16. How many grams of glucose are needed to prepare 400mL of 5% glucose solution?
a. 5g
b.10g
c. 14g
d.20g

17. What is the percentage concentration in the following solution given 2g sucrose in 80g water?
a. 2.4%
b. 2.5%
c. 4.0%
d. 97.6%

18. Sterling silver contains 95% silver. If a necklace made of sterling silver weighs 15g, what is the mass of the silver dissolved in the necklace?
a. 1.6g
b. 6.2g
c. 9.0g
d. 14.25g

19. What is the percent by mass concentration of a solution that contains 6.0g of sugar dissolved in 20.7g of water?
a. 21.21%
b. 22.21%
c. 22.47%
d. 22.74%

20. Brass is a copper- zinc alloy. If the concentration of zinc is relatively low, the brass has a golden color and is often used for inexpensive jewelry. If a 35.0g pendant contains 1.7g of zinc, what is the % by mass of zinc in brass?
a. 4.7%
b. 4.8%
c. 4.9%
d. 10%

21.A solution of benzene and toluene was prepared by adding toluene to benzene until the total volume becomes 135mL. By volume, the solution is 30.0% benzene. How much benzene, in mL, is in the solution?
a. 39.5mL of benzene
b. 40.5mL of benzene
c. 41.5mL of benzene
d. 42.5mL of benzene

22. A solution is prepared by mixing a 20g of sodium chloride in 80g of water. What are the concentrations of the solute and solvent in % by mass?
a. Solute: 10%; Solvent: 90%
b.. Solute: 20%; Solvent: 80%
c. Solute: 30% ; Solvent: 70%
d. Solute: 40% ; Solvent: 60%

23.What is the volume of a 25% methyl solution that contains 20mL of methyl? a. 6.25mL
b. 7.25mL
c. 8.25mL
d. 9.25mL

24. You bought an 18 karats ring which contains 18g of gold. What is the % by mass of gold in a ring?
a. 65%
b. 75%
c. 85%
d. 95%

25. What is the % M/M if 10.0g of copper is added to enough zinc to produce 110g of an alloy?
a. 9.05%
b. 9.09%
c. 9.10%
d. 10.00%

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