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3 years ago

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What is the molecular formula of a compound that has a molecular mass of 54 and the empirical formula is C2H3

1 answer:

iren [92.7K]3 years ago

8 0

To find the molecular formula from the empirical formula, you need to find a multiple (x) that will give you the molar mass of the compound which in the question is 54 g/mol.

If C₂H₃ is the empirical formula
molar mass of empirical formula = (12 × 2) + (1 × 3) g/mol
= 27 g/mol
let x = multiple
let molecular formula = C₂ₓ H₃ₓ

multiple = molecular mass ÷ empirical mass
= 54 g/mol ÷ 27 g/mol
= 2

If molecular formula = C₂ₓ H₃ₓ

then molecular formula = C₂₍₂₎H₃₍₂₎

= <span>C₄H</span>₆

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