Question

Which sample of oxygen gas contains molecules with the smallest average speed?

Object A

Object B

Object C

Object D

Sample Temperature (K)
A 250
B 273
C 273
D 298

Answer 1

Object A?

Answer 2

Yes, you are correct;

Remember Temperature is average kinetic energy. If you may know from your Physics classes...
\(KE=\frac{mv^2}{2}\)
hence
\(KE∝v\)
And \(T∝KE\)
So by the mathematical law of transitivity, \(T∝v\). Greater the Temp, greater the velocity, and vica versa. And here I'm assuming the mass is constant.