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Stoichiometry: How much magnesium oxide, in grams, is produced from the reaction of 2 grams of magnesium?
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Stoichiometry: How much magnesium oxide, in grams, is produced from the reaction of 2 grams of magnesium?
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Jan 9, 2018
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Stoichiometry: How much magnesium oxide, in grams, is produced from the reaction of 2 grams of magnesium?
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Dolkar
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1) Chemical equation:
Mg + O2 -> MgO
2) Balanced chemical equation:
2Mg + O2 -> 2MgO
3) Ratios
2 mol Mg : 1 mol O2 : 2 mol MgO
4) Convert 2 grams of Mg to number of moles
Molar mass of Mg: 24.3 g/mol
# of moles = grams / molar mass = 2g / 24.3 g/mol = 0.0823 mol
5) Use the theoretical ratio fo find the number of moles of MgO produced
0.0823 mol Mg * 2mol MgO / 2 mol Mg = 0.0823 mol MgO
6) Use the molar mass of MgO to obtain the quantity in grams
Molar mass of MgO = 24.3 g/mol + 16 g/mol = 40.3 g/mol
0.0823 mol MgO * 40.3 g/ mol = 3.32 g
Answer: 3.32 g
Dave Amphlett
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Jan 14, 2018
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Dave Amphlett
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