6. Which of these gas diffuses fastest under same temperature and pressure? а) CH4
b) C2H2
c)NO
d)o2

The lighter a gas is, the faster it will tend to diffuse.

Using either the Molar mass below or the diffusion rates, you will see that CH4 is the lightest and with greatest diffusion rate hence the fastest.

THE ANSWER IS CH4

Explanation:

Use Grahams Law to determine diffusion rates

Diffusion rate =

Molar mass:

CH4 = 16.04 g/mol

C2H2 = 26.04 g/mol

NO = 30.01 g/mol

O2 = 32 g/mol

Diffusion Rates using formula above:

CH4 = 0.24968

C2H2 = 0.19596

NO = 0.18254

O2 = 0.17677

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

the answer is 0.8m.

by: nicholas