Question

0.5 moles of water molecules.

Answer 1

For 1 mole of water =molecular mass of water (H2O)in grams =mass of 2H atoms +mass of O atoms =2×1+16
=2+16
=18 grams ⇒ for 1 mole

For 0.5 moles = 18×0.5
= 9.0 grams