Is the standard enthalpy of formation for solid potassium chlorate (KClO3) equal to +41.3 kJ/mol?

The statement is false. The standard enthalpy of formation refers to the change in enthalpy when one mole of a compound is formed from its elements in their standard states. For potassium chlorate (KClO3), the dissolution process described in the balanced equation indicates that when solid KClO3 dissolves in water, it absorbs energy, reflected by the positive delta H (ΔHrxn) of +41.3 kJ/mol. This value specifically refers to the enthalpy change associated with the dissolution of KClO3, not the standard enthalpy of formation of KClO3 itself.