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A 55 kg woman has 7.5 x 10^-3 mol of hemoglobin, molar mass 64,456 g/mol, in her blood. What mass of hemoglobin is that?
A483 g
B48.3 g
C4830 g
D64.5 g
Answer & Solution
Correct answer: A. 483 g
1. Mass equals moles multiplied by molar mass.
2. Substituting gives 7.5 x 10^-3 mol x 64,456 g/mol.
3. The product is 483 g of hemoglobin.
4. Sanity check: about a hundredth of a mole of a 64 kg per mole protein should weigh several hundred grams.
5. The value 64.5 g multiplies the molar mass by a bare 10^-3 and forgets the factor of 7.5.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_
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