What is the energy change when the temperature of 14.5 grams of solid tin is decreased from 39.8 °C to 24.7 °C ?

Answer 1

q = mC∆T

q = heat = ?

m = mass = 14.5 g

C = specific heat of tin = 0.21 J/g/degree (you should have been given this, or look it up)

∆T = change in temperature = 39.8 - 24.7 = 15.1 degrees

q = (14.5 g)(0.21 J/g/deg)(15.1 degree) = 46.0 J and this is heat energy LOST so it would have a negative sign