For the simple 1:1 reaction A(g)⇌B(g), the equilibrium constant at a certain temperature is K=25. A sample initially contains only A at a pressure of 1.0 atm. Approximately what percentage of the original A remains unconverted at equilibrium?
a) About 20 % of A remains unconverted.
b) About 96 % of A remains unconverted.
c) About 4 % of A remains unconverted.
d) About 50 % of A remains unconverted.