Question

Myoglobin stores oxygen for metabolic process in muscle. Chemical analysis shows that it contains 0.32% Fe by mass. If there was one Fe atom per molecule of myoglobin , what is the molar mass of myoglobin?

Answer 1

We know that the molar mass of Fe is 56

So, 56g is 0.34% of 1 mole of myoglobin 

=> 56g/0.34 is 1% of 1 mole of myoglobin 

=> 56*100g/0.34 is 100% of 1 mole of myoglobin 

=> 1.6 x10^4 g/mol is molar mass of myoglobin

Answer 2

Answer:

1.75 * 10^4 g/mol is the answer!

Explanation:

(Mass of 1 Fe atom/Molar mass of Myoglobin) * 100 = 0.32

i.e,

$\frac{56}{x} \times 100 = 0.32 \\ x = \frac{56 \times 100 \times 100}{32} \\ x = 1.75 \times {10}^{4}$