The atomic weight of an element is 'a'. If this element occurs in nature as a triatomic gas, then the correct formula for the number of moles of gas in its 'w' g is?

\frac{3 w}{a}

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\frac{w}{3 a}

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3 w a

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\frac{a}{3 w}

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Solution

The correct option is B $\frac{w}{3 a}$
Atomic weight of an element = a
Triatomic gas means there are three atoms in one molecule.
Thus, molecular weight = 3 times atomic weight = 3a
Number of moles of gas in 'w' g is = $\frac{w}{m o l e c u l a r w e i g h t} = \frac{w}{3 a}$

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