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The relative molecular mass of Na₂S₂O₃.5H₂O is ______________.

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250 amu

250 g

248 amu

248 g

answer is C.

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Detailed Solution

Na₂S₂O₃•5H₂O is the chemical formula, and the molecular weight is 248.17.

Here, Sodium has an individual mass of 23 amu, hydrogen has a particular mass of 1 amu, sulphur has a mass of 32 amu and oxygen has a unique mass of 16 amu.

However, the molecule contains 2 sodium, 2 sulphur, 10 hydrogens, and 4 oxygen atoms, which gives a total of 248.17 g.

Hence, the molecular weight is 248.17 g.

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