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hoa [83]
2 years ago
15

Calculate the vapor pressure at 50°c of a coolant solution that is 52.0:48.0 ethylene glycol-to-water by volume. at 50.0°c, the

density of water is 0.9880 g/ml, and its vapor pressure is 92 torr. the vapor pressure of ethylene glycol is less than 1 torr at 50.0°c.
Chemistry
1 answer:
GaryK [48]2 years ago
3 0
<span>If we use 100 mL of solution:
V(ethylene glycol - C</span>₂H₆O₂) = 0,52 · 100 mL = 52 mL.<span>
V(water) = 0,48 · 100 mL = 48 mL.
m(C</span>₂H₆O₂) = 52 mL · 1,115 g/mL = 57,98 g.<span>
n(C</span>₂H₆O₂) = 57,98 g ÷ 62,07 g/mol = 0,934 mol.<span>
m(H</span>₂O) = 48 mL · 0,988 g/mL = 47,424 g.<span>
n(H</span>₂O)  = 45,45 g ÷ 18 g/mol = 2,635 mol.<span>
mole fraction of solvent: 2,635 mol / (2,635 mol + 0,934 mol) =0,73.
Raoult's Law: p(solution) = mole fraction of solvent · p(solvent).
<span>p(solution) = 0,73 · 92 torr = 67,33 torr.</span></span>
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The question is incomplete, the complete question is;

The table above summarizes data given to a student to evaluate the type of change that took place when substance X was mixed with water. The student claimed that the data did not provide enough evidence to determine whether a chemical or physical change took place and that additional tests were needed. Which of the following identifies the best way to gather evidence to support the type of change that occurred when water and Xwere mixed?

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D Measuring the electrical conductivities of X and the mixture of water and X

Explanation:

Unfortunately, I am unable to reproduce the table here. However, from the table,  the temperature of the of the mixture of the solid X and water was 101.6°C. This is above the boiling point of water and way below the temperature of the solid X.

This goes a long way to suggest that there was some kind of interaction between the water and X which accounted for the observed temperature of the system of X in water.

The only way we can be able to confirm if X actually dissolved in water is to measure the conductivity of the water. dissolved solids increase the conductivity of water.

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deff fn [24]

Answer:- 6984 kJ of heat is produced.

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