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What is the mass fraction of O in the sample?

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What is the mass fraction of O in the sample?

(a) 0.2

(b) 0.4

(c) 0.6

(d) 0.8

I have been asked this question in my homework.

I would like to ask this question from Choosing a Basis topic in section Introductory Concepts of Chemical Process Calculation

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The correct answer is (b) 0.4

The best I can explain: Take basis as 1 Kg mole of Na, mass fraction = 16/40.

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