1. How many grams 9f glucose are needed to prepare 400mL of 5% glucose solution?
A. B. 10g C. 14 D. 20g

2. What is the percentage concentration in the following solution given 2g surcrose in 80g water?
A. 2.4%
B. 2.5%
C. 4.0%
D. 97.6%

3. 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. 9.0% D. 14.25%

4. what is the percent by mass concentration of a solution that contains 6.0.g of sugar dissolved in 20.7g of water?
A. 21.21% B. 22.21% C. 22.47% D. 22.74%

5. 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 2.7g of zinc, what is the % by mass of zinc in brass?
A. 4.7% B. 4.8% C. 4.9% D. 10%

6.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%
A. 39.5mL of benzene
B.40.5mL of benzene
C. 41.5mL of benzene
D. 42.5mL of benzene

7. A solution is prepared by mixing a 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%

8. 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

9. You bought an 18 karat ring which contains 18g of gold. what is the % by the mass of gold in a ring?
A. 65%
B. 75%
C. 85%
D. 95%

10. 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%​