A list of compiled anhydrous masses for na2co3 caso4 and, Ask an Expert

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A list of compiled anhydrous masses for Na2CO3, CaSO4, and MgSO4 and I have to find the molar ratio of these anhydrous masses. ( the compiled list is from every section of chemistry, so I have different masses for different dates for each of the anhydrates) Please help and try to explain as best as possible. Id really appreciate it! (ps--> I have my set of information for NA2co3 from doing it in lab so I have like the weight of the crucible and the mass of MY anhydrite's molar mass, would this be of use?)

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