`4 g` hydrogen is mixed with 11.2 litre of He at (STP) in a container of volume 20 litre. If the final temperature is `300 K`, find the pressure.
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4 gm Hydrogen =2 moles Hydrogen and 11.2l. He at S.T.P `=1//2` mole of He `P=P_(H)=P_(He)=(n_(H)+n_(He))(RT)/V=(2+1//2)(8.3xx(300K))/((20xx10^(-3))m^(3))=3.11xx10^(5)N//m^(2)`
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