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Verify by calculating that 

(a) 5 moles of CO2 and 5 moles of H2O do not have the same mass. 

(b) 240 g of calcium and 240 g magnesium elements have a mole ratio of 3:5.

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1 Answers

(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

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