Molar mass :
[tex]H_2SO_4= 1*2+32+16*4= 98g/mol[/tex]
Number of moles:
[tex]n = \frac{solute}{molar( mass)} [/tex]
[tex]n = \frac{73.5g}{98g/mol} [/tex]
[tex]n=0.75 (moles)[/tex]
Volume = 3.0 L
[tex]M = \frac{n}{V} [/tex]
[tex]M = \frac{0.75(moles)}{3.0L} [/tex]
[tex]M = 0.25 mol/L ^{-1} [/tex]
hope this helps!