As the ratio of the molecular formula to the empirical formula is always a whole number

CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance

Problem

As the ratio of the molecular formula to the empirical formula is always a whole number, the molecular formula can also be calculated from the empirical formula if the molar mass is known. Deduce the molecular formula of the following substances: (1) Empirical formula P2O5P_2O_5 and a molar mass of 283.88 g mol−1283.88 \text{ g mol}^{-1} (2) Empirical formula CH2CH_2 and a molar mass of 70.15 g mol−170.15 \text{ g mol}^{-1} (3) Empirical formula CH2OCH_2O and a molar mass of 60.06 g mol−160.06 \text{ g mol}^{-1}

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