2 moles of propane reacts with 8 moles of oxygen in a combustion reaction. How many moles of carbon dioxide are formed? How much of the excess reactant is left over?

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.