The amount of heat Q needed to increase the temperature of a substance by [tex]\Delta T[/tex] is given by [tex]Q= m C_s \Delta T[/tex] where m is the mass of the substance, and [tex]C_s[/tex] is its specific heat capacity.
In our problem, we have: m=75.0 g [tex]\Delta T=250^{\circ}C-150^{\circ}C=100^{\circ} C[/tex] [tex]C_s=0.13 J/g ^{\circ}C[/tex] so, substituting these numbers, we get the amount of heat needed: [tex]Q=(75.0 g)(0.13 J/g^{\circ}C)(100 ^{\circ}C)=975 J[/tex]
