Answer: The number of gram of ammonia gas (
) contained in the a 3.0L vessel at 305 K with a pressure of 1.50 atm is 3.048 g.
Step-by-step explanation:
Given: Volume = 3.0 L
Temperature = 305 K
Pressure = 1.50 atm
Formula used to calculate the number of moles is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.

It is known that moles is the mass of substance divided by its molar mass.
Hence, mass of ammonia gas (molar mass = 17.03 g/mol) is as follows.

Thus, we can conclude that the number of gram of ammonia gas (
) contained in the a 3.0L vessel at 305 K with a pressure of 1.50 atm is 3.048 g.