Lssnsruer an aqueous mixture or sugar at 15C add 1 bar pressure The astisity' ccefficient sf water is feund te else},' a relation of the farm hm", =...

I need help with this question. I attempted solving the problem using Gibbs Duhem relation for activity coefficients but I was told that the one parameter margules equation is the correct approach. I am stuck

Lssnsruer an aqueous mixture or sugar at 15°C add 1 bar pressure The astisity' ccefficientsf water is feund te else},' a relation of the farm hm“, = tau-x“): where is normalized such that 7“, —t- 1 as r“, -a 1 and A is an empirical constant dependent snly cn temperature. Find an expressien fer n, the activity cuefficient cf sugar henna]- lzed such that 1r: —s l as x", —t 1 [or as I: 5—} d}. The mole fractions 1“, and .r_' refer to waterand sugar. respectively.