Water can change it's form, but can water possibly lose it's form?

Calculate the number of moles of ethane in 100 grams

When a septic tank backs up a goes in to clean it out

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