Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Molar heat capacity Cp (J/(mol·K))

Required number input.

Compute the molar heat capacity at constant volume from Cp using the ideal gas relation Cv = Cp − R. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Molar heat capacity Cv (J/(mol·K))

The resulting molar heat capacity cv returned as a number.

• Thermodynamic quantities are state- and temperature-dependent and must use consistent reference states and sign conventions. Heat loss, phase changes, non-ideal mixing, path-dependent work, and heat-capacity variation may need separate treatment.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• CP Minus CV

  Report the Mayer relation for an ideal gas as the difference between molar heat capacities at constant pressure and constant volume.

• CV For Diatomic Ideal Gas

  Report the molar heat capacity at constant volume for a diatomic ideal gas as five halves of the gas constant.

• Gamma Heat Capacity Ratio

  Compute the adiabatic index gamma as the ratio of molar heat capacity at constant pressure to that at constant volume.