If there are 12 x 1023 oxygens in a sample of water, how many grams of hydrogen are in the sample?

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

Salt in oceans comes from and of rocks

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas