Molar heat capacity

[ZoeHahn1J]

What determines a substance's molar heat capacity? From Cv,m = delta U/delta T, it appears that molar heat capacity would depend on the change in internal energy and temperature of a monatomic gas, but molar heat capacities are independent of temperature, so I'm unsure of what actually determines them. Thanks so much!

[Angela G 2K]

Molar heat capacity is the amount of heat needed to raise one mole of a substance by one degree Kelvin, and is dependent on the intermolecular forces between the particles. For example, a substance with strong intermolecular forces (such as water, which has hydrogen bonds) would have a higher heat capacity than a substance with weaker intermolecular forces.

[Elizabeth Ignacio 1C]

Heat capacity is dependent on temperature, as you mentioned with C_v = ΔU/ΔT (equation for heat capacity at a constant volume).

To find the molar heat capacity at a constant volume, you take C_v and divide it by however many moles of substance you have. You're looking for the heat capacity per unit (mole) of pure substance. C_v,m = C_v /m