How many grams of magnesium and oxygen does it take to make 10g of magnesium oxide?
April 29, 2021 | education
| Decision:
Let’s write the reaction equation for the interaction of magnesium with oxygen
2Mg + O2 = 2MgO;
The relative atomic mass of magnesium is 24, oxygen is 16. This means that the molecular weight of magnesium oxide is 40 g / mol.
Let’s find the amount of substance in magnesium oxide:
10/40 = 0.25 mol;
Magnesium has the same coefficient as magnesium oxide. This means that the amount of substance in magnesium is 0.25 mol. Let’s find the mass of magnesium:
24 * 0.25 = 6 grams;
There is a factor 2 times lower before oxygen than before magnesium oxide. This means that the amount of substance in oxygen is 0.125 mol. Let’s find the mass of oxygen:
32 * 0.125 = 4 grams;
Answer: the mass of magnesium is 6 grams, the mass of oxygen is 4 grams.
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