which statement best explains why different gases effuse at different rates? at a given pressure, gas…

which statement best explains why different gases effuse at different rates? at a given pressure, gas particles with smaller masses move faster. at a given pressure, gas particles with smaller masses move slower. at a given temperature, gas particles with smaller masses move faster. at a given temperature, gas particles with smaller masses move slower.

which statement best explains why different gases effuse at different rates? at a given pressure, gas particles with smaller masses move faster. at a given pressure, gas particles with smaller masses move slower. at a given temperature, gas particles with smaller masses move faster. at a given temperature, gas particles with smaller masses move slower.

Answer

Brief Explanations:

According to Graham's law of effusion and the kinetic - molecular theory of gases, at a given temperature, the average kinetic energy of gas particles is the same. Since kinetic energy $KE=\frac{1}{2}mv^{2}$, for a fixed $KE$, particles with smaller mass $m$ have a higher velocity $v$.

Answer:

At a given temperature, gas particles with smaller masses move faster.