Question

Review Constants Periodic Table The total pressure of a mature of oxygen and hydrogen is 300 m. The more s measured at the same as and was the ongna mature tedand the warmoved. There is pure hydrogen anders a per e n - Part A What was the composition of the orginal mixture in more percent Express your answers in percent to three significant figures separated by a comma 130 AED ROB ? mole percent O mele percent Submit

Answer 1

Part A : mole percent O₂, mole percent H₂ = 31.2 , 68.8 %

Explanation

Given : Total pressure = 3.00 atm

excess hydrogen pressure = 0.193 atm

pressure of hydrogen and oxygen which forms water = (Total pressure) - (excess hydrogen pressure)

pressure of hydrogen and oxygen which forms water = (3.00 atm) - (0.193 atm)

pressure of hydrogen and oxygen which forms water = 2.807 atm

The balanced equation for formation of water is : 2 H₂ (g) + O₂ (g) $\rightarrow$ 2 H₂O (g)

Let pressure of O₂ = x

Then, pressure of H₂ = 2x

total pressure = (pressure of O₂) + (pressure of H₂)

total pressure = x + 2x

total pressure = 3x

total pressure = pressure of hydrogen and oxygen which forms water

3x = 2.807 atm

x = (2.807 atm) / 3

x = 0.9357 atm

pressure of O₂ = x = 0.9357 atm

mole fraction O₂ = (pressure of O₂ / Total pressure)

mole fraction O₂ = (0.9357 atm / 3.00 atm)

mole fraction O₂ = 0.312

mole percent O₂ = mole fraction O₂ * 100

mole percent O₂ = 0.312 * 100

mole percent O₂ = 31.2 %