A system containing 10 mol of an ideal gas is maintained at thermal equilibrium (at the same temperature) as its surroundings, at a temperature of 50 °C. It then has 100 kJ of heat transferred to it, which causes it to expand isothermally against a constant pressure of 1 atm. It is then isothermally compressed back to its initial volume. What is its change in enthalpy over the entire process? Express your answer in units of kJ.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.