Question

If 16.4 g of calcium nitrate is heated : 

(a) Calculate the volume of Nitrogen dioxide obtained at STP and 

(b) The mass of calcium oxide obtained.

Answer 1

Balanced equation is 

a) 328 g calcium nitrate liberates 4 x 22.4 litres of NO₂   [ \(\because\)4 moles of NO₂ is formed ]

The amount of NO₂ liberated from 16.4 g of calcium nitrate (4 x 22.4 x16.4)/328= 4.48 litres .

b) 328 g of calcium nitrate gives 112 g of CaO.

The amount of CaO obtained from 16.4 g of calcium nitrate = (112 x 16.4)/328 = 5.6 g.