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Q.

The heat of combustion of carbon to CO2 is −393.5K J.mole−1. The heat released upon formationof 35.2 g of CO2 from carbon and oxygen gas is

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a

3.15 KJ

b

315 KJ

c

630 KJ

d

31.5 KJ

answer is C.

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Detailed Solution

1C(grap)+O2→1CO2,△H=−393.5KJ

44gmCO2→−393.5KJ

35.2gmCO2→?(x)

x=−315KJ

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The heat of combustion of carbon to CO2 is −393.5K J.mole−1. The heat released upon formationof 35.2 g of CO2 from carbon and oxygen gas is