Determine the molecular formula for each compound.

a. 94.1% O and 5.9% H; molar mass =34 g/mol

b. 50.7% C, 4.2% H, and 45.1% O; molar mass = 142 g/mol

c. 56.6% K, 8.7% C, and 34.7% O; molar mass = 138.2 g/mol