The molal boiling point elevation constant Kb= 1.26·°C·kgmol−1 for a certain substance X .When 36.1g of urea ((NH2)2CO)) are dissolved in 550.g of X, the solution boils at 109.1°C .Calculate the boiling point of pure X. ?

The boiling point of pure X is 107.73 °C

Explanation:

Step 1: Data given

molal boiling point elevation constant Kb = 1.26 °C /m

Mass of urea = 36.1 grams

Mass of X = 550 grams = 0.550 Kg

Solution boils at 109.1 °C

Molar mass of urea = 60.06 g/mol

Step 2: Calculate moles urea

Moles urea = mass urea / molar mass urea

Moles urea = 36.1 grams / 60.06 g/mol

Moles urea = 0.601 moles

Step 3: Calculate boiling point elevation

ΔT = i*Kb*m

⇒with ΔT = the boiling point elevation = TO BE DETERMINED

⇒with i = the van't Hoff factor for urea = 1

⇒with Kb = the molal boiling point elevation constant = 1.26 °C /m

⇒with m = the molality = moles urea / mass X = 0.601 moles / 0.550 kg = 1.09 molal

ΔT = 1.26 °C/m * 1.09 m

ΔT  = 1.37°C

Step 4: Calculate boiling point of pure X

ΔT = Tb (solution) - Tb (pure solvent)

1.37°C = 109.1 °C - Tb(pure solvent)

Tb pure solvent = 109.1 - 1.37 °C  = 107.73 °C

The boiling point of pure X is 107.73 °C

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but