantity of mass is derived from dividing the mass by the molar mass and multiplying it by the Avogadro's Number. That is:
[tex]n_{atom} = m_{S}\cdot \frac{n_{A}}{M_{S}}[/tex]
Where:
[tex]m_{S}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S}[/tex] - Molar mass of the sulphur, measured in grams per mole.
If [tex]m_{S} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{atoms}{mol}[/tex] and [tex]M_{S} = 32.065\,\frac{g}{mol}[/tex], then:
[tex]n_{atom} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{atoms}{mol} }{32.065\,\frac{g}{mol} }\right)[/tex]
[tex]n_{atom} = 1.202\times 10^{24}\,atoms[/tex]
There are [tex]1.202\times 10^{24}[/tex] atoms in the compound.
Now, the molecular weight of the compound is:
[tex]M_{S_{8}} = 8\cdot \left(32.065\,\frac{g}{mol} \right)[/tex]
[tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex]
The quantity of molecules in a quantity of mass is derived from dividing the mass by the molecular weight and multiplying it by the Avogadro's Number. That is:
[tex]n_{molecule} = m_{S_{8}}\cdot \frac{n_{A}}{M_{S_{8}}}[/tex]
Where:
[tex]m_{S_{8}}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S_{8}}[/tex] - Molecular weight of the compound (octosulphur), measured in grams per mole.
If [tex]m_{S_{8}} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{molecules}{mol}[/tex] and [tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex], then:
[tex]n_{molecule} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{molecules}{mol} }{256.52\,\frac{g}{mol} }\right)[/tex]
[tex]n_{molecule} = 1.502\times 10^{23}\,molecules[/tex]
There are [tex]1.502\times 10^{23}[/tex] molecules in the compound.
In Act V, scene ii of Romeo and Juliet, what role does Friar John play in the catastrophe?
He creates a quarantine, which impacts Romeo.
He secretly performs Romeo and Juliet's wedding.
He mistakenly tells Balthasar that Juliet is dead.
He fails to deliver an important letter to Romeo.
Answer:
I believe its the 4th one. He goes to give Romeo the message but before he is able to, Balthasar tells Romeo that Juliet is dead. Friar John just wasn't there in time.
Answer:
D) he fails to give Romeo an important letter
Explanation:
i took the test. edge 2020
The density of a gaseous chlorofluorocarbon (CFC) at 23.8 °C and 432 mmHg is 3.23 g/L. What is its molar mass?
Answer:
138.57 g/mol.
Explanation:
The following data were obtained from the question:
Temperature (T) = 23.8 °C
Pressure = 432 mmHg
Density (D) = 3.23 g/L
Next, we shall obtain an expression for the density in relation to molar mass, pressure and temperature.
This can be obtained by using the ideal gas equation as shown below:
PV = nRT.... (1)
Recall:
Mole (n) = maas(m) /Molar mass (M)
n = m/M
Substituting the value of n into equation 1
PV = nRT
PV = mRT/M
Divide both side by P
V = mRT/MP
Divide both side by m
V/m = RT/MP
Invert the above equation
m/V = MP /RT..... (2)
Recall:
Density (D) = mass(m) /volume (V)
D = m/V
Replace m/V with D in equation 2
m/V = MP /RT
D = MP /RT
Thus, with the above formula we can obtain the molar mass of chlorofluorocarbon (CFC) as shown below:
Temperature (T) = 23.8 °C = 23.8 °C + 273 = 296.8 K
Pressure = 432 mmHg = 432/760 = 0.568 atm
Density (D) = 3.23 g/L
Gas constant (R) = 0.0821 atm.L/Kmol
Molar mass (M) =..?
D = MP /RT
3.23 = M x 0.568 / 0.0821 x 296.8
Cross multiply
M x 0.568 = 3.23 x 0.0821 x 296.8
Divide both side by 0.568
M = (3.23 x 0.0821 x 296.8) / 0.568
M = 138.57 g/mol
Therefore the molar mass of CFC is 138.57 g/mol.
How many significant digits will the answer in the following calculations result in?
12.1 - 12.004
Answer:
The answer will result in one significant digit.
Explanation:
1. Subtract:
12.1 - 12.004 = 0.096
2. ROund to the correct number of significant digits:
For addition and subtraction we round the sum or the difference to the least number of digits after the decimal point there are in the problem.
For example, SInce 12.1 has one number after the decimal point and 12.004 has three numbers after the decimal point, we round the answer to one number after the decimal point because 12.1 is the number in the problem which has the least amount of digits after the decimal point.
We round 0.096 to 0.1.
0.1 has one significant digit.
According to the law of conservation of energy, what will most likely happen in a closed system?
O Energy will be exchanged along with matter.
Energy will be exchanged, but matter will not be exchanged.
Energy will be created along with matter.
Energy will be destroyed, but matter will not be destroyed.
Answer:
the answer is Energy will be exchanged, but matter will not be exchanged.
this because that in a closed system energy is able to be transfered but matter cant.
hope this helps
Answer:
b
Explanation:
none
How did this project prepare you to be a real meteorologist?
why is temperature not a chemical change
Answer:
Temperature is not a chemical change because when a substance changes in temperature, its chemical makeup is not changing.
Will knows that the gravitational pull of Mars is less than the gravitational pull of Earth. When he lands on Mars, his mass will be
Answer:
i think it will "Equal to 75 Kg"
Explanation:
object/person remains same, his mass is somewhere, so it would remain same everywhere. Only Weight of a person changes with gravity
hope i helped
-lvr
skeleton equation for
when magnesium oxide reacts with iron, iron(III) oxide and magnesium is formed
Answer:
Magnesium oxide = MgO
Iron = Fe
Iron (III) Oxide = Fe₂O₃
Magnesium = Mg
Skeleton equation = MgO + Fe ⇒ Fe₂O₃ + Mg
what is the name of this compound??
Canthomythisphere
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Please I really really need help!!!!
1) What is Avogadro's number?
2) What is the relationship between Avogadro's number and Carbon atom?
3) What is unified atomic mass unit?
Don't answer the question for points if you don't know what it means, you will be reported!!!!
Thank you if you do :D
Answer:
1) It is the number of particles in one mole of substance. It is an arbitrary definition to denote an amount of substance, not by its weight but by its number of molecules. Why? because that is convenient when doing certain calculations involving molecule formulas.
2) 1 mole of substance contains exactly as many particles as there are atoms in 12 grams of carbon-12.
3) The unified atomic mass unit is 1/12 of the mass of 1 carbon-12 atom.
So you see all three concepts are linked together.
Using the balanced equation below, how many grams of iron(iii) oxide would be required to make 187g iron Fe2O3+3CO = 2Fe+3CO2
Answer:
267.14 iron oxide.
Explanation:
Given that
[tex]Fe_2O_3+3CO = 2Fe+3CO_2[/tex]
We know that molecular mass of iron-oxide = 160 g/mole.
We know that molecular mass of iron = 56 g/mole.
From the above reaction we can say that
1 mole of iron -oxide produce 2 mole of iron
160 gm of iron oxide produce 112 gm of iron
So
1 gm of iron required [tex]\dfrac{160}{112}=1.42 gm[/tex] of iron oxide
Therefore
187 gm of iron required [tex]1.42\times = 187 = 267.14\ gm[/tex] of iron oxide.
Therefore 187 gm of iron required 267.14 iron oxide.
Answer: 267.14
Explanation: