Pure oxygen is mixed with air to produce an enriched air containing 50 – McqOptions

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1.	Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?
A.	1.72
B.	0.58
C.	0.5
D.	0.2
Answer» C. 0.5

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