CaBr2
Because of the criss cross method of switching the charges
Answer:

Explanation:
1. First balance the equation for the synthesis of cryolite:

2. Find the limiting reagent between the
and 
- First calculate the number of moles of each compound using its molar mass and the mass that reacted completely:



- Divide the number of moles obtained between the stoichiometric coefficient of each compound in the chemical reaction:



The
is the limiting reagent because it has the smallest number.
3. Find the mass of cryolite produced:

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