What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting point? A. 20.0J B. 83.6J C. 6680J D. 45,200J How do you solve
1 Answer
The answer is (C)
Explanation:
In order to be able to answer this question, you need to know the value of water's enthalpy of fusion,
As you know, a substance's enthalpy of fusion tells you how much heat is needed to melt
Simply put, a substance's enthalpy of fusion tells you how much heat is required to get
Water's enthalpy of fusion is approximately equal to
#DeltaH_f = 334"J"/"g"#
http://www.engineeringtoolbox.com/latent-heat-melting-solids-d_96.html
This tells you that in order to melt
In your case, you have
Therefore, you can say that
#20.0 color(red)(cancel(color(black)("g ice"))) * "334 J"/(1color(red)(cancel(color(black)("g ice")))) = "6680 J"#
are needed to melt
Therefore, (C)