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Chemistry · May / June 2021 · Paper 11 · Question 9

5070Formulae

The empirical formula of compound X is CH$_2$ and the relative molecular mass, $M_r$, of X is 70. What is the molecular formula of X?

  1. ACH$_2$
  2. BC$_2$H$_4$
  3. CC$_5$H$_{10}$
  4. DC$_n$H$_{2n}$

As printed in the paper

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Correct answer: C. C$_5$H$_{10}$

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