Question

How much heat energy is given out when 500g of steam at 100 degrees celcius condenses to water at 100 degrees celcius

Answer 1

When 500g of steam at 100 degrees Celsius condenses to water at 100 degrees Celsius, 270,000 calories of heat energy are released.

Step-by-step explanation:

To calculate the amount of heat energy released when 500g of steam at 100°C condenses to water at 100°C, we need to use the heat of vaporization of water. The heat of vaporization of water is 540 cal/g. First, we find the amount of heat energy required to vaporize the 500g of steam:

Heat energy = mass × heat of vaporization = 500g × 540 cal/g = 270,000 cal

Therefore, when 500g of steam condenses to water, 270,000 calories of heat energy are released.

Answer 2

Step-by-step explanation:

How much thermal energy is released when 500g of steam at 100° C condenses into water and cools to 50°C

Givens: m=0.5 kg

t = 50

c = 2.010

Qtotal = Q1 + Q2

Qtotal = QmcΔt + mLv

Qtotal = (0.5kg)(2.010)(50) + (0.5)(2.3*10^6)

Qtotal = 1.15 * 10^6

The book says that the answer is 1.3*10^6?

What did I do wrong here?