P=16 bars and T = 40 ^oC

Since P = 16 and T = 40 are both round values, there are two ways to answer this:

• Go to the pressure table at P = 16 bars.
• Compare T = 40 to T_boil = 41.03. 
• Since T < T_boil ammonia is subcooled liquid.

Or

• Go to the temperature table at T = 40
• Compare P = 16 to P^sat = 15.55. 
• Since P > P^sat ammonia is subcooled liquid.