Essential Chemistry for IGCSE - Chemical Calculations (Section 4 - No. 27)
In the reaction 2Mg + O2 -> 2MgO, if 24g of Mg reacts, how many grams of O2 are required?
8g
16g
24g
32g
Explanation
Using the balanced equation, the mole ratio is 2:1 (Mg:O2). The molar mass of Mg is 24 g/mol and O2 is 32 g/mol. Therefore 24g Mg needs 16 g O2.
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