A container contains mixture of He and Ne gases at certain temperature. He is 20 % by mass of mixture. What is the ratio of partial pressure of Helium to Neon ?

Step-by-step solution

Let the total mass of the mixture be 100 g. Mass of He = 20 g Mass of Ne = 80 g Molar mass of He = 4 g/mol Molar mass of Ne = 20 g/mol Number of moles of He, n_ He = 20 4 = 5 Number of moles of Ne, n_ Ne = 80 20 = 4 According to Dalton's law of partial pressures, the ratio of partial pressures is equal to the ratio of number of moles. P_ He P_ Ne = n_ He n_ Ne = 5 4 Answer: 5:4