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Mole Concept

If the ratio ...

Question

If the ratio of number of molecules contained in $1$ g of $N H_{3}$ and $1$ g of $N_{2}$ is x:y, then value of x+y is :

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Solution

Number of moles= $\frac{m a s s i n g r a m}{M o l a r M a s s}$
Number of moles= $\frac{N u m b e r o f p a r t i c l e}{N_{A}}$
Moles of ammonia= $\frac{1}{17}$
Number of molecules of ammonia= $\frac{N_{A}}{17}$
Moles of nitrogen= $\frac{1}{28}$
Number of molecules of nitrogen= $\frac{N_{A}}{28}$
Ratio of molecules = $\frac{28}{17}$ = $\frac{X}{Y}$
X+Y= $28 + 17$ =45

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