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Question

Find the number of moles of Na2CO3 which contain 4.5 moles of oxygen atoms.

A
1.0 mol
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B
1.5 mol
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C
4.5 mol
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D
None of these
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Solution

The correct option is B 1.5 mol
From the molecular formula of Na2CO3,
one mole of sodium carbonate contains 3 moles of O atom.

The number of moles of sodium carbonate that contain 4.5 moles of O atoms = 1×4.53=1.5 mol

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