Two vessels of capacities 3 litres and 4 litres are separately filled with a gas. The pressures are respectively 202 kPa and 101 kPa. The two vessels are connected. The gas pressure will be now, at constant temperature.

(A) 151.5 kPa                             

(B) 144 kPa

(C) 303 kPa                                 

(D) 175 kPa

B.  Total volume=7 litre. The gas in the 3 litre vessel, after mixing, will have a partial pressure of         37×202 kPa=6067kPa.           Similarly, the 4 litre vessel gas will now have a partial pressure of 47×101 kPa=4047 kPa.           The total pressure=6067+4047=10107                                           =14427144 kPa.

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