Chapter 6 - Chemical Composition - Exercises - Problems - Page 197: 29

a) 0.02 mol of Zn b) 0.62 mol of Ar c) 0.4 mol of Ta d) 0.0037 mol of Li

Number of mole = $\frac{mass}{molar mass}$ a) Number of mole = $\frac{mass}{molar mass} = \frac{1.34 g}{65.4 g/mol} = 0.02$ mol of Zn b) Number of mole = $\frac{mass}{molar mass} = \frac{24.9 g}{40 g/mol} = 0.62$ mol of Ar c) Number of mole = $\frac{mass}{molar mass} = \frac{72.5 g}{181 g/mol} = 0.4$ mol of Ta d) Number of mole = $\frac{mass}{molar mass} = \frac{0.0223 g}{6 g/mol} = 0.0037$ mol of Li