Question

A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is ______ bar. (Nearest Integer)

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Answer 1

A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is 2 bar.

Explanation:

40% Hydrogen contains 40g Hydrogen gas and 60g of Oxygen gas.

`n_("H"_2) = 40/2` = 20

`n_("O"_2) = 60/32` = 1.8

`chi_("H"_2) = n_("H"_2)/(n_"Total") = 20/(20 + 1.8) = 20/21.8` = 0.92

`p_("H"_2) = chi_("H"_2) * p_"Total" = 0.92 xx 2.2 = 2.02` bar i.e. 2 bar