4. The relative molecular mass of Na2S2O3.5H2O
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In its anhydrous form, sodium thiosulfate has a molar mass of 158.11 grams per mole. The more commonly available pentahydrate from, Na2S2O3. 5H2O has a molar mass of 248.18 g/mol. It has a white, crystalline appearance as a solid and is odourless.
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