The ionisation enthalpy of hydrogen atom is `1.312 xx 10^6" J mol"^(-1)`. The energy required to excite the electron in the atom from n = 1 to n = 2 is

Options

A. `8.51xx10^(5) J mol^(-1)`
B. `6.56xx10^(5) J mol^(-1)`
C. `7.56xx10^(5) J mol^(-1)`
D. `9.84xx10^(5) J mol^(-1)`

Answer

4

Explanation

I.E. `=1.312xx10^(6) J mol^(-1)`
The energy required to excite the electron in the atom from `n_(1)=1` to `n=2`.
`=1.312xx10^(6)[1-1/4]=1.312xx10^(6)xx3/4=9.84xx10^(5) J mol^(-1)`