1.What is the total mass of a mixture of 2.1 x 1023 formula units of K2SO4, 0.820 mol of carbon dioxide, and 4.53 g of NaCl?

2.A compound has the following percent composition: 41.8% C, 2.3% H, and 55.9% O. If its gram molecular mass is 86.0 g/mol, what is its molecular formula? Show calculations.

3.Percent Composition: a. Calculate the percent composition of butane, C4H10. Then, calculate the amount of hydrogen in 450g of C4H10. b. Calculate the percent composition of sodium bisulfate, NaHSO4. Then, calculate the amount of hydrogen in 32.8g of NaHSO4

4.Calculate the percent composition of the compounds that are formed from these reactions: a. 85.05 g of Mg combines completely with 112.21 g of S. b. 19.55 g of K combines completely with 39.95 g of Br.