## Chemistry (7th Edition)

Number of moles = Mass in grams/ Molar mass. a) Mass in grams = 11.51 g Molar mass = 47.867 g/mol Number of moles = $\frac{11.51g}{47.867g/mol}$ = 0.2405 mol. b) Mass in grams = 29.127 g Molar mass of Na = 22.99 g/mol Number of moles of Na = $\frac{29.127g}{22.99g/mol}$ = 1.267 mol c) Number of moles = $\frac{1477g}{238.029 g/mol}$ = 6.205 mol.