Problem: Which statement about enthalpy is true?a. The enthalpy of formation for a pure element in its standard state is always positiveb. The enthalpy of formation of formation for a pure element in its standard state is always negative.c. Enthalpy is a state function because its change depends only on initial and final conditionsd. Enthalpy is not a state function because its change depends on the identities of the reactants and products

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Recall the definition of enthalpy

  • amount of energy within a substance that is available for conversion to heat 
  • property of a thermodynamic system
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Problem Details

Which statement about enthalpy is true?

a. The enthalpy of formation for a pure element in its standard state is always positive

b. The enthalpy of formation of formation for a pure element in its standard state is always negative.

c. Enthalpy is a state function because its change depends only on initial and final conditions

d. Enthalpy is not a state function because its change depends on the identities of the reactants and products

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