Equal weights of CH4 and O2 are mixed in an empty container at 25°C.

1.	Equal weights of CH4 and O2 are mixed in an empty container at 25°C. The fraction of the totalpressure exerted by oxygen is:(C) 2/3(D)2/3 x 273/298
Answer» If x g of both oxygen and methane are mixed then : Mole of oxygen = x/32 Mole of methane = x/16 ⇒ mole fraction of oxygen = (x/32)/(x/32 + x/16) = 1/3 According to law of partial pressure Partial pressure of oxygen (po2) = mole-fraction × total pressure ⇒ Po2/p = 1/3

Equal weights of CH4 and O2 are mixed in an empty container at 25°C. The fraction of the totalpressure exerted by oxygen is:(C) 2/3(D)2/3 x 273/298

Answer»

If x g of both oxygen and methane are mixed then :

Mole of oxygen = x/32

Mole of methane = x/16

⇒ mole fraction of oxygen = (x/32)/(x/32 + x/16) = 1/3

According to law of partial pressure

Partial pressure of oxygen (po2) = mole-fraction × total pressure

⇒ Po2/p = 1/3