What will be the pressure of the gaseous mixture when 0.5 L of `H_(2)` at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at `27^(@)C`?

Explanation

Suppose the partial pressures of `H_2 and O_2` in the gas mixture are `p_1 and P_2` respectively.
For `H_2 " gas : " P_1 V_1 = P_2 V_2`
`0.8 xx 0.5 = P_1 xx 1 or P_1 = (0.8 xx 0.5)/1 = 0.4` bar
For `O_2 " gas : " 0.7 xx 2.0 = P_2 xx 1`
or `P_2 = (0.70 xx 2.0)/1 = 1.4` bar
Hence, the total pressure of the gas mixture = `0.4 +1.4 = 1.8` bar