The Standard Gibbs Energy of Reaction for the Thermal Decomposition

The standard Gibbs energy of reaction for the thermal decomposition of ammonium chloride, NH₄Cl
NH₄Cl(s) ∏ NH₃(g) + HCl(g)
Is +35.0 kJ mol^-1 at 225 °C. Calculate the partial pressure of ammonia, NH₃, gas produced when ammonium chloride is allowed to decompose at a pressure of 1 bar at this temperature.

A) 1460 Pa
B) 21.2 Pa
C) 8.66 Pa
D) 21.3 kPa