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A certain magnesium sulfate salt hydrate sample has a mass of 246.506 mg. After heating and cooling the sample has a new mass of 120.366

A certain magnesium sulfate salt hydrate sample has a mass of 246.506 mg. After heating and cooling the sample has a new mass of 120.366 mg. How many moles of water were included in 1 mole of the original salt's ionic lattice structure?

a. 7

b. 5

c. 4

d. 6

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