The heat of combustion of carbon to CO₂ is -395.5 kJ/mol. The heat released upon the formation of 35.2 g CO₂ from carbon and oxygen gas is

-315 kJ

+315 kJ

-630 kJ

-318 kJ

Solution

-315 kJ

Given comma space straight C space left parenthesis straight s right parenthesis space plus space straight O subscript 2 space left parenthesis straight g right parenthesis space rightwards arrow space CO subscript 2 space left parenthesis straight g right parenthesis semicolon increment subscript straight f straight H space equals space minus 393.5 space kJ space mol to the power of negative 1 end exponent therefore comma space Heat space released space on space formation space of space 44 space straight g space or space 1 space mole CO subscript 2 space equals space minus 395 space kJ space mol Therefore comma Heat space released space on space formation space of space 35.2 space straight g space of space CO subscript 2 space equals space fraction numerator negative 393.5 space kJ space mol to the power of negative 1 end exponent over denominator 44 space straight g end fraction space straight x space 35.2 space straight g space equals space minus space 315 space kJ space mol to the power of negative 1 end exponent

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