Chemistry , Chp.7, Chemical quantities & reactions
How many oxygen atoms are present in 5.20 mol of Al2(SO4)3? a. 62.4 b. 3.76 x 10^25 c. 9.39 x 10^24 d. 3.13 x 10^24
b
The reactants in a chemical reaction are analogous to which of the following? a. a baked cake b. the flour, eggs, chocolate used to bake a cake c. both a and b d. neither a or b
b
Ethanol is produced industrially by the acid catalyzed reaction of ethylene with water. The balanced equation for this reaction is: C2H4(g) + H2O(g)-->C2H5OH(l) if water is present in excess, how many moles of ethanol can be produced from 7.24 mol of ethylene? a. 7.24 b. 14.5 c. 28.0 d. 46.0
a
The balanced equation N2(g) + 2 O2(g) --> 2 NO2(g) means which of the following? a. one mole of nitrogen reacts with two moles of oxygen to form two moles of nitrogen dioxide. b. one gram of nitrogen reacts with two grams of oxygen to form two grams of nitrogen dioxide. c. the equation means both a and b d. the equation means neither a and b
a
Which of the following is the correct unit for formula weight? a. atomic mass units b. grams c. ounces d. pounds
a
Which of the following is true regarding mass relationship in a chemical reaction? a. to determine mass relationship in a chemical reaction, you first need to know the balanced chemical equation for the reaction. b. to convert from grams to moles and vice versa, you need to use Avogadro's number as a conversion factor. c. both a and b are true d. both a and b false
a
in the industrial synthesis of acetic acid, methanol is reacted with carbon monoxide. the balanced equation for this reaction is: CH3OH(g) + CO(g)--> CH3COOH(l) how many grams of CO(g) are required to produce 49.4 g of acetic acid? a. 23.0 g b. 28.0 g c. 60.1 g d. 88.1 g
a
A typical deposit of cholesterol, C27H46O, in an artery has a mass of 3.90 mg. How many molecules of cholesterol are present in this deposit? a. 6.07 x 10^21 b. 6.07 x 10^18 c. 0.00390 d. 1.65 x 10^-22
b
For the reaction N2(g) + 3 H2(g)--> 2 NH3(g) which of the following can be determined using only the coefficients of the balanced chemical equation? a. the number of molecules of NH3 obtained if 4.2 mol of N2 react completely to form NH3 b. the number of moles of NH3 obtained if 4.2 mol of N2 react completely to form NH3 c. both a and b d. neither a or b
b
Given the reaction 2 HgO(s)-->2 Hg(l) + O2(g). what weight of elemental mercury will be obtained by the decomposition of 0.125 mol of HgO? a. 13.5 g b. 25.0 g c. 27.0 g d. 50.0 g
b
How many moles of hydrogen atoms are there in 2.50 mol of C6H12O6? a. 2.50 b. 30.0 c. 1.51 x 10^24 d. 1.81 x 10^25
b
In the industrial synthesis of acidic aside, methanol is reacted with carbon monoxide. the balanced equation for this reaction is : CH3OH(g) + CO(g) --> CH3COOH(l) If ethanol is present in excess, how many moles of CO(g) are required to produce 16.6 moles of acetic acid? a. 8.30 b. 16.6 c. 28.0 d. 33.2
b
O2 can be produced by the reaction 2 KClO3(s)--> 2 KCl(s) + 3 O2(g). in one experiment 0.312 g of O2 was formed. how much KClO3 was decomposed? a. 0.484 g b. 0.797 g c. 1.19 g d. 1.79 g
b
The balance equation 3 H2(g) + N2(g) -->2 NH3(g) means which of the following? a. Three grams of hydrogen react with one gram of nitrogen to from two grams of ammonia. b. Three moles of hydrogen react with one mole of nitrogen to form two moles of ammonia. c. The equation means both a and b d. The equation means neither a or b
b
The mass of an atom of ^12C is exactly 12 atomic mass units. Which of the following describes a mole of ^12C atoms? a. a sample which weighs exactly 12 atomic mass units b. a sample which contains 6.02 x 10^23 atoms of ^12C c. both a and b d. neither a or b
b
When solutions of AgNO3 and NaCl react, the balanced molecular equation is : AgNO3(aq) + NaCl(aq)-->AgCl(s) + NaNO3(aq) how much AgCl is produced when 3.10 g of AgNO3 and 3.10 g of NaCl react? a. 1.55 g b. 2.62 g c. 4.17 g d. 6.20 g
b
Which of the following is the correct set of integer coefficients for the balanced equation respectively: ___C5H12(g) + ___O2(g)-->___CO2(g) + ___H2O(g) a. 1, 5, 5, 6 b. 1, 8, 5, 6 c. 5, 1, 8, 6 d. 5, 12, 2, 4
b
Which of the following is the correct set of integer coefficients for the balanced equation, respectively: ___C3H8(g) + ___O2(g)--> ___CO2(g) + ___H2O(g) a. 3, 8, 1, 2 b. 1, 5, 3, 4 c. 1, 5, 4, 3 d. 4, 3, 2, 1
b
