Question

Calculate the heat released when 454 grams of steam at 100 degrees C condenses.

Answer 1

The heat released when 454 grams of steam at 100 degrees C condenses is 245,160 calories, calculated by multiplying the mass of steam (454 g) by the heat of vaporization of water (540 cal/g).

Step-by-step explanation:

To calculate the heat released when 454 grams of steam at 100 degrees C condenses, we use the heat of vaporization of water, which is the amount of heat required to convert one gram of liquid water into vapor or vice versa. The heat of vaporization of water is approximately 540 calories per gram (cal/g) at 100°C. Thus, to find the total heat released by the condensation of 454 grams of steam, we multiply the mass of the steam by the heat of vaporization:

Heat released = Mass of steam x Heat of vaporization

Heat released = 454 g x 540 cal/g

Heat released = 245,160 calories

This value represents the total amount of energy released into the surroundings when the steam at 100 degrees Celsius condenses to liquid water at the same temperature.

Answer 2

1026.05 kJ

Step-by-step explanation:

• The Quantity of heat is calculated by multiplying the mass of a substance by specific heat capacity and the change in temperature.
• However, condensation takes place at a constant temperature.
• Therefore, Quantity of heat is calculated by multiplying mass by the latent heat of vaporization.

• That is; Q = m × Lv

In this case we are given;

Mass of steam as 454 g

To calculate the amount of heat released we must know the value of latent heat of vaporization;

The latent heat of vaporization of steam is 2260 J/g

Therefore;

Heat released, Q = 454 g × 2260 J/g

=1026040 Joules

But, 1000 joules = 1 kilo-joules

Thus, Q = 1026.04 kJ

Hence, the amount of heat released is 1026.05 kJ