The heat capacity C of a substance can be calculated using the formula:q = mcTwhere q is the heat energy in Joules , m is the mass of the substance in grams , c is the specific heat capacity in J/gC , and T is the change in temperature in C .We are given the following values:q = 345 Jm = 15 gT = 12 CWe need to find the specific heat capacity c of the substance. Rearranging the formula to solve for c, we get:c = q / mT Now, plug in the given values:c = 345 J / 15 g 12 C c = 345 J / 180 gCc = 1.92 J/gCThe heat capacity of the substance is 1.92 J/gC.