Question

to find mass of 20 water molecules.

Answer 1

Explanation:

the mass of 20 water molecules =360u

Answer 2

• we know that , gram molecular mass of H2O = 18g.

Further, mass of 1 water molecule

= Gram molecular mass / Avogadro's number.

= 18g / 6.022× 10²³

= 2.99 × 10‐²³g.

• Therefore mass of 20 water molecules =
• = 20 × 2.99× 10‐²³g
• = 5.98 × 10‐²² g

Hope it helps you