0.252 M First figure out how much calcium sulfate you have. You do this by multiplying the volume of solution you have by its concentration. 0.734 L * 1.13 moles/L = 0.82942 moles Now figure out the volume of fluid you will have after diluting. Just simply add the volumes together. 0.734 L + 2.56 L = 3.294 L Finally, divide the number of moles you have by the new volume 0.82942 moles / 3.294 L = 0.251797 moles/L Round to 3 significant figures giving 0.252 M