Use PV = nRT and solve for n for gas 1.
Use PV = nRT and solve for n for gas 2.
Add n1 and n2 (call the sum n3) and use PV = nRT substituting n3 and the other new conditions and solve for p.
Remember to keep the units consistent. If you want to use P in kPa then R must be 8.314. Also remember T must be in kelvin.
16.3 L N2 at 25 °C and 125 kPa and 40.7 L O2 at 25 °C and 125 kPa were transferred to a tank with a volume of 5.50 L. What is the total pressure at 45 °C?
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