Question

How much calcium oxide is formed when 82 g. of calcium nitrate is heated. Also find the volume of nitrogen dioxide evolved :
2Ca(NO3)2 ⟶ 2CaO + 4NO2 + O2
[Ca = 40, N = 14, O = 16]

  • Percentage Composition
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Answer

2Ca(NO3)2 ⟶ 2CaO + 4NO2 + O2

328 g               112 g     89.6 lit

(i) 328 g of Ca(NO3)2 produces 112 g of calcium oxide.

∴ 82 g of Ca(NO3)2 will produce = 112\over 328 × 82 = 27.99 g = 28 g

Hence, 28 g of calcium oxide is produced.

(ii) 328 g of Ca(NO3)2 produces 4(22.4) lit of nitrogen dioxide.

∴ 82 g of Ca(NO3)2 will produce = 4 × 22.4\over 328 × 82

= 22.4 lit.

Hence, vol of nitrogen dioxide evolved = 22.4 lit.

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