If 1 kilogram of solid X at -20C gains 40 kilojoules of energy, its temperature will be ____ 1) -120 2) -80 3) -20 4) 80 Given: Specific heat of solid: 0.4, heat of fusion: 60, melting point:-20, So I did: mL+40=0.4(T+20) --> 60+40=0.4(T+20), T=230. But no choice for that. Then I have one question, is there any way to tell if a substance is solid or liquid or gas, in other words, what phase? because there is a diagram with temperature on y-axis, time on x-axis, so how can I tell what phase a certain point is. Thank you.