What mass of the ethanol is she freezing?

In summary, the conversation discusses the process of freezing ethanol by removing heat energy and the equations needed to determine the mass of ethanol being frozen. The specific heat capacity of ethanol, as well as its melting and freezing temperatures, are necessary information for solving this problem.
  • #1
A technician freezes some ethanol by removing 9.53x10^4 J of heat energy from it at its melting point. What mass of the ethanol is she freezing?
 
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  • #2


MacoRules94 said:
A technician freezes some ethanol by removing 9.53x10^4 J of heat energy from it at its melting point. What mass of the ethanol is she freezing?

What equation do you think you need to use here? What information do you think you need to have to work out this problem?
 
  • #3


No idea
 
  • #4


MacoRules94 said:
No idea

Wouldn't the technician have to lower the temperature to the freezing point? Do you know an equation that related heat energy to temperature?
 
  • #6


MacoRules94 said:
No ida

Do you know the equations Q=mcΔT and Q=ml ?
 
  • #7


Yes

Q = Mas x (umm, 4200 for water :) ) x (Tf - To)
 
  • #8


You will need to get the specific heat capacity of ethanol, the melting and freezing temperatures. Look those up.
 

1. How do you calculate the mass of ethanol that is being frozen?

The mass of ethanol being frozen can be calculated by using the density of ethanol, which is 0.789 g/mL, and the volume of the ethanol being frozen. The formula for calculating mass is: mass = density x volume. Therefore, if the volume of ethanol being frozen is 500 mL, the mass would be 0.789 x 500 = 394.5 grams.

2. What is the freezing point of ethanol and how does it affect the mass?

The freezing point of ethanol is -114.1 degrees Celsius. When ethanol is frozen, it expands slightly, which can affect the mass. However, the change in mass is minimal and can be neglected for most practical purposes.

3. Why is it important to know the mass of the ethanol being frozen?

Knowing the mass of the ethanol being frozen is important for various reasons. It can help in determining the amount of energy required to freeze the ethanol, as well as the amount of space it will take up when frozen. It can also be useful in calculating the final temperature of the ethanol after freezing.

4. How does the temperature of the ethanol affect its freezing mass?

The temperature of the ethanol does not have a significant effect on its freezing mass. As long as the temperature is below the freezing point of -114.1 degrees Celsius, the mass will remain the same. However, if the temperature is above the freezing point, the ethanol will not freeze and the mass will remain constant.

5. Can the freezing mass of ethanol be affected by impurities?

Yes, the presence of impurities in ethanol can affect its freezing mass. This is because impurities can lower the freezing point of the ethanol, causing it to freeze at a lower temperature. This can result in a change in mass, as well as other properties of the ethanol.

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