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What is the apparent molecular mass of a...

What is the apparent molecular mass of a weak acid HA (molecular mass= 30 g`//`mole) in an aqueous solution, which shows elevation in boiling point by `0.0156^(@)` C.
Given : `K_(a)(HA)=10^(-2),K_(b)(H_(2)O)=0.52 K kg mol^(-1)`

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