At 27^ C , a closed vessel contains a mixture of equal weights of helium (mol. wt. =4), methane (mol, wt. =16) and sulphur dioxide (mol. wt. = 64). The pressure exerted by the mixture is 210 ~mm . If the partial pressures of helium, methane and sulphur dioxide are p₁, p₁ and p₃ respectively, which one of the following is correct?

Step-by-step solution

Let us suppose each gas has 64 ~g weight. array |c|c|c|c|c| Gases & Weight & array c wt./at. wt. array & array c No. of moles array & array c Partial pressure array He & 64 & 64 4 & 16 & 16 21 210=160 ~mm (P₁ ) CH ₄ & 64 & 64 16 & 4 & 4 21 210=40 ~mm (P₂ ) SO ₂ & 64 & 64 64 & 1 & 1 21 210=10 ~mm (P₃ ) array p₁>p₂>p₃