J.R. S. answered 05/06/21
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2HCl + Na2SO4 ==> 2NaCl + H2SO4 ... BALANCED equation
Note the mole ratio between HCl and H2SO4. It takes 2 moles HCl to produce 1 mol H2SO4
Use this information to solve the problem:
3.7 mols H2SO4 x 2 mols HCl / 1 mol H2SO4 = 7.4 mols HCl needed