Aradioactive nuclide has 53 protons and 78 neutrons. which is the symbol of this nuclide?

What does x represent in the formula for the compound xcl4?

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius

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