Stoichometry problem

Barium chloride was used to precipitate silver chloride from a solution of silver nitrate. What mass of barium chloride had to react if 0.635 g of silver chloride formed?

This problem is driving me crazy! Can someone help!

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1. Get the balanced equation

1. Get the balanced equation for this reaction.
2. convert grams of silver chloride into moles.
3. use the ratios from the reaction to determine the no. of moles of ba.
4. mass= moles * Mr

And you're done :)