1.78 g of an optically active L-amino acid ( | vedclass

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(B) Mass of $L$-amino acid $= 1.78 \ g$. The reaction of an amino acid with $NaNO_{2} / HCl$ (Van Slyke method) releases $1 \ mol$ of $N_{2}$ gas per

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$35,600 \ g \ mol^{-1}$

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(B) Mass of $L$-amino acid $= 1.78 \ g$. The reaction of an amino acid with $NaNO_{2} / HCl$ (Van Slyke method) releases $1 \ mol$ of $N_{2}$ gas per $1 \ mol$ of amino acid. At $STP$,$1 \ mol$ of gas occupies $22400 \ cm^{3}$. Moles of $N_{2}$ evolved $= \frac{448 \ cm^{3}}{22400 \ cm^{3} \ mol^{-1}} = 0.02 \ mol$. Since $1 \ mol$ of amino acid produces $1 \ mol$ of $N_{2}$,moles of amino acid $= 0.02 \ mol$. Molar mass of amino acid $= \frac{	ext{Mass}}{	ext{Moles}} = \frac{1.78 \ g}{0.02 \ mol} = 89 \ g \ mol^{-1}$. The protein contains $0.25 \%$ of this amino acid by mass. Let the molar mass of the protein be $M$. $0.25 \% 	ext{ of } M = 89 \ g \ mol^{-1}$. $\frac{0.25}{100} 	imes M = 89$. $M = \frac{89 	imes 100}{0.25} = 35600 \ g \ mol^{-1}$.

List-$I$ (Natural amino acid)	List-$II$ (Code)
$A$. Glutamic acid	$I$. $Q$
$B$. Glutamine	$II$. $W$
$C$. Tyrosine	$III$. $E$
$D$. Tryptophan	$IV$. $Y$

List-$I$ Natural Amino acid	List-$II$ One Letter Code
$A$. Arginine	$I$. $D$
$B$. Aspartic acid	$II$. $N$
$C$. Asparagine	$III$. $A$
$D$. Alanine	$IV$. $R$

$1.78 \ g$ of an optically active $L$-amino acid $(A)$ is treated with $NaNO_{2} / HCl$ at $0^{\circ}C$. $448 \ cm^{3}$ of nitrogen at $STP$ is evolved. $A$ sample of protein has $0.25 \%$ of this amino acid by mass. The molar mass of the protein is

Similar Questions

The total number of isomeric linear dipeptides which can be synthesised from racemic alanine is

Match List-$I$ with List-$II$.

List-$I$ (Natural amino acid) List-$II$ (Code)

$A$. Glutamic acid $I$. $Q$

$B$. Glutamine $II$. $W$

$C$. Tyrosine $III$. $E$

$D$. Tryptophan $IV$. $Y$

Match List-$I$ with List-$II$

List-$I$ Natural Amino acid List-$II$ One Letter Code

$A$. Arginine $I$. $D$

$B$. Aspartic acid $II$. $N$

$C$. Asparagine $III$. $A$

$D$. Alanine $IV$. $R$

Choose the correct answer from the options given below :-

Which $\alpha$-amino acid can cross-link peptide chains?

The main structural linkage of protein is

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