Question

5 moles of H2O to grams

Answer 1

Mass = Molar mass × No. of moles
Molar mass of Water(H2O) = 1+1+16 = 18 gm
No. of moles = 5
Therefore, total mass = 18 × 5 = 90 gm

Answer 2

mass = moles x molar mass
molar mass of H2O is 18
therefore mass = 18 x 5
=90 g