Answer to Question #168024 in General Chemistry for YOMI

Question

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An animal takes a breath with a volume of 5.70 L at standard temperature and pressure. If air contains a 20.9% oxygen, how many molecules of oxygen are in one breath?

.............O2 molecules

Answer 1

Volume of O2 = 5.70×0.209

= 1.19 L

Moles = Volume/22.4

= 1.19/22.4

= 0.0531 mol

Number of molecules = 0.0531×6.022×10²³

= [3.20×10²²] molecules