When ch3i molecules in the vapor state absorb 253.7 nm light they dissociate into methyl radicals and iodine atoms the energy required to rupture?

Wavelenght = 253.7 nm = 253.7 x 10^-^9 m

Energy of photon associated with this wavelength,
= 
=  
= 7.838 X  J

Thus, energy required to rupture C-I bond is 7.838 X 10^(-19) J

If you open the bottle of perfume then nothing but the smell will come out of it and yes it is a type of gas smell because it’s say it in english so i can understand better and you

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water