Answer :
The given statement "the physical state of a reactant or product will affect the enthalpy of reaction in a thermochemical equation," is false.
The heat of reaction is influenced by the physical state of the reactants and products.
What is thermochemical equation?
The term "thermochemical equation" refers to a balanced chemical equation that not only specifies the quantities of the various reactants and products but also the quantity of heat generated or absorbed.
A thermochemical equation may be written using fractional coefficients.
H2 ( g ) + ½ O2 ( g ) ⇒H2O ( l ) +285.8 KJ mol-1
H2 ( g ) + ½ O2 ( g ) ⇒ H2O ( l ) ΔH = – 285.8 KJ mol-1
When 1 mole of hydrogen and 0.5 mole of oxygen react, 285.8 KJ mol-1 of heat is produced. The heat generated will also double if the reactant amounts are doubled.
2H2 ( g ) + O2 ( g ) → 2 H2O ( l ) + 571.6 KJ mol-1
2H2 ( g ) + O2 ( g ) → 2H2O ( l ) ,ΔH = – 571.6 KJ mol-1
Heat of reaction, reaction enthalpy, or reaction enthalpy change:
The heat of reaction, enthalpy of reaction, or enthalpy change of reaction is the quantity of heat that is evolved or absorbed in a chemical reaction once the number of moles of reactants as represented by the chemical equation have completely reacted.
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