4 mol of a mixture containing same number of moles each of $N a N O_{3}, N H_{4} N O_{3}, L i N O_{3}, C a (N O_{3})_{2}, P b (N O_{3})_{2}, A g N O_{3}, H g_{2} (N O_{3})_{2} a n d Z n (N O_{3})_{2}$ was heated strongly. Total number of moles of $N O_{2 (g)}$ evolved is___

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Solution

4 moles (8 compounds each of equal moles)

0.5 mole of $N a N O_{3} \to N a N O_{2} + \frac{1}{2} O_{2}$
0.5 mole of $N H_{4} N O_{3} \to N_{2} O + H_{2} O$
0.5 mole of $L i N O_{3} \to 0.5 m o l e N O_{2}$
0.5 mole of $C a (N O_{3})_{2} \to 1 m o l e N O_{2}$
0.5 mole of $P b (N O_{3})_{2} \to 1 m o l e N O_{2}$
0.5 mole of $A g N O_{3} \to 0.5 m o l e N O_{2}$
0.5 mole of $H g (N O_{3})_{2} \to 1 m o l e N O_{2}$
0.5 mole of $Z n (N O_{3})_{2} \to 1 m o l e N O_{2}$
$\Rightarrow 5 m o l e s N O_{2}$

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