Solution: A mixture of 100 g of K 2Cr2O7 and 200 g of water is stirred at 60°C until no more of the salt dissolves. The resulting solution is poured off, leaving the undissolved solid behind. The solution is no

A mixture of 100 g of K ₂Cr₂O₇ and 200 g of water is stirred at 60°C until no more of the salt dissolves. The resulting solution is poured off, leaving the undissolved solid behind. The solution is now cooled to 20°C. What mass of K₂Cr₂O₇ crystallizes from the solution during the cooling?

a) 24 g

b) 31 g

c) 43 g

d) 62 g