A fumarole (Latin fumus, smoke) is an opening in Earth\\\'s crust, often in the

Question

A fumarole (Latin fumus, smoke) is an opening in Earth's crust, often in the neighborhood of volcanoes, which emits steam and other gases such as carbon dioxide. The steam temperature may be as high as 200 oC. There are close to four thousand fumaroles within the boundaries of Yellowstone National Park, where the average temperature during the winter is –10 oC. Which of these graphs best represents the energy transfer between the steam and the environment as the ejected water cools down and reaches equlibrium with its surroundings?

Explanation / Answer

For this item, you need to know the heat of fusion and heat of vaporization of water. Since the heat of fusion is less than the heat of vaporization, the answer is either A or C. But you have to figure out, for each transformation if the energy change is positive or negative. Then you can eliminate one of the choices.

here the correct option is A as it shows that the for each transformation enthalpy change is negative so we neglect option C here.

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