Choose the correct option for the total pressure (in atm.) in a mixture of 4 g O_2 and 2 g H_2 confined in a total volume of one litre at 0°C is : [Given R = 0.082 L atm mol^-1K^-1, T = 273 K]
2.518
2.602
25.18
26.02
Moles of O_2 = 4/32 = 1/8. Moles of H_2 = 2/2 = 1. Total moles n_t = 1/8 + 1 = 9/8. Using PV = nRT, P = (n_t R T) / V = (9/8 0.082 273) / 1 = 25.18 atm.
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