The amount of heat needed to increase the temperature of a substance by [tex]\Delta T[/tex] is given by
[tex]Q= mC_s \Delta T[/tex]
where m is the mass of the substance, Cs is its specific heat capacity and [tex]\Delta T[/tex] is the increase of temperature.
If we re-arrange the formula, we get
[tex]C_s = \frac{Q}{m \Delta T} [/tex]
And if we plug the data of the problem into the equation, we can find the specific heat capacity of the substance:
[tex]C_s = \frac{1495 J}{(351 g)(66.0^{\circ}C-55.0^{\circ}C)}=0.39 J/g^{\circ}C [/tex]
