The reaction which shows standard heat of formation of water correctly is

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2H2g+O2g→2H2Ol,∆H=-136.6 kcals

answer is A.

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Detailed Solution

“The enthalpy change when one mole of a substance is formed in its standard state from its constituent elements in their standard standard states is called standard enthalpy of formation"Standard states of hydrogen….gas,oxygen….gas and water….liquid;In 4th option two moles of water is formed ;So option 1 is correct ;

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