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ICSE Class 10 Chemistry Question 18 of 28

Stoichiometry — Percentage Composition — Empirical & Molecular Formula — Chemical Equations — Question 26

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Question

Question 1(2016)

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]

Answer

2Ca(NO3)2⟶2CaO+4NO2+O22[(40)+2(404[22.4]2(14+3(16))]+16) lit.=328 g112g\begin{matrix} 2\text{Ca}(\text{NO}_3)_2 & \longrightarrow & 2\text{CaO} & + & 4\text{NO}_2 & + & \text{O}_2 \\ 2[(40) + & & 2(40 & & 4[22.4] \\ 2(14 +3(16))] & & + 16) & & \text{ lit.} \\ = 328 \text{ g} & & 112 \text{g} \\ \end{matrix}

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

∴ 82 g of Ca(NO3)2 will produce = 112328\dfrac{112}{328} x 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 = 4×22.4328\dfrac{4 \times 22.4}{328} x 82 = 22.4 lit.

Hence, vol of nitrogen dioxide evolved = 22.4 lit.