400 mL of hydrogen gas at a pressure of 300 mm Hg and 200 mL of hydrogen chloride gas at a pressure of 600 mm Hg are mixed in a one litre evacuated flask. Calculate the resulting pressure (in mm Hg) of the mixture at the same temperature.
Open in App
Solution
Mole after mixing = Mole before mixing nT=nH2+nHCl (where, nT = total mole of mixture) From the ideal gas equation, PV=nRT n=RTPV Since, nT=nH2+nHCl So PTVT/RT=PH2VH2/RT+PHClVHCl/RT PT×1000=300×400+600×200 PT=240mm Hg