A cubic box with sides of 20.0 cm contains 2.00 1023 molecules ...

[savannahhooper]

A cubic box with sides of 20.0 cm contains 2.00  1023 molecules of helium with a root-mean-square speed (thermal speed) of 200 m/s. The mass of a helium molecule is 3.40  10-27 kg.
 
  What is the average pressure exerted by the molecules on the walls of the container? The Boltzmann constant is 1.38  10-23 J/K and the ideal gas constant is R = 8.314 J/molK = 0.0821 L  atm/mol  K.
  A) 3.39 kPa B) 1.13 kPa C) 570 Pa D) 9.10 Pa E) 2.26 kPa

Question 2

An electron is bound in an infinite square-well potential (a box) on the x-axis. The width of the well is L and the well extends from x = 0.00 nm to
 
  In its present state, the normalized wave function of the electron is given by: (x) = sin (2x/L). What is the energy of the electron in this state?(h = 6.626  10-34 J  s, mel = 9.11  10-31 kg, 1 eV = 1.60  10-19)
  A) 0.10 eV
  B) 0.052 eV
  C) 0.13 eV
  D) 0.078 eV
  E) 0.026 eV

[jojobee318]

Answer to Question 1

B

Answer to Question 2

A

[savannahhooper]

Thank you!

[jojobee318]

Always glad to help...