# 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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###### Problem Details

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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mass Percent Formula concept. You can view video lessons to learn Mass Percent Formula. Or if you need more Mass Percent Formula practice, you can also practice Mass Percent Formula practice problems.

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Based on our data, we think this problem is relevant for Professor Ratliff's class at USF.