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.
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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