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Question: Energy required to dissociate 16 g $O_{2(g)}$ into free atoms is $x$ kJ. The value of bond enthalpy ...

Energy required to dissociate 16 g O2(g)O_{2(g)} into free atoms is xx kJ. The value of bond enthalpy of O=O bond is _______.

A

4x kJ

B

x2\frac{x}{2} kJ

C

2x kJ

D

16x kJ

Answer

2x kJ

Explanation

Solution

Molecular mass of O2O_2 = 32 g/mol, so 16 g of O2O_2 = 0.5 mole. If x kJ dissociates 0.5 mole of O2O_2 then energy required per mole (bond enthalpy) is

Bond enthalpy=x0.5=2x kJ/mol.\text{Bond enthalpy} = \frac{x}{0.5} = 2x \text{ kJ/mol.}