What mass of Na2SO4is produced when sulfuric acid reacts with 0.500 molesof sodium chloride?NaCl + H2SO4HCl + Na2SO4

Answer 1

You didn't provide any state conditions, such as is the NaCl solid or aqueous. If aqueous, then there is no reaction since you will have only ions in solution without a gas or precipitate being formed. If it is a solid, you still won't form Na₂SO₄ as the reaction, at room temperature would be NaCl(s) + H₂SO₄(aq) --> NaHSO₄(s) + HCl(g). Having said all of this, if we assume that the question is posed to see if you can balance and use stoichiometry, then we will write the following:

H₂SO₄ + 2NaCl ==> Na₂SO₄ + 2HCl

0.500 moles NaCl x 1 mole Na₂SO₄/2 moles NaCl x 142 g Na₂SO₄/mole = 35.5 g Na₂SO₄ formed (assuming H₂SO₄ is present in excess)