Physical Chemistry Which of the following statements is correct? A) Because the

ID: 926661 • Letter: P

Question

Physical Chemistry

Which of the following statements is correct?

A) Because the de Broglie wavelength of a H2 molecule at 300. K is on the order of atomic dimensions, all properties of H2 are quantized.

B) For a H2 molecule moving in a one liter cubic container, the wavelength is much larger than the characteristic dimension of the container.

C) A system must be treated using quantum mechanics if the characteristic size for the property of interest is comparable to the wavelength.

D) The de Broglie wavelength of a H2 molecule is greater at 300. K than at 600. K.

A and D B and D A and C B and C

A) Because the de Broglie wavelength of a H2 molecule at 300. K is on the order of atomic dimensions, all properties of H2 are quantized.

C) A system must be treated using quantum mechanics if the characteristic size for the property of interest is comparable to the wavelength.

D) The de Broglie wavelength of a H2 molecule is greater at 300. K than at 600. K.

=> Since, de Broglie wavelength = h / mv. At higher temperature velocity will be high and thus, wavelength will be less.