Question

verify by calculating that 5 moles of CO² and 5 moles of H²O do not have the same mass ​

Answer 1

(a) CO2 has molar mass = 44g  mol–1  5 moles of CO2 have molar mass = 44 × 5 = 220 g  H2O has molar mass = 18 g mol–1  5 moles of H2O have mass         = 18 × 5 g = 90 g  (b) Number of moles in 240g Ca metal  = 240/ 40 = 6  Number of moles in 240g of Mg metal  = 240 /24 = 10  Ratio 6:10   3: 5