A sample of protein was analysed for metal content and analysis revealed that it contained magnesium and titanium. If these are the only metallic species present in the protein and it contains 0.004%

Question

A sample of protein was analysed for metal content and analysis revealed that it contained magnesium and titanium. If these are the only metallic species present in the protein and it contains 0.004% Mg by mass and 0.006% . Ti by mass, then the minimum possible molar mass (in gm / mol ) of the protein is : [ Mg = 24 , Ti = 48 ]

TestHub · Accepted Answer

Explain Question: Asked minimum possible molar mass.

Concept: Based on % composition.

Solution:

We have to find, minimum possible molar mass of protein :

Mass ratio of ' Mg ' and $^{'} Ti^{'} = \frac{2}{3}$

It means, 1 mole of protein contains,

4 mole of Mg and 3 mole of Ti

4 mole of $Mg = 24 \times 4 = 96 g$

3 mole of $Ti = 3 \times 48 = 144 g$

Total mass of metal $= (96 + 144) g = 240 g$

∴ % Mass of metal = $\frac{Mass of metal}{Molar mass of protein} \times 100$

$\Rightarrow 0.01 = \frac{20}{MM of protein} \times 100$

∴ Molar mass of protein $= 2400000 g / mol$

Molar mass of protein $= 24 \times 1 0^{5} g / mole$

Chemistry - Mole Concept Question with Solution | TestHub

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