Problem: A crystalline sample that has the formula MgCl 2.6H2O loses a portion of its water when it is dried in an oven for several hours but undergoes no other changes. If the student, Dora the Explorer, started with 10.000 g of the compound and ended up with a residue that weighed 7.342 g., what is the formula of the residue?   a) MgCl2.H2O b) MgCl2.2H2O c) MgCl2.3H2O d) MgCl2.4H2O e) MgCl2.5H2O

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A crystalline sample that has the formula MgCl 2.6H2O loses a portion of its water when it is dried in an oven for several hours but undergoes no other changes. If the student, Dora the Explorer, started with 10.000 g of the compound and ended up with a residue that weighed 7.342 g., what is the formula of the residue?

a) MgCl2.H2O

b) MgCl2.2H2O

c) MgCl2.3H2O

d) MgCl2.4H2O

e) MgCl2.5H2O

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