4 mol of a mixture containing one mol each of $L i N O_{3}, M g N O_{3} N a N O 3, C a (N O_{3})_{2}$ is decomposed on strong heating. The total number of moles of $N O_{2} (g)$ evolved is: (assuming complete decomposition of all the salts)

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Solution

$2 L i N O_{3} △ \to L i_{2} O + 2 N O_{2} + \frac{1}{2} O_{2}$
1 mol of $L i N O_{3}$ will produce 1 mole of $N O_{2}$

$2 M g (N O_{3})_{2} △ \to 2 M g O + 4 N O_{2} + O_{2}$
1 mol of Mg $(N O_{3})_{2}$ will produce 2 moles of $N O_{2}$

$2 C a (N O_{3})_{2} △ \to 2 C a O + 4 N O_{2} + O_{2}$
So, 1 mole of $C a (N O_{3})_{2}$ will produce 2 moles of $N O_{2}$

$2 N a N O_{3} △ \to 2 N a N O_{2} + O_{2}$

Hence, total number of moles of $N O_{2}$ produced = 1+2+2 = 5

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Q. 4 mol of a mixture containing one mol each of

L i N O_{3}, M g N O_{3} N a N O 3, C a (N O_{3})_{2}

is decomposed on strong heating. The total number of moles of

N O_{2} (g)

evolved is: (assuming complete decomposition of all the salts)

4 mol

of a mixture containing one mol each of

L i N O_{3}, N a N O_{3}, C a (N O_{3})_{2}

and

M g (N O_{3})_{2}

is decomposed by strongly heating the total number of moles of

N O_{2}

evolved is (assuming complete decomposition of all the salts.)

6

mol of a mixture containing same number of moles 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}

and

A g N O_{3}

, was heated strongly. Total number of moles of

O_{2} (g)

evolved is :

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___