Acompound is composed of 85.64% carbon and 14.36% hydrogen. the compound has a formula mass of 42.08 grams. what is the molecular formula?

Explanation:

1) Assume 100 g of substace:

2) Convert the masses in grams to number of moles

Calculations:

3) State the ratio of moles.

Divide the number of moles of each element by the least number of moles:

4) Set the empirical formula:

5) Calculate the mass of one mol of the empirical formula:

6) Calculate how many times the mass of the empirical formula is contained in the mass of the molecular formula:

7) Set the molecular formula:

Multiply each subscript of the empirical formula by the previos ratio: 3

Conclusion: the molecular formula is C₃H₆

C₃H₆

Explanation:

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