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# Two elements A and B form compounds having molecular formula $AB_2$ and $AB_4$. When dissolved in 20g of benzene, 1g of $AB_2$ lowers the freezing point by 2.3 K, whereas 1.0 g of $AB_4$ lowers it by 1.3K. The molar depression constant for benzene is 5.1 K kg $mol^{−1}$. Calculate the atomic mass of A and B.

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