rigid tank contains 50 kg of saturated liquid water with temperature 90°C. Determine the pressure in the tank in Mpa

A container holds 75.2 liters of Oxygen at 271.4K and a pressure of 3.87 atmospheres.  How much heat is required to raise the temperature of this gas to 296.4K, holding the volume constant?  Give your answer in kJ.  Treat the gas as an ideal gas.  Note:  It is understood that your answer is in units of kilo-Joules, however do not explicitly include units in your answer.  Enter only a number.  If you do enter a unit ("kJ" in this case), you answer will be counted wrong.

A vacuum gage connected to a chamber reads 20 kPa at a location where the atmospheric pressure is 97 kPa. Determine the absolute pressure in the chamber.     What is the absolute pressure in the chamber (in kPa)