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### Question Asked by a Student from EXXAMM.com Team

** Q 3123823741. ** (i) Why air is dense at the sea level? Explain.

(ii) Calculate the total pressure in a mixture

of `4 g` of `O_ 2` and `2 g` of `H_2` confined

to a total volume of `1 L` at `0^o C`

(`R = 0.0821 L atm mol^(-1) `).