Acetylene is used in oxyacetylene gas welding. Calculate the empirical formula for acetylene given its percent composition: 92.25% C and 7.75% H.

Explanation:

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In this case, given the percent composition of C and H in acetylene, in order to find its empirical formula we compute moles of C and H assuming those percentages as masses:

Next, since they have the same number of moles we infer they are in a 1:1 subscript ratio on the empirical formula, where is therefore:

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first one is the correct answer

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