A container with a volume of 1.500 L was evacuated and then filled at low temperature with 0.0500 mol liquid dinitrogen tetroxide, N₂O₄. As the temperature was raised, this substance formed nitrogen dioxide, NO₂:

N₂O₄(g) ⇌ 2NO₂(g)

If the pressure of this reaction mixture at equilibrium at 25.0°C was 0.971 atm, what was the total moles of gas in this mixture? What are the moles of NO2 and moles of N₂O₄? What are the partial pressures of NO₂ and N₂O₄? What is K p at 25.0°C?