1.

Show that for an ideal gas cp-cv=r

Answer»

Cv = Heat capacity at constant volume.

Cp = Heat capacity at constant pressure.

q, at constant volume qv = CvΔT = ΔU ...(I)

at constant volume qp = CpΔT = ΔH  ....(II)

We know that —

for one mole ideal gas —

ΔH = ΔU + Δ(PV)

= ΔU + Δ(RT)

= ΔU + RΔT   (R = constant)

ΔH = ΔU + RΔT

ΔH - ΔU = RΔT ....(III)

Subtracting equation (I) from equation (II) —

ΔH - ΔU = CpΔT - CvΔT  ....(IV)

from equation (III) and (IV) —

CpΔT - CvΔT = RΔT

Cp - Cv = R



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