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Answer 1 · 2016-02-25T17:25:00

(a) and (b) are both equivalent and are the correct answers.

First work out the number of moles of water in this 36 grams :

#n=m/(M_r)#

#=36/(1+1+16)#

#=2mol#.

But 1 mole has #6.023xx10^23# particles.

Hence 2 moles will have #1.2046xx10^24# molecules.

This may also be written as #12.046xx10^23#.

Thus the correct answer is both (a) and (b) as they are equivalent.