Question

list as many sources of error as possible in the data for you experimental value for the moles hydrogen produced and for the determination of the standard molar volume of gas?

if a gas that is collected by the displacement method dissolves in water, as does oxygen or carbon dioxide, what effect will that property have on the final experimental value for the volume of gas produced

Answer 1

Sources of errors:
(i) If the gases are not at standard temperature and pressure there will be an error in the standard
molar volume of gas.
(ii) If the gas is impure,
(iii) if the gas is not captured properly then one may end up getting a wrong value for the moles of hydrogen
(iv) mass of magnesium, not weighed properly can also be one reason.

If gas gets dissolved then the moles of the hydrogen gas per volume of the gas will be reduced which in
turn changes molar volume of gas at standard temperature and pressure.