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## Homework Statement

At very low temperatures, the molar specific heat of many substances varies as the cube of the absolute temperature: C=k*(T^3/To^3),

which is sometimes called Debye's law. For rock salt, To= 281K and k= 1940 J/mol*K

Determine the heat needed to raise 2.40 mol of salt from 30.0K to 50.0K .

## Homework Equations

I don't know if this equation applies to solid . Q=nC*ΔT

## The Attempt at a Solution

I know ΔT is 20, it seems to me that the only unknown for this question is T.

I tried to plug in 30 OR 50 into T, but I got the wrong answer.