Use the molar constant volume heat capacities for gases given in Topic 4C (as multiples for R) to estimate the change in reaction enthalpy of N2 (g) + 3 H2 (g) ---> 2 NH3 (g) when the temperture is increased from 300. K to 500. K. Ignore the vibrational contributions to heat capacity. Is the reaction more or less exothermic at the higher temperature?    Atoms Linear Molecules Nonlinear Molecules Cv,m  3/2 R 5/2 R 3 R Cp,m 5/2 R 7/2 R 4 R

Question

Use the molar constant volume heat capacities for gases given in Topic 4C (as multiples for R) to estimate the change in reaction enthalpy of N2 (g) + 3 H2 (g) ---> 2 NH3 (g) when the temperture is increased from 300. K to 500. K. Ignore the vibrational contributions to heat capacity. Is the reaction more or less exothermic at the higher temperature? 

  Atoms Linear Molecules Nonlinear Molecules
Cv,m  3/2 R 5/2 R 3 R
Cp,m 5/2 R 7/2 R 4 R

 

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