How much heat is given off when 32g liquid methanol (ch3oh) at its freezing point changes to solid methanol? (methanol hf=3.16 kj/mol)

a)1.58 kj
b)3.16 kj
c)0.79 kj
d) 0.18 kj

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.