The stop-cock connecting the two bulbs of 5dm3 and 10dm3 contains an ideal gas at 10 bar and 10 bar respectively is opened. Thus final pressure if two bulbs opened at the same temperature is

 At constant temperature

P₁V₁+P₂V₂ =P_R(V₁+V₂)   

5x10 +10x5 = P_R(5+10)

P_R= 100/15 =6.67 bar.

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Initially both bulbs are under similar condition hence number of moles of gas in each container

Total number of moles in both bulbs;

When temperature of one of the bulb is increases from T₁ toT₂ then final pressure P_f  and number of moles.