# Question #f9d73

##### 1 Answer

You'd need **4.7 kJ** of heat to convert that much solid aluminium to fully molten at its melting point.

You start with a sample of solid aluminium at

*Go from solid at*#580.0^@"C"# *to solid at*#660.4^@"C"# ;

You know that

Plug in your values and solve for

*Go from solid at*#660.4^@"C"# *to molten at*#660.4^@"C"# .

This time, the sample is undergoing a phase change, i.e. it goes from solid to molten. This transition happens *at constant temperature*, so the equation you're going to use is

Once again, plug your values into the equation and solve for

The total heat required will be equal to

Rounded to two sig figs and expressed in kJ, the answer will be

**SIDE NOTE** *The + sign shows that the heat is supplied to the metal.*