HARDMCQ SINGLEJEE Mains ChemistryPhysical ChemistryAtomic StructureIntro

The ionization enthalpy of hydrogen atom is 1.312 × 10⁶ J mol⁻¹. The energy required to excite the electron from n = 1 to n = 2 is

0.8.51 × 10⁵ J mol⁻¹

1.6.56 × 10⁵ J mol⁻¹

2.7.56 × 10⁵ J mol⁻¹

3.9.84 × 10⁵ J mol⁻¹

Explanation

E₁ = −1.312 × 10⁶ J mol⁻¹. E₂ = E₁/4 = −3.28 × 10⁵ J mol⁻¹. ΔE = E₂ − E₁ = (−3.28 × 10⁵) − (−1.312 × 10⁶) = 9.84 × 10⁵ J mol⁻¹

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