Which of the following statements best describes the energy transformation that occurs when a log burns? Mechanical energy chang
2 answers:
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Answer : The correct option is, (1) lower
Explanation :
Formula used for lowering in freezing point :
where,
= change in freezing point
= freezing point constant
m = molality
i = Van't Hoff factor
According to the question, we conclude that the molality of the given solutions are the same. So, the freezing point depends only on the Van't Hoff factor.
Now we have to calculate the Van't Hoff factor for the given solutions.
(a) The dissociation of will be,
So, Van't Hoff factor = Number of solute particles = 1 + 1 = 2
(b) The dissociation of will be,
So, Van't Hoff factor = Number of solute particles = 1 + 2 = 3
The freezing point depends only on the Van't Hoff factor. That means higher the Van't Hoff factor, lower will be the freezing point and vice-versa.
Thus, compared to the freezing point of 1.0 M at standard pressure, the freezing point of 1.0 M
at standard pressure is lower.
<u>Answer:</u> The new volume of the balloon will be 583.5 L
<u>Explanation:</u>
To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.
The equation follows:
where,
are the initial pressure, volume and temperature of the gas
are the final pressure, volume and temperature of the gas
We are given:
Putting values in above equation, we get:
Hence, the new volume of the balloon will be 583.5 L