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Standard XII

Chemistry

PV Work

An ideal gas ...

Question

An ideal gas undergoes the cyclic process abca as shown in the given P-V diagram. It rejects 50 J of heat during ab and absorbs 80J of heat during ca. During bc, there is no transfer of heat and 40J of work is done by the gas. What should be the area of the closed curve abca?

30 J

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40 J

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10 J

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90 J

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Solution

The correct option is A 30 J
For cyclic process abca, summation of heat will be equal to summation of work.
Now $Δ Q = Q_{a b} + Q_{b c} + Q_{c a} = - 50 + 80 + 0 = 30 J$

$∴ Δ W = 30 J$

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An ideal gas undergoes the cyclic process abca as shown in the given P-V diagram. It rejects 50 J of heat during ab and absorbs 80J of heat during ca. During bc, there is no transfer of heat and 40J of work is done by the gas. What should be the area of the closed curve abca?

The correct option is A 30 JFor cyclic process abca, summation of heat will be equal to summation of work. Now ΔQ=Qab+Qbc+Qca=−50+80+0=30 J ∴ΔW=30 J

The correct option is A 30 J
For cyclic process abca, summation of heat will be equal to summation of work.
Now $Δ Q = Q_{a b} + Q_{b c} + Q_{c a} = - 50 + 80 + 0 = 30 J$

$∴ Δ W = 30 J$