Two elements 'A' and 'B' form compounds having molecular formulae AB2 – InterviewSolution

1.	Two elements 'A' and 'B' form compounds having molecular formulae AB2 and AB4 when dissolved in 20.0 g of benzene, 1.0 g of AB2 lowers the freezing pioint by 2.3∘C whereas 1.0 g of AB4 lowers the freezing point by 1.3∘C. The molal depression constant for benzene is 5.1 K kg mol−1. Calculate the atomic masses of A and B.
Answer» Two elements 'A' and 'B' form compounds having molecular formulae $A B_{2}$ and $A B_{4}$ when dissolved in $20.0 g$ of benzene, $1.0 g$ of $A B_{2}$ lowers the freezing pioint by ${2.3}^{\circ} C$ whereas $1.0 g$ of $A B_{4}$ lowers the freezing point by ${1.3}^{\circ} C$ . The molal depression constant for benzene is $5.1 K k g m o l^{- 1}$ . Calculate the atomic masses of A and B.

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