Question

how to calculate the mass percentage of magnesium​

Answer 1

Answer:

Example calculation:

Mass magnesium = 2.39 g.

Mass magnesium oxide = 3.78 g.

So mass oxygen = 1.39 g.

Number moles Mg = 2.39/24 = 0.0995.

Number moles O = 1.39/16 = 0.0868.

Divide by the smallest to give the ratio aproximately 1 Mg : 1 O.

This would suggest a formula of MgO, which is the correct formula.

Explanation:

Answer 2

Answer and Explanation:

• To calculate the mass percent of an element in a compound, we divide the mass of the element in 1 mole of the compound by the compound's molar mass and multiply the result by 100.

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