15. Sterling silver contains 95% silver. If a necklace made of sterling silver weighs 15g, what is the mass of silver dissolved in the necklace?
A. 1.6g
B. 6.2g
C. 9.0g
D.14.25g
16. What is the percent by volume of isopropanol in a 90ml solution that contains 25mL isopropanol?
A. 26.8 % isopropanol
B. 26.9 % isopropanol
C. 27.8 % isopropanol
D. 27.9 % isopropanol
17. What is the volume of a 20% methyl solution that contains 15mL of methyl? A. 6 mL of methyl
B. 4 mL of methyl
C. 5 mL of methyl
D. 3mL of methyl
18. What is the percent by mass concentration of a solution that contains 30.0g of sugar dissolved in 150g of water?
A. 16.5%
B. 16.7%
C. 17.6 %
D. 17.7%
19. A genuine sterling silver items is 92.5% silver by mass. This means that:
A. 92.5 g is silver and 7.50 is another metal (usually copper)
B. 0.5 g is silver and 92.5g is another metal (usually copper)
C. 46.25g is silver and 46.25g is another metal (usually copper)
D. 92.5g of the jewelry is made up of pure silver
20. The following are quantitative descriptions of concentrations, EXCEPT: A. Percent by mass
B. Molarity
C. Dilute solution
D. PPM​