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} $$$\text{B.E}\text{.}_{S - S} = 276\text{ kJ/mol}$$

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