Problem with ideal gas law and a spring! Help please!! 1. The problem statement, all variables and given/known data We have a box divided in two parts by a piston without friction, and in one part there are n moles of an ideal gas and a Spring orf constant K and natural longitude L which keeps the piston in equilibrium. According to this, and knowing that the temperature of the gas is T0, find the amount for K. 2. Relevant equations PV=nRT F=-KX E=(KX^2)/2 3. The attempt at a solution I know its (nRTo)/6L^2 because the book has the answers, but I dont know where it came from! Please help!