Problem: A sample is composed of a mixture of NaBr and CuSO4.5H2O. A chemist decided to analyze the mixture by dehydrating it by heating it to 120°C for 12 hours which removed all of the water present. If a 6.523 sample weighed 4.967 g after dehydration, what is the percentage of NaBr in the original hydrated sample?   a) 22.4 b) 33.9 c) 39.2 d) 79.7 e) none of the answers is within 5% of the correct answer.

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A sample is composed of a mixture of NaBr and CuSO4.5H2O. A chemist decided to analyze the mixture by dehydrating it by heating it to 120°C for 12 hours which removed all of the water present. If a 6.523 sample weighed 4.967 g after dehydration, what is the percentage of NaBr in the original hydrated sample?

a) 22.4

b) 33.9

c) 39.2

d) 79.7

e) none of the answers is within 5% of the correct answer.

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