Question

Find the mass of:(a) .2 moles of oxygen gas (b) 1.5 moles of water (c) 3 moles of neon

(a) .5 moles of sodium (e) 2 moles of nitrogen element​

Answer 1

Answer:

1. 1 mole of O2 gas has mass 32 g.

Thus, 0.2 moles of O2 has mass 0.2 × 32 = 6.4 g.

2. 1 mole of water weighs 18 g.

Thus, 1.5 moles of water has mass 1.5 × 18 = 27 g.

All the examples are done the way 2 above are solved. Kindly try yourself.

Answer 2

Explanation:

(a) The mass of 1 mole of oxygen atoms = 16 g

Thus, the mass of 0.2 mole of oxygen atoms = 16 × 0.2 = 3.2 g

b) The mass of 1 mole of water molecules = 18 g

Thus, the mass of 0.5 mole of water molecules = 18 × 0.5 = 9.0 g