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Q.

The heat of combustion of carbon to ${CO}_{2}$ is $- 393.5 {K J.mole}^{- 1}$ . The heat released upon formationof 35.2 g of ${CO}_{2}$ from carbon and oxygen gas is

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a

630 KJ

b

3.15 KJ

c

315 KJ

d

31.5 KJ

answer is C.

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Detailed Solution

$\underset{(grap)}{1 C} + O_{2} \to 1 {CO}_{2}, △ H = - 393.5 KJ$

$44 gm {CO}_{2} \to - 393.5 KJ$

$35.2 gm {CO}_{2} \to ? (x)$

$x = - 315 KJ$

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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