Question

Question #396f4

Answer 1

Helium will have the higher velocity given that both gases are at the same temperature.

Explanation:

If both gases are at the same temperature, their kinetic energy (KE) values will be equal to each other.

KE = `1/2 mv^2`

Since the mass of He is 4g/mol and `CO_2` is 44g/mol the He atoms must be moving much faster than the `CO_2` molecules since their mass is so much lower.

You can calculate how much faster He atoms will move by using Graham's law. Here is a video discussing how to use this law. The sample uses He and `N_2`, to solve for your question you would just substitute in the `CO_2` value instead of nitrogen then re-calculate.

Hope this helps!