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the standard enthalpy of formation for C2H5OH

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The correct equation for which the enthalpy change defines the standard enthalpy of formation for C2H5OH (l) is :

A. CH2 + CH2 + H2O -->CH3CH2OH
B. CH3CHO + H2 -->CH3CH2OH
C. 4 C + 6 H2 + O2 --> 2 CH3CH2OH
D. 2C + 3H2 + 1/2 O2 -->2 C2H5OH
E. 2C + 6H + O --> C2H5OH

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