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Oxygen is required for the metabolic combustion of foods. Calculate the number of atoms in 38.0 g of oxygen gas, the amount absorbed from the lungs in about 15 min when a person is at rest.

Answer :

The number of atoms is calculated by the moles of substance and Avogadro's number. The number of atoms contained in 38.0 grams of oxygen is 12.04 x 10²³.

What is the number of particles?

The number of particles is defined by the dividing mass of the substance by the molar mass and then multiplying the result with Avogadro's number (Nₐ), 6.02 x 10²³.

Given,

Mass of oxygen = 38.0 grams

The molar mass of oxygen = 16.0 grams per mole

Moles are calculated as:

Moles (n) = mass ÷ molar mass

n = 38 ÷ 16

n = 2 moles

If 1 mole = 6.02 x 10²³

Then, 2 moles = 12.04 x 10²³

Therefore, 38 gm of oxygen contains 12.04 x 10²³ atomic particles.

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