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The heat of combustion of carbon to CO2 is -393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is

(a) + 315 kJ

(c) - 3.15 kJ

(b) - 630 kJ

(d) - 315 kJ

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Sol: Given : $C_{(s)} + O_{2(g)} \to CO_{2(g)}, ΔH = - 393.5 kJ/mol$

$⇒$ Amount of heat released on formation of 

$44 g \text{ } CO_2 = 393.5 kJ$

∴ Amount of heat released on formation of 

$35.2 g \text{ } CO_2 = {393.5\over44}\times35.2 = 314.8 ≈ 315 kJ$

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