Question

total number of lone pairs in 1.5 moles of water

Answer 1

it's your answer bhi

Answer 2

1 molecule water has 2 lone pairs. So 1 mol water will have 2 mol lone pairs. And 1.5 mol water will have 3 mol lone pairs.
So the no. of lone pairs
= 3*NA
=3*6.022*10^23
=18.066*10^23