Practice portal › Thermodynamics › Isobaric and Isochoric Processes
Asked in JEE Main 2009 · Isobaric Heat and Work
On the P-T diagram AB runs at constant pressure, so it is isobaric and
W_by=nRΔ T.
Reading the figure, A is at 300 K and B at 500 K on the 2×10⁵ Pa
line, so Δ T=+200 K for two moles.
W_by=2R×200=+400R, and the work done on the gas is therefore -400R.
The printed key, 400R, is the magnitude. The three questions of this 2009
block do not use one sign convention between them. Listed in DEFECTS.md.
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