Sulfuric acid is a strong acid with the formula H_2 S O_4. Sodium carbonate is a salt of weak carbonic acid H_2 C O_3 and its formula is Na_2 C O_3.
Usually when a strong acid reacts with a salt of a weak acid, the salt of the strong acid and the weak acid occur. In this problem the reaction satisfies this rule, and sodium sulphate Na_2 S O_4 and carbonic acid are formed. Also carbonic acid is unstable and forms water H_2 O and carbon dioxide C O_2 which goes out as a gas.
So the (potentially unbalanced) reaction is
H_2 S O_4 +Na_2 C O_3 = Na_2 S O_4 +H_2 O +C O_2.
When we examine this equation with respect to all chemical elements involved, it appears to be balanced.
https://courses.lumenlearning.com/boundless-chemistry/chapter/acid-base-reactions/
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