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I am confused about when to use q=n(deltaH) vs q=mc(deltaT). I am doing problem 4C.11 in the 7th edition textbook and it asks how much heat is needed to convert 80 g ice at 0 degrees C into liquid water at 20 degrees C, and I don't understand why q=n(deltaH) is used for the ice calculation and why q=mc(deltaT) is used for water.
Hey! The reason we use q=n(deltaH) for ice is because it is changing phases from a solid to liquid, but the temperature of ice is not changing since 0 degrees Celsius is the freezing point. q=mc(deltaT) is used to calculate the heat required for a temperature change, which in this case, water changes from its 0 degrees to its new temperature of 20 degrees Celsius.
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