A container holds a sample of helium gas that exerts a pressure of 4.5 atm on the container. A sample of nitrogen gas is added to the container, and the total pressure exerted on the container
increases to 7.0 atm.
What is the partial pressure of the nitrogen gas?
A.
2.5 atm
B. 4.5 atm
. C.
7.0 atm
D.
14.0 atm

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