Question

In a container, there are 4 moles of nitrogen, 3 moles of oxygen and 7 moles of hydrogen; find out the mole fraction of oxygen in this reaction.

(a) 0.2143

(b) 0.2142

(c) 0.1234

(d) 0.2434

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Answer 1

The correct answer is (a) 0.2143

To elaborate: Mole fraction of a substance is given by the formula: Mole fraction = No. of moles of that substances/No. of total moles of solution. Mole fraction of oxygen here = 3/4 + 3 + 7 = 3/14 = 0.2143.