In what way should the enthalpy of an intermediate step be manipulated when used to produce an overall chemical equation? a. multiply the enthalpy by 1 if the chemical equation is reversed b. multiply the enthalpy by –1 if the chemical equation is reversed. c. add 2 to the enthalpy if the coefficients must be doubled. d. add 2 to the enthalpy if the coefficients must be cut in half.
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