What volume of 1.75M CaSO3 solution could be prepared from 450g of CaSO3?
How many mols CaSO3 are in 450g.
That's mols = grams/molar mass
Then use M = mols/L. You know M and mols solve for L.
That's mols = grams/molar mass
Then use M = mols/L. You know M and mols solve for L.