Question

After dissolving 15 grams of a substance in 150 grams of water, the freezing point of water resulted in 1.2 degrees Celsius. Find the molecular weight of the substance. The Molal Awman constant of water is 1.86​

Answer 1

Answer:

molecular mass of a substance if 22.5 g dissolved in 250 g of water ... The molecular mass is 180 u. ... The formula for freezing point depression is ... Kf = the molal freezing point depression constant of the solvent ... We can rearrange the formula to get ... m=0.930°C 1.86°C ⋅kg⋅mol-1=0.500 mol⋅kg-1.