Question

what is the percent by mass of Magnesium in MgO?​

Answer 1

Answer:

39.70 %.is the percent by mass of Magnesium in MgO

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Answer 2

Answer:

60%

Explanation:

MgO has molecular mass of 24 + 16 = 40 gm

Mg has atomic mass of 24 gm

percent by mass of Magnesium = atomic mass of Mg / molar mass of MgO * 100

= 24 / 40   * 100 = 60%