An expandable container has 1.5 moles of a gas at STP. Its
current volume is 345 mL. How many moles of gas **should
be added** in the same container to increase the volume
by 500. mL without changing the temperature and pressure?

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soluw: Since we know that, n= no. of moles:' Pressure & Temp. not Change, soV=n((RT)/(P))rarr" constant "s0_(1)quad vv prop wSo,(v_(1))/(n_(1))=(v_(2))/(n_(2)) ... See the full answer