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Let us start of with an assumption: we have ten moles of the given solution. Therefore we have 2 moles of iodine dissolved in 8 moles of benzene.
Molecular mass of benzene=78.
Molality=𝑁𝑜.𝑚𝑜𝑙𝑒𝑠𝑜𝑓𝑖𝑜𝑑𝑖𝑛𝑒/𝑀𝑎𝑠𝑠𝑜𝑓𝑠𝑜𝑙𝑣𝑒𝑛𝑡𝑖𝑛𝑘𝑔
Therefore 8 moles of benzene weighs 78∗8=624grams
Molality=(2∗1000)/624 =3.205
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