Which gas has molecules with the greatest average molecular speed at 25°c?

Answer: the options to the questions are

a. 1.0 moles of N2

b. 0.5 moles of New

c. 0.2 moles of CO2

d. 2 moles of He

Answer D

Explanation:

The average molecular speed v of gas is given by = √ (8RT,/πM)

From the equation it can be seen that substance with lowest molar mass has the highest velocity has He is the answer