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ICSE Class 10 Chemistry Question 12 of 72

Mole Concept & Stoichiometry Miscellaneous Exercises — Question 12

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Question

Question 12

How much calcium oxide is obtained by heating 82 g of calcium nitrate? Also find the volume of NO2 evolved:

2Ca(NO3)2 ⟶ 2CaO + 4NO2 + O2

Answer

2Ca(NO3)2⟶2CaO+ 4NO2 +O22[40+2[14+3(16)]]2[40+16]=2[40+28+96]=2(56)=328 g=112 g\begin{matrix} 2\text{Ca(NO}_3)_2 & \longrightarrow & 2\text{CaO} & + &\space 4\text{NO}_2 \space + & \text{O}_2 \\ 2[40 + 2[14 + 3(16)]] & & 2[40 + 16] \\ = 2[40 + 28 + 96] & & = 2(56) \\ = 328 \text{ g} & & = 112 \text{ g} \end{matrix}

328 g of calcium nitrate produces 112 g of CaO

∴ 82 g of calcium nitrate will produce 112328\dfrac{112}{328} x 82

= 28 g of CaO

328 g of calcium nitrate produces 4 x 22.4 L of NO2

∴ 82 g of calcium nitrate will produce 4×22.4328\dfrac{4 \times 22.4}{328} x 82

= 22.4 L of NO2