Question

Hydrogen reacts with chlorine to form hydrogen chloride (HCl (g), mc012-1.jpgHf = –92.3 kJ/mol) according to the reaction below.
Which statement is correct?
The enthalpy of the reaction is –184.6 kJ, and the reaction is exothermic.
The enthalpy of the reaction is –184.6 kJ, and the reaction is endothermic.
The enthalpy of the reaction is 184.6 kJ, and the reaction is endothermic.
The enthalpy of the reaction is 184.6 kJ, and the reaction is exothermic.

Answer 1

Given:

H2(g) + Cl2 (g) → 2HCl (g)

To determine:

The enthalpy of the reaction and whether it is endo or exothermic

Explanation:

Enthalpy of a reaction is given by the difference between the enthalpy of formation of reactants and products

ΔH = ∑nHf (products) - ∑nHf (reactants)

      = [2Hf(HCl)] - [Hf(H2) + Hf(Cl2)] = 2 (-92.3) kJ = - 184.6 kJ

Since the reaction enthalpy is negative, the reaction is exothermic

Ans: The enthalpy of reaction is -184. kJ and the reaction is exothermic

Answer 2

The correct statements among the given statements is ''The enthalpy of reaction is -184. kJ and the reaction is exothermic''

What is Enthalpy of reaction ?

The Heat of Reaction (also known and Enthalpy of Reaction) is the change in the enthalpy of a chemical reaction that occurs at a constant pressure.

It is a thermodynamic unit of measurement useful for calculating the amount of energy per mole either released or produced in a reaction

Given reaction ;

H₂ (g) + Cl₂ (g) → 2HCl (g)

To determine:

The enthalpy of the reaction and whether it is endo or exothermic

Enthalpy of a reaction is given by the difference between the enthalpy of formation of reactants and products

That is ;

ΔH = ∑nHf (products) - ∑nHf (reactants)

     = [2Hf(HCl)] - [Hf(H₂) + Hf(Cl₂)]

     = 2 (-92.3) kJ

     = - 184.6 kJ

Since the reaction enthalpy is negative, the reaction is exothermic

Hence, The correct statements among the given statements is ''The enthalpy of reaction is -184. kJ and the reaction is exothermic''

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