Question

9. What is the mass of:
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?
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Answer 1

Answer:

Explanation:

3.2 grams

-Therefore, the mass of 0.2 moles of oxygen atom is 3.2 grams and the mass of 0.5 moles of a water molecule is 9.0 grams.

9g

Mass of 0.5 mole of water is 9g.

Answer 2

Answer:

1 mole of oxygen atoms has a mass of 16gm which is its atomic mass,

So 0.2 moles of oxygen atoms have the mass of 0.2×16 = 3.2gm

1 mole of water molecules has a mass of 18gm which is its molecular weight.

So 0.5 moles of water molecules has a mass of 0.5 × 18 = 9gm