A sealed container holds 0.020 moles of nitrogen (N2) gas, at a ...

[kshipps]

A sealed container holds 0.020 moles of nitrogen (N2) gas, at a pressure of 1.5 atmospheres and a temperature of 290 K.
 
  The atomic mass of nitrogen is 14.0 g/mol. The Boltzmann constant is 1.38  10-23 J/K and the ideal gas constant is R = 8.314 J/mol  K = 0.0821 L  atm/mol  K. The mass density of the gas is closest to
  A) 0.90 kg/m3.
  B) 1.3 kg/m3.
  C) 1.8 kg/m3.
  D) 2.2 kg/m3.
  E) 2.6 kg/m3.

Question 2

A sealed 26- tank is filled with 2000 moles of oxygen gas (O2) at an initial temperature of 270 K.
 
  The gas is heated to a final temperature of 460 K. The ATOMIC mass of oxygen is 16.0 g/mol, and the ideal gas constant is R = 8.314 J/mol  K = 0.0821 L  atm/mol  K. The final pressure of the gas is closest to
  A) 0.29 MPa.
  B) 0.31 MPa.
  C) 0.33 MPa.
  D) 0.34 MPa.
  E) 0.36 MPa.

[reversalruiz]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: A