One molecule of a substance absorbs one quantum of energy. The energy involved with `1.5` mole of the substance absorbs red light of frequency `7.5 xx 10^14 sec^-1` will be.

Options

A. `2.99 xx 10^5 J`
B. `3.23 xx 10^5 J`
C. `4.48 xx 10^5 J`
D. `2.99 xx 10^6 J`

Answer

C

Explanation

( c) For one molecule
`E = hv`
For `1.5` mole
`E = 1.5 xx 6.023 xx 10^23 xx hv`
=`1.5 xx 6.023 xx 10^23 xx 6.626 xx 10^-34 xx 7.5 xx 10^14`
=`4.48 xx 10^5 J`.