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The melting point depends on the number of water molecules (x) in CaCl2.xH2O

772 °C (anhydrous) (x = 0)

260 °C (monohydrate) (x = 1)

176 °C (dihydrate) (x = 2)

45.5 °C (tetrahydrate) (x = 4)

30 °C (hexahydrate) (x = 6)

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