Question

value for heat capacity at constant volume

Answer 1

Heat Capacity at Constant Volume

Q = nCVΔT

For an ideal gas, applying the First Law of Thermodynamics tells us that heat is also equal to:

Q = ΔEint + W, although W = 0 at constant volume.

For a monatomic ideal gas we showed that ΔEint = (3/2)nRΔT

Comparing our two equations

Q = nCVΔT and Q = (3/2)nRΔT

we see that, for a monatomic ideal gas:

CV = (3/2)R

For diatomic and polyatomic ideal gases we get:

diatomic: CV = (5/2)R

polyatomic: CV = 3R

This is from the extra 2 or 3 contributions to the internal energy from rotations.

Because Q = ΔEint when the volume is constant, the change in internal energy can always be written:

ΔEint = n CV ΔT

Answer 2

H = i2×r×t it is.......