How much Calcium oxide is formed when 82g of calcium nitrate

Mole Concept (10)

How much Calcium oxide is formed when 82g of calcium nitrate is heated? Also find the volume of nitrogendioxide evolved:

2Ca(NO₃)₂ 2CaO + 4NO₂ + O₂
(Ca = 40, N = 14, O = 16)

Answer

2Ca(NO₃)₂ → 2CaO + 4NO₂ + O₂

1 mole of Ca(NO₃)₂ →1 mole of CaO

i.e. (40+28+96)g (40+16)g

∴ 82g → 82×56/164

i.e. 28 g of CaO.

2 moles of Ca(NO₃)_{2 →} 4 moles of NO₂

i.e. 2 x 164 g → 4 x 22.4 l g NO₂

∴ 82 g → 82×4×22.4/2×164

i.e. 22.4 l g NO₂ at STP

 

• Exam Year: 2016