A solution of MgS04 containing 43 g of solid per 100 g of water is fed to a vacuum crystallizer at 220°F. The vacuum in the crystallizer corresponds to an H 2 0 boiling temperature of 43°F, and a saturated solution of MgS04 has a boiling-point elevation of 2°F. How much solution must be fed to the crystallizer to produce 900 kg of epsom salt (MgS04 ' 7H,O) per hour?