An unknown amino acid has 0.032 % sulphur by wt. If each molecule has one S atom only, 1 g. of amino acid has molecules :

Question

An unknown amino acid has 0.032 % sulphur by wt. If each molecule has one S atom only, 1 g. of amino acid has molecules : (A) 6.02 × 1018 (B) 6.02 × 1019 (C) 6.02 × 1024 (D) 6.02 × 1023

Tardigrade Admin · Accepted Answer

Mass of S =1 × (0.032/100) =3.2 × 10-4 g mol of S =(3.2 × 10-4/32) =10-5 mol ( mol of amino acid) molecules of amino acid =10-5 × N A =6.023 × 1018 molecules

Q. An unknown amino acid has $0.032%$ sulphur by wt. If each molecule has one $S$ atom only, $1 g$ . of amino acid has ______ molecules :

$6.02 \times 1 0^{18}$

$6.02 \times 1 0^{19}$

$6.02 \times 1 0^{24}$

$6.02 \times 1 0^{23}$

Mass of $S = 1 \times \frac{0.032}{100}$
$= 3.2 \times 1 0^{- 4} g$
mol of $S = \frac{3.2 \times 1 0 ^{- 4}}{32}$
$= 1 0^{- 5} m o l (m o l$ of amino acid)
molecules of amino acid $= 1 0^{- 5} \times N_{A}$
$= 6.023 \times 1 0^{18}$ molecules

Q. An unknown amino acid has 0.032% sulphur by wt. If each molecule has one S atom only, 1g. of amino acid has ______ molecules :

6.02×1018

6.02×1019

6.02×1024

6.02×1023