See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

In linear molecule  3 translation + 2 Rotation = 5 motion Energy contribution 1 5 5 KT KT 2 2    by one molecule av 5 5 N KT RT 2 2  by one mole. In bent triatomic  3 translation + 3 Rotation = 6 motion Energy contribution 1 6 KT 2   = 3 KT by one molecule By one mole = 3 KT × Nav = 3RT In monoatomic  3 translation motion Energy contribution 3 RT 2  by one molecule.