Question

Equal masses of H2 and He gases are mixed in an evacuated container at 25°c . The fraction of the total pressure exerted by the H2 is

Answer 1

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Answer 2

Given:

• the equal masses of $H_{2}$ and He gasses are mixed in an evacuated container at 25°C so we have a temperature 25°

To Find: The fraction of the total pressure exerted by the $H_{2}$?

First we will find the moles because as we know that

                              Partial pressure  = Total pressure × mole friction

Let's find the partial pressure of He and for that, we should have known the mole fraction.

                                                       $XHe = \frac{\frac{W}{4} }{\frac{W}{4} +\frac{W}{2} }$

                                                                 = $\frac{1}{8}$

                                                         $P_{He} = P_{t}$ × $X_{He}$

we have to find the fraction of the total pressure that is the ratio of total pressure and mole friction that will be

                                                           $\frac{P_{He} }{P_{t} } = \frac{1}{8}$

hence the friction of the total pressure exerted by the $H_{2}$ is 1/8