# Question #30924

##### 1 Answer

Here's what I got.

#### Explanation:

In order to be able to answer this question, you need to know the *enthalpy of fusion*,

#DeltaH_"fus" = "333.55 J g"^(-1)#

https://en.wikipedia.org/wiki/Enthalpy_of_fusion

Now, the enthalpy of fusion is a measure of how much heat is needed to melt *liquid water* at its melting point.

In other words, the enthalpy of fusion tells you how much heat is needed to make *solid* *liquid* phase change at

In order to calculate the heat needed to melt **conversion factor**

#51.0 color(red)(cancel(color(black)("g"))) * "333.55 J"/(1color(red)(cancel(color(black)("g")))) = "17011 J"#

Rounded to three **sig figs** and expressed in *kilojoules*, the answer will be

#color(green)(bar(ul(|color(white)(a/a)color(black)("heat needed " = " 1.70 kJ")color(white)(a/a)|)))#