7. 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%
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 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%
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%​