Answer: The coefficient of sulfuric acid in the given equation is 3.
Step-by-step explanation:
The chemical equation for the reaction of strontium phosphate and sulfuric acid follows:

By Stoichiometry of the reaction:
1 mole of strontium phosphate reacts with 3 moles of sulfuric acid to produce 3 moles of strontium sulfate and 2 moles of phosphoric acid.
The given reaction is a type of double displacement reaction because here exchange of ions takes place.
Hence, the coefficient of sulfuric acid in the given equation is 3.