3. What volume of 7.5M Na_(2)SO_(4) can be made from 0.09 moles of Na_(2)SO_(4) solution.

To find the volume of a 7.5M Na2SO4 solution that can be made from 0.09 moles of Na2SO4, we can use the formula:Volume (L) = Moles / MolarityGiven:Moles of Na2SO4 = 0.09 molesMolarity of Na2SO4 solution = 7.5MSubstituting the values in the formula:Volume (L) = 0.09 moles / 7.5MVolume (L) = 0.012 LTherefore, the volume of the 7.5M Na2SO4 solution that can be made from 0.09 moles of Na2SO4 is 0.012 liters or 12 milliliters.