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16 March, 00:58

A gas with an empirical formula C2H2O has a molecular weight of 120.6g/mol. A possible molecular formula for the gas is

A) CH2O

B) C2H2O

C) C3H6O1.5

D) C6H6O3

E) C4H4O2

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Answers (1)
  1. 16 March, 04:49
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    M (C2H2O) = 12.0*2 + 1.0*2 + 16.0 = 42 g/mol is a molar mass for empirical formula.

    120.6g/mol/42g/mol ≈ 3

    So, empirical formula should be increased 3 times,

    and molecular formula is C6H6O3.

    Answer is D.
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