
Concept explainers
Interpretation:
The amount of MgO formed when 1.25 g of Mg reacts with oxygen gas needs to be deduced based on the given reaction.
Concept Introduction:
- A
chemical reaction is expressed as a chemical equation having reactants and products on left and right side of the reaction arrow respectively. - The coefficient of a balanced chemical equation i.e. the stoichiometry gives the amount of reactants and products involved in the reaction.
- Chemical equations can therefore be used to determine the amount of products formed from a known quantity of reactants.

Answer to Problem 24A
Mass of MgO = 2.08 g
Explanation of Solution
The given reaction is:
Step 1: Calculate the moles of Mg present:
Mass of Mg present = 1.25 g
Step 2: Calculate the moles of MgO formed:
Based on the reaction stoichiometry:
2 moles of Mg will yield 2 moles of MgO i.e. they are present in a 1:1 molar ratio
Therefore, 0.0521 moles of Mg will yield 0.0521 moles of MgO
Step 3: Calculate the mass of MgO formed:
Moles of MgO formed = 0.0521
Molecular weight of MgO = 40 g/mol
Therefore, mass of MgO produced is 2.08 g.
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