Calculate the mass fraction of oxygen in magnesium oxide.
| September 23, 2021 | education
The formula for magnesium oxide is MgO. Let’s find its molar mass:
M (MgO) = M (Mg) + M (O) = 24 + 16 = 40 g / mol;
The mass fraction of an element in a chemical substance is equal to the atomic mass of the element multiplied by its stoichiometric index and divided by the molar mass of the substance.
w (O) = (16 * 1) / 40 = 0.4 = 40%.
Answer: w (O) = 40%.
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