Petrol is an extremely complex mixture of organic compounds;
each compound has his molecular weight.
A molecular weight for a mixture is a nonsense.
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233 g/mole is average molecular weight of deseil
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The atomic weight of iron is 55.8 u.
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Hemoglobin A (the type most often found in adults) has a
molecular weight of 68 000 Da. Daltons (Da), atomic mass units
(amu), and molar weight are all equivalent, so hemoglobin A has a
molecular weight of 68 000g/mol.