Chemistryhard · Past Paper
How many grams of Oxygen are needed to burn 12g of Magnesium completely? (Mg=24, O=16)
A8g
B16g
C32g
D4g
✓ Correct Answer: A — 8g
2Mg + O2 -> 2MgO. 48g Mg reacts with 32g O2. So 12g Mg reacts with (32/48)*12 = 8g O2.
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