Question

Enter your answer in the provided box. Hemoglobin is the protein that transports 02 through the blood from the lungs to the rest of the body. In doing so, each molecule of hemoglobin combines with four molecules of O. If 1.58 g of hemoglobin combines with 2.48 mL of O2 at 37°C and 724 torr, what is the molar mass of hemoglobin? 10 g/mol (Enter your answer in scientific notation.)

Answer 1

Vo2​​=2.48 mL
=2.48×10−3 L
Po2​​=724 torr = 0.9526 atm
T=37oC=310 K
PV=nRT
nO2=PV​/RT

( 0.9526 (atm) x 2.48 x 10-3 L)

nO2 = -----------------------------------------------------

0.082 (L atm)/(mol K) x 310 K

(0.002362448)

nO2 = ------------------

25.42

nO2 = 9.28 x 10-5  mol

∴ Haemoglobin = 9.28 x 10-5  mol
Molar mass =mass/ molar [∵ 1Hb combines with 4O2​]
= mass x 4 / molar

= (1.58 g x 4) / (9.28 x 10-5  mol)

= 6.32 g / 9.28 x 10-5  mol

= 68003.35 g/mol

Molar mass of Haemoglobin  = 6.800335 x 104 g/mol