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78 grams of benzene is burnt in air, how much water will it produce?

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78 grams of benzene is burnt in air, how much water will it produce?

(a) 18 grams

(b) 36 grams

(c) 54 grams

(d) 72 grams
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Right choice is (c) 54 grams

To explain I would say: The balanced chemical reaction is C6H6 + 7.5O2 -> 6CO2 + 3H2O, => moles of water = 3*78/78 = 3, => weight of water produced = 3*18 = 54 grams.
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