a) Avogadro Number =\[6.02 ×10^{21}\]
b) The relationship between average velocity \[\left(\overline{V}\right)\] and root mean square velocity (u) is \[\left(\overline{V}\right)\] =.9213u
c) The mean kinetic energy of an ideal gas is independent of the pressure of the gass
d) The root mean square velocity of the gas can be calculated by the formula \[\left(3RT/M\right)^{1/2}\]

Answer: a
Explanation: Avogadro number is 6.023 * 10²³