The weight is required to get 2.24 litre of oxygen at STP is :

3.2 grams

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32 grams

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6.4 grams

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64 grams

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Solution

The correct option is B 3.2 grams
To find, mass required to get 2.24 litre of oxygen at STP.
Now,
Molar volume at STP $= 22.4 L / m o l$
Molar mass of oxygen $= 32 g / m o l$
$∴$ Mass in 2.24 L of oxygen $= \frac{32 g / m o l}{22.4 L / m o l} \times 2.24 L = 3.2 g$

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