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  • Topic:


Helium atom can be excited to 1s2, 2p1 configuration by light of 58.44 nm. The lowest excited state with configuration 1s2, 2s1 lies 4857 cm-1 (1/λ) below the 1s1, 2p1 state. What would be the average He - H bond energy so that HeH2 could form, non-endothermically from the lowest excited singlet state of helium? Neglect any difference between G and H and take H as 218 kJ mol-1

(A) 1614 kJ mol-1

(B) 1212 kJ mol-1

(C) 912 kJ mol-1

(D) 1511 kJ mol-1