A sample of the gas butane, C4H10 of unknown mass is contained in a vessel of unknown volume, V, a pressure of 560.0 torr and at 24.8 C. To this vessel 8.6787 g of Ne are added in such a way that no butane escapes. The total pressure of the vessel is 1420.0torr. Determine the mass of the butane and the volume of the vessel.