1. A student obtains an empirical formula of C₁H_2.67. 

a) Why is this not a valid empirical formula? 

b) Use the student's empirical formula to determine the correct empirical formula. 

2. Magnesium sulfate, MgSO₄, is available as anhydrous crystals or as a heptahydrate. Assume that you are given a bottle of MgSO₄, but you are not sure whether or not it is the hydrate. 

a) What method would you use in a laboratory to determine whether this is the hydrate? 

b) If it is the hydrate, what results would you expect to see? 

c) If it is the anhydrous crystals, what results would you expect to see?

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