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  4. A 5% solution of glucose (molar mass 180) is isotonic with a 2.5% solution of substance X at the same temperature. The molar mass of X is

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Q. A 5% solution of glucose (molar mass 180) is isotonic with a 2.5% solution of substance X at the same temperature. The molar mass of X is

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Solution:

$\frac{5}{180} = \frac{2.5}{x} or x = \frac{2.5 \times 180}{5} = 90$