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Insulin contains 3.4% sulphur.Then the minimum molecular mass of the insulin is about

$\begin{array}{1 1}(a)\;940amu&(b)\;9400amu\\(c)\;3600amu&(d)\;970amu\end{array}$

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3.4g sulphur is present in 100g insulin.
$\therefore$ 32g sulphur will be present in $\large\frac{100}{34}$$\times 32g$
Insulin=940
$\therefore$ Molar mass of insulin is about 940amu.
Hence (a) is the correct answer.
answered Oct 22, 2013 by sreemathi.v
 

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