How Many Kilojoules of Heat are Needed to Convert Water to Steam?

How many kilojoules of heat are needed to convert 175 grams of water to steam at 100 ºC?

A. 396,500 kilojoules

Answer:

To convert 175 grams of water to steam at 100 ºC, 396,500 kilojoules of heat are needed.

Explanation: When water is converted to steam, it undergoes a phase change that requires a specific amount of heat energy known as the latent heat of vaporization. In this case, 1 gram of water requires 2260 kilojoules of heat to turn into steam.

Therefore, to find out how much heat is needed to convert 175 grams of water, we can use the given conversion factor:

175 grams * 2260 kJ/gram = 396,500 kilojoules

This means that 396,500 kilojoules of heat are needed to convert 175 grams of water into steam at 100 ºC. This process is essential in various applications such as power generation and industrial processes where steam is used for its energy transfer capabilities.