• # question_answer 54)   The empirical formula and molecular mass of a compound are $C{{H}_{2}}O$ and 180 g respectively. What will be the molecular formula of the compound? (a) ${{C}_{9}}{{H}_{18}}{{O}_{9}}$                          (b) $C{{H}_{2}}O$ (c) ${{C}_{6}}{{H}_{12}}{{O}_{6}}$                          (d) ${{C}_{6}}{{H}_{4}}{{O}_{2}}$

(c) Molecular formula = ${{(C{{H}_{2}}O)}_{n}}$ $n=\frac{\text{Molecular mass}}{\text{Empirical formula mass }\!\!~\!\!\text{ }}=\frac{180}{30}=6$ $\therefore$ Molecular formula = ${{(C{{H}_{2}}O)}_{6}}={{C}_{6}}{{H}_{12}}{{O}_{6}}$