ThermochemistryHard

Question

Find the bond energy of S−S bond from the following data.

C2H5 − S − C2H5(g): ΔHof = −148 kJ,

C2H5 − S − S − C2H5(g): ΔHof = −202 kJ,

S(g): ΔHof = 222 kJ

Options

A.276 kJ/mol
B.128 kJ/mol
C.168 kJ/mol
D.222 kJ/mol

Solution

$C_{2}H_{5} - S - C_{2}H_{5}(g) + S(g) \rightarrow C_{2}H_{5} - S - S - C_{2}H_{5}(g)$

$\Delta H = ( - 202) - \left\lbrack ( - 143) + 222 \right\rbrack = - 276\text{ kJ} $$$\text{B.E}\text{.}_{S - S} = 276\text{ kJ/mol}$$

Create a free account to view solution

View Solution Free
Topic: Thermochemistry·Practice all Thermochemistry questions

More Thermochemistry Questions

From the following data at 25o C, which of the following statement(s) is/are correct?½H2(g) + ½O2(g)→ OH(g): ΔHo = 42 kJ...From the following data, calculate the enthalpy change (in kJ/mol) for the combustion of cyclopropane(g) at 298 K. The e...For the given reactionsSiO2 + 4HF → SiF4 + 2H2O, ᐃH = -10.17 kcalSiO2 + 4HCl → SiCl4 + 2H2O, ᐃH ...Enthalpy change for the reaction,4H(g) → 2H2 (g) is - 869.6 kJ The dissociation energy of H - H bond is...The standard enthalpies of formation of CO2(g), H2O(l) and glucose(s) at 250C are -400 kJ/mol, -300 kJ/mol & -1300 k...