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Question

N2 is found in a litre flask under 100kPa pressure and O2 is found in another 3 litre flask under 320 kPa pressure. If the two flasks are connected, the resultant pressures is


A

310 kPa

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B

210 kPa

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C

420 kPa

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D

365 kPa

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E

265 kPa

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Solution

The correct option is E

265 kPa


The key idea is that total number of moles are the same initially and finally. Also, the temperature remains constant.
Hence, PV = constant.
Total volume = 4 litres.
Total pressure = RTV=(100+960)4=265 kPa


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