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Answer:

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Explanation:

From the equation  each mole calcium bromide makes 2 moles sodium bromide    

1) 5 x 2 = 10 moles  sodium bromide

2) 2 moles of calcium bromide will make 2 moles of calcium sulfate ( from the equation)

       mole weight of calcium sulfate =

              Ca = 40  S = 32  O4 = 64    total mole weight = 136 gm

                   two moles would weigh  272 gms

3)   845 gm of calcium sulfate is  845 gm / 136 gm/mole = 6.21 moles

      6.21 moles of  Ca Br2   will be needed

             6 .21 ( 40 + 2 *79.9) = 1240.76 gm

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