Question -
How many grams of oxygen are required for complete combustion of 2 moles of benzene?
Options:
A .  450g
B .  480g
C .  500g
D .  530g
Answer: Option B : B The balanced reaction for combustion of benzene is 2C6H6+15O2→12CO2+6H2O Therefore, 15 moles of oxygen gas is required for complete combustion of benzene. We know that, 1mole of O2 = 32g ∴15moles of O2 = 15×32 = 480g
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