Figure (27-E5) shows two rigid vessels A and B, each of volume 200 cm 3 containing an ideal gas (CV

Figure (27-E5) shows two rigid vessels A and B, each of
volume 200 cm 3 containing an ideal gas (CV  12.5
J K  1 mol  1). The vessels are connected to a manometer
tube containing mercury. The pressure in both the vessels
is 75 cm of mercury and the temperature is 300 K. (a)
Find the number of moles of the gas in each vessel. (b)
5.0 J of heat is supplied to the gas in the vessel A and
10 J to the gas in the vessel B. Assuming no appreciable
transfer of heat from A to B calculate the difference in
the heights of mercury in the two sides of the manometer.
Gas constant R  8.3 J K  1 mol  1

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