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Answer 1

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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.