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Q.

Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75g of benzene.

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Detailed Solution

Molar mass of C2H4O2:
12×2+1×4+16×2=60gmol1
Moles of C2H4O2=2.5g60gmol1 = 0.0417mol
Mass of banzene in Kg = 75g/1000gkg1
=75×103kg
 Molality of C2H4O2 molesof C2H4O2kg of benzene 
=0.0417mol×1000gkg175g=0.556molkg1

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Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75g of benzene.