Recall that the **molecular speed of a gas** is given by:

$\overline{){\mathbf{mol}}{\mathbf{.}}{\mathbf{}}{\mathbf{speed}}{\mathbf{=}}\sqrt{\frac{\mathbf{3}\mathbf{RT}}{\mathbf{M}}}}$

where **R** = gas constant, **T** = temperature, and **M** = molar mass of the gas.

The following graph shows the distribution of molecular velocities for two different molecules (A and B) at the same temperature.

Which molecule has the higher molar mass?

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