Question

The temperature at a hill station is -10 Celsius. will it be suitable to add ethylene glycol to water in the radiator so that solution is 30% by mass​

Answer 1

Answer:

No, it will not be suitable to add ethylene glycol to water in the radiator because the solution will start getting freeze at -4.424 °C and will not last as in liquid state till -10 °C temperature.

Explanation:

Temperature at hill station = -10° C = 263 K

30% by mass glucose solution. Molality of the solution will be :

$m=\frac{30 g}{180.15 g/mol\times 0.070 kg}=2.3789 mol/kg$

Depression in freezing point:

$\Delta T_f=K_f\times m$

$\Delta T_f=1.86 K kg/mol\times 2.3789 mol/kg=4.424 K$

Freezing point of solution =$T_f$

$\DeltaT_f=T-T_f=$

$T_f=273K-4.424 K=268.576 K$

The freezing point of the solution = -4.424 °C

No, it will not be suitable to add ethylene glycol to water in the radiator because the solution will start getting freeze at -4.424 °C and will not last as in liquid state till -10 °C temperature.