Question

Equal masses of H2 and N2 are mixed in the container at 25°C.fraction of total pressure
exerted by H2 is​

Answer 1

Given:

• The mass of H₂ taken is equal to the mass of the N₂ taken = W g
• Molar mass of H₂ = 2 g/mol
• Molar mass of N₂ = 28 g/mol

To find:

The fraction of the total pressure exerted by H₂

Solution:

• According to Dalton's law of partial pressure of gases, the fraction of total pressure exerted by a gas in a mixture of gases is equal to the mole fraction of the gas.
• Moles of H₂ (n1) = W/2
• Moles of N₂ (n2) = W/28
• Total number of moles (n) =  n1 + n2 = (W/2) + (W/28) = 15W/28.
• Mole fraction of H₂ = n1/n = (W/2)/(15W/28) = 14/15

Answer:

The volume of water (V) that needs to be added to the mixture of the two solution such that the resulting molarity is 3M = 14/15.