Two flasks of equal volume are connected by a narrow tube (of negligible volume ) all at 27 degrees Celsius and contain 0.70 moles H2 at 0.5 atm . One of the flask is then immersed into a bath kept at 127 degrees Celsius. Find number of moles of H2 in the flasks.

@ sudarshan 
i can give u the way to approach these question . its a very good ques actually . 
initially   the total moles are = 70 . 
and the temp are 27 degree at the two pipes . 
so, acc to the ques 
n1+n2 = 70 
pv = nrt . 
apply this equation for both separatrely and u will get n1 and n2 .. 
initially both have same no of moles = 35 moles in each . 
so, for container frst = p1v1 / n1t1 = p2v2/n2t2 . 
p1 – pressure ( final ) 
v1 – volume (final ) 

so, n1t1 = n2t2 . 
HOPE U CAN SOLVE IT NOW 
IF NOT THEN LET ME KNOW I WILL SOLVE FULLY . 
ALL THE BEST ..