A 1 L flask contains 32 g O2 gas at 27°c. What mass of O2 must be released to reduce the pressure in the flask to 12.315 atm?

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8 g

16 g

24 g

0 g

answer is B.

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Detailed Solution

pV=nRT=WmRT ∴ w=pVmRT=12.315×1×320.0821×300=16g ∴O2 to be released =32−16=16g

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