Molecules of oxygen in one breath of air that has a volume of 2 L at STP should be calculated when the air has 20.9% oxygen. Concept Introduction: According to Avogadro’s law in 1 mole of a substance there are 6.023 × 10 23 units of substance present. Thus, 1 mol of oxygen has 6.023 × 10 23 atoms of oxygen.

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Chapter 5, Problem 5.44P

Interpretation Introduction

Interpretation:

Molecules of oxygen in one breath of air that has a volume of 2 L at STP should be calculated when the air has 20.9% oxygen.

Concept Introduction:

According to Avogadro’s law in 1 mole of a substance there are 6.023×1023 units of substance present.

Thus, 1 mol of oxygen has 6.023×1023 atoms of oxygen.

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