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Please simplify as much as possible. Something isnt clicking for me. 1.How many moles of ammonia...

Please simplify as much as possible. Something isnt clicking for me.

1.How many moles of ammonia (NH3) are in 68.5 g of the compound?

2.How many grams of Br are in 155 g of CaBr2?

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Answer #1

1.How many moles of ammonia (NH3) are in 68.5 g of the compound?

moles = W/Mw= 68.5/17 = 4.029mole

2.How many grams of Br are in 155 g of CaBr2?

CaBr2 wight = 199.88gm

CaBr2 moles = 155/ 199.88= 0.775moles

Ca moles = 0.775 ,   Br moles = 2 x 0.775= 1.55

bromine wt = moles x molar mass

                   = 1.55 x(159/2)

                  Br weight = 123.2g

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