Determine the empirical formulas of the compounds with the following compositions by mass: a) 55.3%K,14.6%P, and 30.1%O b) 24.5%Na,14.9%Si, and 60.6%F c) 62.1%C,5.21%H,12.1%N, and the remainder O (Mw: K=39,P=31,O=16,Na=23,Si=28,F=19,C=12,H=1, and N=14g/mol )