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In a sample of hydrogen atom containing 1 mole of H atoms, electrons in 30% of H-atoms are in 1^"st" excited state and remaining are in 2^"nd" excited state and ground state . If the total energy emitted when all electrons return to ground state is 642.24 kJ, find % of electron in 2^"nd" excited state . Energy level in H-atom =E_1=-13.6 eV, E_2=-3.4 eV, E_3= -1.5 eV and (1 eV/ species =96 kJ /mole) |
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