A container contains helium gas at  $0°C$. What is the average linear momentum of a helium molecule of mass $\text{6}.\text{64}\times \text{1}{0}^{–\text{27}}$  kg in the container?

• A

  $\text{8}\times \text{1}{0}^{–\text{24}}{\text{kg m s}}^{–\text{1}}$

• B

  $8\times \text{1}{0}^{–\text{23}}{\text{kg m s}}^{–\text{1}}$

• C

  $18\times \text{1}{0}^{–\text{23}}{\text{kg m s}}^{–\text{1}}$

• D

  $18\times \text{1}{0}^{–\text{24}}{\text{kg m s}}^{–\text{1}}$