19. What is the % M/M if 10.0g of copper is added to enough zinc to produce 110g of an alloy? A. 9.05%6 B. 9.09% C. 9.10% D. 10.00% 20. 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%
