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The SODIUM salt of methyl orange has 7% sodium. What is the minimum molecular weight of the COMPOUND?

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Let M be the minimum molecular weight of the compound.

7% of the compound is sodium. It is EQUAL to

\frac{7}{100} \times m = 0.07m

g sodium in 1 mole of compound.

At least, 1 mole of Na will be PRESENT in 1 mole of compound.

1 mole of sodium WEIGHS 23 g.

Thus, 0.07M=23

M=

0.07

23

=329 g/mol

Thus, the minimum molecular weight of the compound is 329 g/mol.



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