Question 1
A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?
◦ 2.27 g
◦ 7.70 g
◦ 15.0 g
◦ 20.5 g
Question 2
A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample?
◦ 5.05%
◦ 10.1%
◦ 20.2%
◦ 40.4%