Calculate the number of moles present in 24 gm of oxygen gas.
(Atomic mass = $16$ ).

0.25

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0.50

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0.75

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0.80

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Solution

The correct option is A $0.75$
Mass of $O_{2}$ gas $= 24 g m$
Atomic mass $= 16 u$ (Molecular mass $= 32 u$ )
Moles of oxygen gas, $O_{2} = \frac{24}{(16 + 16)} = \frac{24}{32} = 0.75$

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