The thermochemical equation for the formation of water is: What is the standard enthalpy of formation of water? - Wired Faculty

Thermodynamics

Question

The thermochemical equation for the formation of water is:
$2 straight H subscript 2 left parenthesis straight g right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space 2 straight H subscript 2 straight O left parenthesis straight I right parenthesis space increment subscript straight r straight H to the power of 0 space equals space minus 571.8 space kJ$

What is the standard enthalpy of formation of water?

Solution

straight H subscript 2 left parenthesis straight g right parenthesis space plus space 1 half straight O subscript 2 left parenthesis straight g right parenthesis space rightwards arrow space space straight H subscript 2 straight O space left parenthesis l right parenthesis space semicolon space space space space increment subscript straight f straight H to the power of 0 space equals space fraction numerator negative 571.8 over denominator 2 end fraction space equals space minus 285.9 space kJ

Thus, standard enthalpy of formation of water

left parenthesis increment subscript straight f straight H to the power of 0 right parenthesis

is -285. 9 kJ

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