Question

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Answer 1

1. a) Mass of nitrogen atom is 14gram.

b) Mass of aluminum is 108gram.

c) Mass of 10 moles of sodium sulphite is 1260 grams.

2. (a) 32 g of oxygen gas = 1 mole

Then, 12 g of oxygen gas = 12 / 32 mole = 0.375 mole

(b) 18 g of water = 1 mole

Then, 20 g of water = 20 / 18 mole = 1.111 mole

(c) 44 g of carbon dioxide = 1 mole

Then, 22 g of carbon dioxide = 22 / 44 mole = 0.5 mole

3. (a) Mass of one mole of oxygen atoms = 16 g

Then, mass of 0.2 mole of oxygen atoms = 0.2 x 16g = 3.2 g

(b) Mass of one mole of water molecule = 18 g

Then, mass of 0.5 mole of water molecules = 0.5 x 18 g = 9 g

Answer 2

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