A 1.446 g sample of calcium sulfate dihydrate is heated, leaving 1.143 g of solid residue. What is the whole number ratio of moles of water to moles of anhydrous salt?

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

that's what i got you can count the number of atoms