The interaction of sodium sulfite with sulfuric acid is equimolar, how many moles of salt react, so many moles of sulfur dioxide will be released:
Na2SO3 + H2SO4 = SO2 + H2O + Na2SO4.
Let’s calculate the amount of substance using the value of molar masses M and the data of the problem.
M H2SO4 is 98 g, which means that it entered into a reaction: ((200 * 49%) / 100%) / 98 = 1 mol.
The volume of the evolved SO2 gas is equal to:
22.4 l / mol * 1 mol = 22.4 l.
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