sodium nitrate + sulphuric acid -----> sodium sulphate + nitric acid write formula and then balance it
Reaction is
NaNO3 + H2SO4-----> Na2SO4 + HNO3
Balancing of the reaction:
There are 2 sodium atoms on the right side so multiply NaNO3 by 2 for getting equal number of sodium atoms.
Reaction becomes:
2 NaNO3 + H2SO4-----> Na2SO4 + HNO3
For getting equal numbers of NO3 groups on both the sides multiply HNO3 by 2.
Now the reaction will become
2 NaNO3 + H2SO4-----> Na2SO4 +2HNO3 which is the balanced equation.