(Solution Document) What is the molar mass of copper(II) sulfate, CuSO4?


  1. What is the molar mass of copper(II) sulfate, CuSO4?

319.17 g

159.62 g

63.55.g

16.00 g

111.55 g

 


2. 1.00 mol of neon has a mass of __________.

1.00 g

10.0 g

30.2 g

14.0 g

20.2 g

 


3. What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid?

214.3 g

71.32 g

262.9 g

118.3 g

150.3 g

 


4. How many moles of K2SO4 are in 15.0 g of K2SO4?

0.0861 mol

2.61 × 103 mol

0.119 mol

0.172 mol

0.111 mol

 


5. How many grams of Fe2O3 are there in 0.500 mol of Fe2O3?

63.8 g

160. g

35.9 g

79.9 g

51.9 g

 


6. What is the mass of 0.00100 mol of caffeine, C8H10N4O2?

87.0 g

0.870 g

1.94 g

194 g

0.194 g

 


7. Calculate the number of moles of MgO produced when 0.200 mol of O2 reacts completely according to the equation: 2 Mg + O2 ? 2 MgO

0.100 mol

0.200 mol

0.600 mol

0.800 mol

0.400 mol

 


8. When 2.00 mol of H2O react, how many grams of NH3 are produced? Use the following balanced equation: 

Mg3N2 + 6 H2O ? 3 Mg(OH)2 + 2 NH3

10.0 g

34.0 g

102 g

11.4 g

5.67 g

 


9. How many grams of hydrogen gas, H2, are needed to produce 1.80 g of water according to this equation?

2 H2 + O2 ? 2 H2O


0.180 g

0.100 g

0.201 g

2.01 g

4.02 g

 


10. How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg? Use the following equation: 2 Mg + O2 ? 2 MgO

60.8 g

201 g

50.4 g

101 g

30.4 g

 


11. What is the limiting reactant for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2?

Reaction: 2 HCl + Ca(OH)2 ? 2 H2O+ CaCl2

HCl

H2O

CaCl2

Ca(OH)2

not enough information

 


12. How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Another way to word this is to calculate the theoretical yield in moles. Remember moles to moles is a one step calculation (no mass needed).

Reaction: 2 HCl + Ca(OH)2 ? 2 H2O+ CaCl2

0.7

1.3

1.4

1.0

not enough information

 


13. How many grams of aluminum oxide are produced according to the reaction below given that you start with 10.0 g of Al and 19.0 grams of O2? (What is the theoretical yield of Al2O3 in grams?)

Reaction: 4 Al + 3 O2 ? 2 Al2O3

0.185

5.00

40.4

18.9

not enough information

 


14. Magnesium sulfate reacts with barium chloride according to the following balanced equation. If 1.20 g of magnesium sulfate is allowed to react with 10.0 g of barium chloride in a water solution, what is the theoretical yield of barium sulfate?


MgSO4 + BaCl2 ? BaSO4 + MgCl2 


2.08 g

23.3 g

10.0 g

1.20 g

2.33 g

 


15. Magnesium sulfate reacts with barium chloride according to the following balanced equation. If 1.20 g of magnesium sulfate is allowed to react with 10.0 g of barium chloride in a water solution, and at the end of the experiment, 1.96 g of BaSO4 is obtained what is the percent yield of barium sulfate?


MgSO4 + BaCl2 ? BaSO4 + MgCl2 


84.1 %

12.0%

19.6 %

23.3 %

61.2 %

 


16. A 3.82 g sample of magnesium nitride is reacted with 7.73 g of water, according to the balanced equation below: 

Mg3N2 + 3H2O ? 2NH3 + 3MgO


After the reaction was finished and the yield of MgO was weighed out, 3.60 g of MgO was the reported yield.. What is the percent yield in the reaction?

49.4 %

94.5 %

78.8 %

46.6 %

99.9 %

 







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