I was seeking for magnesium sulphate heptahydrate at our institute's market because I need to acquire some. My colleague is looking for MgSO4 7H2O, MW 246.48g/mol, CAS 10034-99-8. However, I discovered a number of products with the same CAS number but slightly different molecular weights (MW 246.47g/mol and MW 246/46g/mol).

Why are there various molecular weights associated with the same CAS number?

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