What are the reactants in the first word equation above.

What is the number of moles in 15.0 g ash3?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added