Question

One molecule of the antibiotic known as penicillin G has a mass of 5.553×10−22g. What is the molar mass of penicillin G?

Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecule and contains 0.340% iron by mass. Calculate the molar mass of hemoglobin.

Answer 1

1. Mass of 1 molecule penicillin G = 5.553*10^-22 grams

Mass of 6.022*10^23 molecules

= 5.553*10^-22 * 6.022*10^23

= 334.4 grams / mol

2. Mass of 1 iron atom = 55.845 amu

Mass of 4 iron atom = 55.845 * 4 = 223.38 amu

In grams = 223.38* 1.66*10^-24 = 3.71*10^-22 grams

This is 0.34%

For 100 % = (3.71*10^-22 *100 )/0.34

= 1.1*10^-19 grams / molecule

For 1 mole

6.022*10^23 molecules mass = 1.1*10^-19 * 6.022*10^23

= 65677.1364 grams

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