Question

Calculate the mass of 0.2 moles of water molecules

Answer 1

1 mole of water = molecular mass of water in grams

= mass of 2H atoms + mass of

O atom

= 2 × 1 + 16

= 2 + 16 =18 g

now, mass of 1 mole of water = 18g

so, mass of 0.2 mole of water = 18 × 0.2= 3.6 g

the mass of 0.2 mole of water is 3.6 g

Answer 2

molar mass of water=18g
mass of 0.2 mole of water=0.2×18=3.6g