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
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