It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration). A 43.19 gram sample of a hydrate of MgBr2 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 27.21 grams of the anhydrous compound remained. What is the formula of the hydrate?
Answers: 2
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denote the number of 
formula units for every 
formula unit. The formula of the hydrate would be 
.
: 
.
: 
.
: 
.
: 
.
.
.
. There was 
of this compound. Calculate the number of moles of formula units in that much of this compound:
.
of water 
of 
:
.
of 
of 
.
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