Question

A saturated solution of ammonium sulfate, (NH4)2SO4, in water at 30 °C contains 78.0 g (NH4)2SO4 per 100.0 g H2O. What is the molality of this solution?

Answer 1

molality = moles of ammonium sulfate /Kg of solvent

moles of ammomium sulfate = gram/ molecular weight =78/132.6 =

100 gram of water = 0.1Kg o water
plug both values in the first equation u get it

Answer 2

thanks mate, just figured it out a few min ago. Calculated it and it came out to be 5.9M.

Answer 3

yaaa 5.88~ 5.9M ur right