Answer:
See explanations and answers below
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
