Water is used in car radiators in winter season in Thailand glycol is added to water so that water MI note 3 is assuming ethylene glycol to be non-volatile calculate minimum amount of Ethylene glycol that must be added 26 kg of water to prevent it from freezing at minus 0.30 degree Celsius
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Given:
The mass of water, W = 26 kg = 26000 kg
The freezing point of the solution, Tf = - 0.3 °C
To Find:
The mass of ethylene glycol required to depress the freezing point by -0.3 °C.
Calculation:
- The molar mass of ethylene glycol = 62 gm
- The depression in freezing point is given as:
ΔTf = Kf × m
⇒ T⁰ - Tf = Kf × (w × 1000)/(M.wt × W)
⇒ 0 - (-0.3) = 1.86 × (w × 1000)/(62 × 26000)
⇒ 0.3 = 1.86 × w / (62 ×26)
⇒ w = 0.3 × 62 ×26 / 1.86
⇒ w = 483.6/1.86
⇒ w = 260 gm
- So, 260 gm of ethylene glycol must be added to 26 kg of water to prevent it from freezing at -0.30 °Celsius.
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