Question

How many grams of ammonium chloride (NH4Cl) would be required to make a saturated solution in 1000 grams of water at 50 degrees Celsius?
0 degrees Celsius - 90 g/100 mL
10 degrees Celsius - 70 g/100 mL
20 degree Celsius - 55 g/100 mL
30 degree Celsius - 45 g/100 mL
40 degrees Celsius - 35 g/100 mL
50 degrees Celsius - 29 g/100 mL

Answer 1

Since,
1000 grams of water = 1000 mL of water
So, 
At any of the given temperature:
1000 mL = 10 x 100 mL

moles of NH4Cl = 53.5/53.49
                          = 1.0 m
                          = 1.0 mol/Kg
Delta T = 2 x 1.86 x 1.0
             = 3.72 c
             = - 3.72 °C