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What are the number moles of Oxgen present there in the cylinder?

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What are the number moles of Oxgen present there in the cylinder?

(a) 1

(b) 2

(c) 3

(d) 4

I had been asked this question at a job interview.

This key question is from Mole and Molecular Weight topic in portion Introductory Concepts of Chemical Process Calculation

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Right option is (c) 3

To explain: Number of moles of O2 = 2+1 = 3.

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