# Chapter 3 - Stoichiometry - Exercises - Page 129: 65

a. $0.9292\text{ mol$Fe_2O_3$}$ b. $2.14*10^{-4}\text{ moles$NO_2$}$ c. $2.5*10^{-8}\text{ moles$BF_3$}$

#### Work Step by Step

a. $150.0\text{ grams$Fe_2O_3$}*\frac{1\text{ mol$Fe_2O_3$}}{159.6882\text{ grams$Fe_2O_3$}}=0.9292\text{ mol$Fe_2O_3$}$ b. $0.0100\text{ grams$NO_2$}*\frac{1\text{ mol$NO_2$}}{46.0055\text{ grams$NO_2$}}=2.14*10^{-4}\text{ moles$NO_2$}$ c. $1.5*10^{-6}\text{ molecules$BF_3$}*\frac{1\text{ mol$BF_3$}}{6.0221*10^{23}\text{ molecules$BF_3$}}=2.5*10^{-8}\text{ moles$BF_3$}$

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