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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Chemistry

Miranda

5 March, 14:42

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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Jose Arias · Answer 1

B

In order to incorporate the reverse reaction, the enthalpy must be multiplied by one. This makes sense because if a reaction releases 100 J of energy, the enthalpy is - 100 J. In order to do the reverse reaction, the products will require 100 J of energy, so the enthalpy becomes + 100 J.