A balloon full of air has a volume of 1.00L at a temperature of 23 °C. What is the balloon's volume at 33°C? 1.03L
How do I solve this?

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