Question

1. Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide.
2. What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?​

Answer 1

Question :-

1. Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide.

2. What is the mass of:

(a) 0.2 mole of oxygen atoms?

(b) 0.5 mole of water molecules?

Answer :-

1. (a) Given mass of oxygen gas = 12 g

Molar mass of oxygen gas (O2) = 32 g

Mole of oxygen gas 12/32 = 0.375 mole

(b) Given mass of water = 20 g

Molar mass of water (H2O) = (2 x 1) + 16 = 18 g

Mole of water = 20/18 = 1.12 mole

(c) Given mass of Carbon dioxide = 22 g

Molar mass of carbon dioxide (CO2) = (1 x 12) + (2 x 16)

= 12 + 32 = 44 g

∴ Mole of carbon dioxide = 22/44 = 0.5 mole

2. (a) Mole of Oxygen atoms = 0.2 mole

Molar mass of oxygen atoms = 16 g

Mass of oxygen atoms = 16 x 0.2 = 3.2 g

(b) Mole of water molecule = 0.5 mole

Molar mass of water molecules = 2 x 1 + 16= 18 g .

Mass of H2O = 18 x 0.5 = 9 g

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