Because there no choices there, most probably it should be about hydrogen bonding in the water, which is the most important intermolecular force in water.
Answer:
I believe Si12H26+02 is the coefficient I might be wrong, Sorry if I am.
From,
RAM=element×its relative abudance/total abudance
=((107×13)+(12×109))/25
The answer is=107.96
Ionization energy is the measure of the extend to which the nucleus attracts the outermost electron
if ionization energy us high than force of attraction Is high so it is not easy to remove and vice versa .
hope you understand.....
