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How much calcium oxide is formed when 82...

How much calcium oxide is formed when 82 g of calcium nitrate is heated ? Also find the volume of nitrogen dioxide evolved :
`2Ca(NO_3)_2 rarr 2CaO + 4NO_2 + O_2`
(Ca = 40, N = 14, O = 16)

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`(i) 28 g " " (ii) 42.6% NaSO_(4)`
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