Answered

A 0.03 mol sample of NH4NO3 (s) is placed in a 1 L evacuated flask, which is then sealed and heated. The NH4NO3 (s) decomposes completely according to the balanced equation above. The total pressure in the flask measured at 400 K is closest to which of the following? (The value of the gas constant, R, is 0.082 L atm mol-1 K-1.)
a. 3 atm
b. 1 atm
c. 0.5 atm
d. 0.1 atm
e. 0.03 atm

Answer :

EDUARD22SLYGO

The total pressure in the flask measured at 400 K is 1 atm

The correct answer to the question is Option B. 1 atm

From the question given above, the following data were obtained:

  • Number of mole (n) = 0.03 mole
  • Volume (V) = 1 L
  • Temperature (T) = 400 K
  • Gas constant (R) = 0.082 atm.L/Kmol
  • Pressure (P) =?

Using the ideal gas equation, we can obtain the pressure in the flask as follow:

PV = nRT

P × 1 = 0.03 × 0.082 × 400

P = 1 atm

Therefore, the total pressure in the flask measured at 400 K is 1 atm

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