Question

Fungal laccase, a blue protein found in wood-rotting fungi, is 0.390% cu by mass. if a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase?

Answer 1

Molar mass of copper is 63.546

so malar mass of the laccase is

4* 63.546
-------------- = 651.754
0.39

Answer 2

Answer:

65,179.487 g/mol is the molar mass of fungal laccase.

Explanation:

Percentage of copper in Fungal laccase = 0.390

Molar mass of fungal laccase = M

Number of copper atom in 1 fungal laccase molecule = 4

Atomic mass of copper = 63.55 g/mol

Percentage of an element in a compound:

$\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100$

Percentage of copper:

$\frac{4\times 63.55 g/mol}{M}\times 100=0.390\%$

$M=\frac{4\times 63.55 g/mol}{0.390}\times 100$

M = 65,179.487 g/mol

65,179.487 g/mol is the molar mass of fungal laccase.