Partial Pressure Problem: Calculating Remaining Reactant using Avogadro's Law

[elliotyang]

The gas phase decomposition of ethylamine produces ethane and ammonia according to the following equation:-

C₂H₅NH₂ (g) → C₂H₄ (g) + NH₃ (g)

The following total pressures were found for this reaction at 500°C with an initial pressure of pure ethylamine equal to 55 mm Hg.

Ptotal (mm Hg) time (min)
55 0

64 2

72 4

89 10

93 12


If P₀ is the initial pressure of reactant and ptotal is the total pressure at time t, show how the the partial pressure of reactant remaining at time t can be found.

Can anyone give hint to me how to start to solve this question?

is it i have to apply avogadro's law?

 

[Borek]

is it i have to apply avogadro's law?

That, plus stoichiometry.