# Chapter 3 - Stoichiometry - Exercises - Page 129: 53

a. $4.5*10^{-3} \text{ mol$P_4O_6$}$ b. $3.2*10^{-3}\text{ mol$Ca_3(PO_4)_2$}$ c. $7.0*10^{-3}\text{ mol$Na_2HPO_4$}$

#### Work Step by Step

a. $1.00 \text{ grams$P_4O_6$}*\frac{1 \text{ mol$P_4O_6$}}{219.89 \text{ grams$P_4O_6$}}=4.5*10^{-3} \text{ mol$P_4O_6$}$ b. $1.00 \text{ grams$Ca_3(PO_4)_2$}*\frac{1 \text{ mol$Ca_3(PO_4)_2$}}{310.17 \text{ grams$Ca_3(PO_4)_2$}}=3.2*10^{-3}\text{ mol$Ca_3(PO_4)_2$}$ c. $1.00 \text{ grams$Na_2HPO_4$}*\frac{1 \text{ mol$Na_2HPO_4$}}{141.96 \text{ grams$Na_2HPO_4$}}=7.0*10^{-3}\text{ mol$Na_2HPO_4$}$

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