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QUESTION

# Im having trouble with this question. A sample of NaBr contains 22.34% Na by mass. considering the law of constant composition how many grams of sodium does 8.01 grams sample of sodium bromide contain?

1.79 g

I'm assuming you mean how many grams of sodium does 8.01 grams of sodium bromide have, because Bromine would not have any sodium in it.

If NaBr is 22.34% sodium, then the amount of Sodium in a sample would be (22.34/100) x ("amount of NaBr").

Therefore the amount of sodium in 8.01 grams of NaBr is (22.34/100)x (8.01 "grams") = 0.2234 x 8.01 = 1.79 g of Sodium.