Calculate the Br-Br bond enthalpy given the standard enthalpies of formation for Br₂(g) and Br(g),30.7 and 112 kJ.mol^-¹,Respectively. A) 193 kJ.mol^-¹ B) 255 kJ.mol^-¹ C) 143 kJ.mol^-¹ D) 81 kJ.mol^-¹ E) 30.7 kJ.mol^-¹

Question

Quizplus · Accepted Answer

We can use the equation:

ΔH°f(Br2(g)) = 2ΔH°f(BrSbB(g)) - 2ΔH°f(SbB(g))

where ΔH°f is the standard enthalpy of formation.

Substituting the given values, we get:

112 = 2(30.7) - 2ΔH°f(Br-Br)

Solving for ΔH°f(Br-Br), we get:

ΔH°f(Br-Br) = 193 kJ/mol

Therefore, the answer is A.

Calculate the Br-Br Bond Enthalpy Given the Standard Enthalpies of Formation