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Empirical and Molecular Formula Help

Hi, I've been given a question on formulas as a homework task and I think I have the answer but we haven't covered this type of question yet in class so I could do with someone checking it for me please.

The question is:
A substance contains carbon, hydrogen, and oxygen. Its relative molecular mass is 85. When burnt, 0.43 grams of the substance produces 1.10 grams of carbon dioxide and 0.45 grams of water. (a) Find the empirical formula and (b) the molecular formula.

My answer for both is C₅H₁₀O

Here's my working:

Spoiler



Thanks for any input :biggrin:

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