# Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95e: 85

a) $C_2H_2$ b) $C_4H_4O_4$ c) $CH_2$, $112.21\ g/mol$

#### Work Step by Step

a) Empirical formula's molar mass: $M_u=13.02\ g/mol$ $M/M_u=2.0$, empirical formula: $CH$ Molecular formula: $C_2H_2$ b) Empirical formula's molar mass: $M_u=29.02\ g/mol$ $M/M_u=4.0$, empirical formula: $CHO$ Molecular formula: $C_4H_4O_4$ c) From the molecular formula: empirical formula $CH_2$ (8 units) Molar mass: $112.21\ g/mol$

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