Calculate the empirical formula for each of the following compounds:
a. 5.13 g of Cr and 2.37 g of O
b. 2.82 g of K, 0.870 g of C, and 2.31 g of O
c. 61.0% Sn and 39.0% F
d. 25.9% N and 74.1% O
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