Question

Percentage of Se (atomic mass = 78.4) in peroxidase anhydrase enzyme is 0.5% by mass, then minimum molecular mass of peroxidase anhydrase enzyme is:

• A. $1.576 \times 10^{4}$
• B. $1.576 \times 10^{3}$
• C. $15.76$
• D. $2.136 \times 10^{4}$

Answer 1

Answer: (A)

The enzyme must contain at least one atom of Se
$\because 0.5\,g$ enzyme, molar mass = 100
$\therefore 78.4\,g$ enzyme, molar mass $=\frac{100\times 78.4}{0.5}$
$=1.576 \times 10^{4}$