Question

How many grams of magnesium oxide (MgO) are produced when 1200 grams of magnesium (Mg) burn in an excess of oxygen, as shown below?

2Mg + O2 ---> 2MgO

Answer 1

Answer on Question #50324, Chemistry, Other

Task:

How many grams of magnesium oxide (MgO) are produced when 1200 grams of magnesium (Mg) burn in an excess of oxygen, as shown below?

2Mg + O₂ ---> 2MgO

Answer:

$$\nu = \frac{m}{M}$$ $$M(Mg) = 24.3\,g/mol$$ $$M(MgO) = 40.3\,g/mol$$ $$\nu(Mg) = \frac{1200}{24.3} = 49.4\,mol$$ $$\nu(Mg) = \nu(MgO) = 49.4\,mol$$ $$m(MgO) = \nu(MgO) \cdot M(MgO)$$ $$m(MgO) = 49.4 \cdot 40.3 = 1990.1\,g$$

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