# Chapter 3 - Stoichiometry - Exercises - Page 130: 81

a. $NO_2$ b. $CH_2$ c. $P_2O_5$ d. $COH_2$

#### Work Step by Step

a. $N_2O_4\Rightarrow NO_2$ Common factor of 2 b. $C_3H_6\Rightarrow CH_2$ Common factor of 3 c. $P_4O_{10}\Rightarrow P_2O_5$ Common factor of 2 d. $C_6O_6H_{12}\Rightarrow CHO_2$ Common factor of 6

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