Chemistry

Select the two conditions that must be met by a thermochemical equation so that its standard enthalpy change can be written as ÄfH°.
a) One mole of each reactant is used.

b) All substances are at 0°C and 1.013x105 Pa pressure.

c) The reactants are found in their standard states.

d) One kilogram of the substance is produced.

e) One mole of a compound is produced.

f) The values of ÄH for each substance must be specified.

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  1. Look at a and c. I also thought 25 C (298.15 K) was specified.

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