Which of the following is true of a balanced chemical equation? a. in a balance chemical equation, number of molecules on the reactant side equals the number molecules on the product side. b. In a balanced chemical equation, the number of atoms on the reactant side equals the number of atoms on the product side. c. both a and b are true d. both a and b are false
b
Which of the following is true of a chemical reaction? a. In a chemical reaction, the number of moles of product always equal the number of moles of reactants. b. In a chemical reaction, the mass of the products always equal the mass of the starting materials that have reacted. c. both a and b are true d. both a and b are false
b
what is the molar mass of water H2O? a. 17.01 g b. 18.02 g c. 17.01 amu d. 18.02 amu
b
A person drinks 1.50 x 10^3 g of water, H2O, per day. How many moles is this ? a. 0.0120 b. 8.33 c. 83.3 d. 1.20 x 10^2
c
A serving of a particular fruit dessert contains 20.0 g of sugar. If all the sugar is sucrose, C12H22O11, how many molecules of sugar are present in this serving? a. 0.0584 b. 17.1 c. 3.52 x 10^22 d. 1.03 x 10^25
c
Diethyl ether can be made from ethanol. the reaction is: 2 C2H5OH(l)-->(C2H5)2O(l) + H2O(l) in one experiment 46.0 g of ethanol yielded 34.7g of diethyl ether. what was the percent yield in this experiment? a. 62.1% b. 80.4% c. 93. 8% d. 97.0%
c
Ethanol is produced industrially by the acid catalyzed reaction of ethylene with water. the balanced equation for this reaction is: C2H4(g) + H2O(g)-->C2H5OH(l) if water is present in excess, how many grams of ethanol can be produced from 42.7 g of ethylene? a. 42.7 g b. 46.1 g c. 70.1 g d. 92.2 g
c
Given the reaction 2 HgO(s)--> 2 Hg(l) + O2(g). what weight of elemental mercury will be obtained by the decomposition of 94.5 g of HgO? a. 43.8 g b. 78.5 g c. 87.5 g d. 175 g
c
How many moles of marble, CaCO3 are there in a 275 g piece of marble? a. 4.57 x 10^-22 b. 0.364 c. 2.75 d. 275
c
In a particular experiment to prepare a compound, the theoretical yield is 34.7 g. If the actual yield is 31.2 g, what is the percent yield? a. 0.899% b. 11.1 % c. 89.9% d. 93.0%
c
In an experiment to prepare aspirin, the percent yield was 94.3% g. Ig the actual yield was 124.3 g, what was the theoretical yield for this experiment? a. 94.3 g b. 117 g c. 132 g d. 234 g
c
In the industrial synthesis of acetic acid, methanol is reacted with carbon monoxide. the balanced equation for this reaction is: CH3OH(g) + CO(g)-->CH3COOH(l) how many grams of CO(g) are required to produce 16.6 mol of acetic acid? a. 16.6 g b. 33.2 g c. 465 g d. 996 g
c
Sodium sulfite, Na2SO3(aq), is added to wine as an antioxidant since it reacts with the oxygen of the air to form sodium sulfate, Na2SO4(aq). Which of the following is the balance equation for this reaction? a. Na2SO3(aq) + O(g) -->Na2SO4(aq) b. Na2SO3(aq) + 2 O(g) --> Na2SO4(aq) c. 2 Na2SO3(aq) + O2(g)--> 2 Na2SO4(aq) d. Na2SO3(aq) + O2(g)--> Na2SO4(aq)
c
what is the molar mass of glucose, C6H12O6? a. 60.05 amu b. 180.2 amu c. 60.05 g d. 180.2 g
d
You have a sample of 3.01 x 10^23 atoms of silver. How much does this sample weigh? a. 0.0500 g b. 2.00 g c. 53.9 g d. 107.9 g
c
Ethanol is produced industrially by the acid catalyzed reaction of ethylene with water. the balanced equation for this reaction is: C2H4(g) + H2O(g)-->C2H5OH(l) if water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene? a. 7.24 g b. 14.5 g c. 203 g d. 334 g
d
How many does a sample of 5.75 mol diethyl ether, C4H10O, weigh? a. 5.75 g b. 12.9 g c. 74.1 d.426
d
How many hydrogen atoms are there in 2.50 mol of C6H12O6? a. 2.50 b. 12.0 c. 1.51 x 10^24 d. 1.81 x 10^25
d
How many molecules are present in one mole of water, H2O? a. 1.66 x 10^-24 b. 3.00 x 10^-23 c. 3.24 x 10^23 d. 6.02 x 10^23
d
If you need a sample of 2.84 mol of Na2S, how many grams do you need? a. 0.00451 g b. 2.84 g c. 78.1 g d. 222 g
d
Which of the following is the correct set of integer coefficients for the balanced equation, respectively: ___C6H14(g) + ___O2(g)-->___CO2(g) + H2O(g) a. 1, 1, 1, 1 b. 1, 3, 6, 7 c. 1, 9.5, 6, 7 d. 2, 19, 12, 14
d
Which of the following is the correct set of integer coefficients for the balanced equation, respectively: ____CO2(g)+___H2O(l)-->___C6H12O6(aq)+___O2(g) a. 1, 1, 1, 1 b. 3, 3, 6, 6 c. 6, 3, 3, 6 d. 6, 6, 1, 6
d
You have a sample of 1.204 x 10^24 atoms of gold. How much does this sample weigh? a. 2.00 g b. 98.5 g c. 197.0 g d. 394.0 g
d
