Which equation represents the reaction whose ΔH,represents the standard enthalpy of formation of CHCl₃(l)at 25°C? (i.e. ,for which is ΔH = ΔH°_f of CHCl₃)

Question

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The equation provided in choice C has all the reactants in their standard states (solid carbon, half mole of hydrogen gas, and 3 halves mole of chlorine gas) and produces one mole of liquid CHCl3, which is its standard state. Since the given ΔH is the standard enthalpy of formation for CHCl3, it can only be measured under standard conditions, which are captured in choice C. The other choices either have non-standard state reactants or products, or do not produce CHCl3 as the sole product.

Which Equation Represents the Reaction Whose ΔH,represents the Standard Enthalpy