MgSO4 x 7H2O:

Calculate how much mass of water is in the given formula. ​

Ineed to find the answer of this question because i dont understand it

Helium decays to form lithium. which equation correctly describes this decay?

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water