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Question

The formula unit mass of Na2O is ____.

A
50
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B
52
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C
62
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D
48
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Solution

The correct option is C 62
Formula unit mass is the sum of the atomic masses of all the ions that form an ionic compound.

Na2O is constituted by two Na+ and one O2 ions.

Hence, the formula unit mass of Na2O = (2 × atomic mass of Na) + atomic mass of O = (2 x 23) + 16 = 62 u.

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