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

The best statement that would describe effusion of gases is that at a given temperature, gas particles with smaller masses move faster. According to the Graham's Law, the rate of effusion of a gas is inversely proportional to the square root of the molecular weight of that gas. Therefore, the smaller the mass the faster it effuses.

7 is dna

and i got 10 wrong but big to the guy with all 20 answers.