2. NaHCO3 is the active ingredient in baking soda. How many grams of oxygen are in 0.35 g of NaHCO3 ? a) 0.012 g b) 0.022 g c) 0.067 g d) 0.20 g
2. NaHCO3
is the active ingredient in baking soda. How many grams of oxygen are in 0.35 g of
NaHCO3
?
a) 0.012 g
b) 0.022 g
c) 0.067 g
d) 0.20 g
3. Suppose the reaction Ca3
(PO4)2 + 3H2SO4 → 3CaSO4 + 2H3PO4
is carried out starting with
103g of Ca3 (PO4)2 and 75.0 g of H2SO4. How much phosphoric acid will be produced?
a) 74.9 g
b) 50.0 g
c) 112 g
d) 32.5g
4. When 125.0 g of ethylene (C2H4) burns in oxygen to give carbon dioxide and water, how many grams of CO2are formed?
a) 392.2 g
b) 250.0 g
c) 57.50 g
d) 425.6 g
5. Consider the following reaction:
CH4
(g) + 4Cl2
(g) → CCl4
(g) + 4HCl(g)
What mass of CCl4 will be formed if 1.20 moles of methane react with 1.60 moles of chlorine?
a) 229 g
b) 171 g
c) 114 g
d) 61.5 g
6. The Claus reactions, shown below, are used to generate elemental sulfur from hydrogen sulfide.
2H2S + 3O2 → 2SO2 + 2H2O
SO2 + 2H2S →3S + 2H2O
How much sulfur (in grams) is produced from 48.0 grams of O2
? HINT: solve for moles of SO2 in the
first equation and use those moles of SO2 as the initial moles SO2 in the second equation to find S.
a) 16.0 g
b) 32.1 g
c) 48.1 g
d) 96.2 g
7. How many grams of NaCl are contained in 350. mL of a 0.250 M solution of sodium chloride?
a) 41.7 g
b) 5.11 g
c) 14.6 g
d) 87.5 g
8. What mass of calcium chloride, CaCl2, is needed to prepare 2.850 L of a 1.56 M solution?
a) 25.9 g
b) 60.8 g
c) 111 g
d) 493 g
9. A 54.8 g sample of SrCl2 is dissolved in 112.5 mL of solution. Calculate the molarity of this solution.
a) 0.346 M
b) 3.07 M
c) 3.96 M
d) 8.89 M
10. What mass of NaOH is required to react exactly with 25.0 mL of 1.2 M H2SO4
?
a) 1.2 g
b) 1.8 g
c) 2.4 g
d) 3.5 g
11. Consider the reaction between 15.0 mL of a 1.00 M aqueous solution of AgNO3 and 10.0 mL of a 1.00
M aqueous solution of K2CrO4. When these react, a precipitate is observed.
What is present in solution after the reaction is complete? Note: the solid is not considered to be in
solution.
a) Ag+, NO3-, K+, CrO42-, water
b) Ag+, NO3-, K+,water
c) K+, CrO42-, water
d) NO3-, K+, CrO42-, water
12. With what volume of 5.0 M HF will 7.4 g of calcium hydroxide react completely, according to the
reaction 2HF + Ca(OH)2 → CaF2 + 2H2O?
a) 20. mL
b) 50. mL
c) 30. mL
d) 40. mL
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