Answer to Question #189579 in General Chemistry for leen

General Chemistry

Question #189579

The mass of magnesium oxide resulting from the combustion of 8 g of the element magnesium

Expert's answer

2Mg + O2 = 2MgO

n(Mg) = m/M = 8g/24g/mol = 0.33 mol

According to the equation

n(MgO) = n(Mg) = 0.33 mol

M(MgO) = 24 + 16 = 40 g/mol

m(MgO) = n*M = 0.33 mol*40 g/mol = 13.2 g

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