how to calculate mass percent given molality?
['Consider a binary compound AB.', 'Let M be the molality of the compound .', 'Let, A be the solute ,and molar mass of A be Ma.', 'Then from the Molality of the compound ,moles of A per kg of B, ... ', 'So, multiply the Molality with molar mass of A ,', 'You will get mass of A per kg mass of B .']