Equal volumes of SO2(g) and O2(g) at STP contain the same number of molecules
According to Avogadro Law,
Equal volume of all the gases at same temperature and pressure have equal number of molecules.
This law state that volume and number of moles of gas have direct relation.
When the amount of gas increases its volume will increase and when the amount of gas decreases its volume will decrease.
V ∝ n
V/n = K
K is proportionality constant.
When number of moles change from n₁ to n₂ and volume from V₁ to V₂
expression will be,
V₁/n₁ = K , V₂/n₂ = K
V₁/n₁ = V₂/n₂
Number of molecules
taking a test rn with that question
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.