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A gas expands from 1.5 L to 6.5 L against a constant pressure of 0.5 atm and during this process the gas also absorbs 100 J of heat. The change in the internal energy of the gas is

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153.3 J

353.3 J

- 153.3 J

- 353.3 J

answer is C.

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Detailed Solution

$Δ U = q + w = 100 J - (0.5 atm) (6.5 L - 1.5 L) = 100 J - (2.5 atmL) (\frac{8.314 J}{0.082 atmL}) = - 153.3 J$

Thus Option C is correct.

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