NaBr reacting with H2SO4

Does anyone know why the general equation for NaBr and H2SO4 is
2NaBr + 2H2SO4-> Na2SO4 +Br2 + SO2 +2H2O
The closest I could get was
NaBr +H2SO4 -> 2NaHSO4 + 2HBr
2HBr + H2SO4 -> Br2 + SO2 + 2H2O
combined them to get
NaBr + 3H2SO4 -> 2NaHSO4 + Br2 + SO2 + 2H2O

I am not sure how they got 2H2SO4 and Na2SO4 , especially where the H has gone in Na2SO4
I looked at some solutions online but they only give the ionic equations, I get how they got the ionic equations but I don’t know how to write the full equations
Thanks for any help

Sulfuric acid is an oxidising agent, not a very strong one, but an oxidising agent nevertheless. With the larger halide ions, bromide and iodide, which are better reducing agents, there is a redox reaction:

2Br^- ==> Br₂ + 2e
SO₄^2- + 4H⁺ + 2e ==> SO₂ + 2H₂O
---------------------------------------------------------------------------------------------------------- add together
2Br^- + SO₄^2- + 4H⁺ ==> Br₂ + SO₂ + 2H₂O

If you need the balanced equation (not the ionic equation) you have to put in the balancing (spectator ions)

For example, the bromide arrives in the form of sodium bromide, so you must also add two sodium ions, the sulfate ions come from the sulfuric acid and the hydrogen ions from more sulfuric acid, etc.

2NaBr + 2H₂SO₄ ==> Br₂ + SO₂ + 2H₂O + Na₂SO₄

Thank you so much for answering, so all I needed to do was write the half equation and add Na back to the equation to get the balanced equation? Also, how do I know when to answer with half equation and when to use the full equation? The question only says write an equation
(NaBr + H2SO4 -> NaHSO4 + HBr
2HBr + H2SO4 -> Br2 + SO2 + 2H2O)?
Thanks

Be careful with the term "half-equation", it means either the reduction or the oxidation part (half) of a redox reaction.

NaBr + H₂SO₄ ==> NaHSO₄ + HBr
is NOT a half-equation

Br^- + H₂SO₄ ==> HSO₄^- + HBr
is NOT a half-equation - it is an ionic equation

An equation shows the reactants and products of a chemical reaction and their stoichiometries

An ionic equation shows only the species that actually take part in the reaction, omitting the spectator ions

A half-equation shows only the reduction or oxidation of a redox reaction.

You add the two half-equations (one oxidation and one reduction) together to get the ionic redox equation.

Hi, so what should I write if the question only says write the equation or the general equation? Do I combine the ionic equations (Do I write the ionic redox equation)?
Thank you

You write a balanced equation for the reaction showning reactants and products.
If you were to write the ionic equation I doubt if you would lose a mark, unless it specifically asked for a full chemical equation showing spectator ions.