The enthalpy of S−S bond from the following data is:
( i ) C2H5−S−C2H5(g);ΔfHo=−147.2 kJ / mol
( ii ) C2H5−S−S−C2H5(g);ΔfHo=−201.9 kJ / mol
( iii ) S(g);ΔfHo=−222.8 kJ / mol
A
124.5 kJ / mol
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B
887.5 kJ / mol
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C
967.5 kJ / mol
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D
277.5 kJ / mol
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Solution
The correct option is D 277.5 kJ / mol Given; (i)4C(s)+5H2(g)+S(s)→C2H5−S−C2H5(g)ΔfH=−147.23kJ/mol (ii)4C(s)+5H2(g)+2S(s)→C2H5−S−S−C2H5(g)ΔfH=−201.92kJ/mol