2. How many moles of copper, Cu, are needed to react with sulfur, S, to produce 0.25 moles of copper(I) sulfide,
Cu S, according to the following reaction?
2 Cu + S Cus
Known:
Unknown:
How many moles of sodium, Na, are needed to react with sulfuric acid, H, SO,, to produce 3.75 moles of sodium

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.