If the same amount of heat is supplied to samples of 10.0 g each of aluminum, iron, and copper all at 15.0 °c, which sample would reach the highest temperature

The specific heat of aluminum, iron and copper is 0.897 J/g °C, 0.452 J/g °C and 0.385 J/g °C respectively.

The formula that relates specific heat capacity and change in temperature is as follows:

E=m*c*ΔT

Here, E is heat, m is mass, c is specific heat and ΔT is change in temperature.

On rearranging,

c=/frac{E}{m/times / Delta T}

Thus, change in temperature is inversely proportional to change in temperature. Change in temperature will be more for the element with low value of specific heat which is Cu in this case.

Since, the initial temperature is same for all the samples thus, Cu will reach the highest temperature.