In the neutralization of sulfuric acid with sodium hydroxide, the theoretical yield from 6.9g of sulfuric acid is 10g. In a synthesis, the actual yield is 7.2g. What is the percentage yield for this synthesis?
And thus for this example
And we don't even need a calculator.........
Most of the time, we write a stoichiometric equation, that shows the molar equivalence between reactant and product, so that we can work out the limiting reagent etc.......
At any rate, you have not really quoted starting conditions here.