Question

1) a compound with a formula weight of 630, consists of 32.79% sodium , 13.02% Al, and the rest flourine. what is the empirical and molecular formula

2) a compund weighing 5.325 g with a formula weight of 408 consists of 3.758 g carbon, 0.316 g hydrogen, and the rest oxygen, determine the empircal and molecular formula.

3) a compound with a formula weight of 62.1 consists of 9.7% hydrogen, 51.6% oxygen and the rest catbon, what is the empirical and molecular formula

4) how many calcim atoms are in 0.154 grams of calcium phosphate