Remember this formula: C1V1=C2V2 C1 being the initial concentration V1 being the initial volume C2 being the final concentration V2 being the final concentration
In this case we just plug and chug: C1=10 M V1=what we're looking for C2=1.50 M V2=500 mL
10*V1=1.5*500 V1=750/10= 75 mL of 10 M sulfuric acid needed.
First get 400 mL DI water. Add 75 mL 10 M sulfuric acid. Then add enough DI water to get the final volume to 500 mL.