## Oxygen & Hemoglobin calculations

Debate and discussion of any biological questions not pertaining to a particular topic.

jonathan80
Garter
Posts: 1
Joined: Fri Nov 17, 2006 3:07 pm

### Oxygen & Hemoglobin calculations

It is well known that 1gram of Hb can carry 1.34 ml of O2.
I tried to calculate this number my self.

The molecular weight of hemoglobin is 68e3 Dalton or 1.122e-19 grams.
so each gram of Hb contains 1/1.122e-19 = 8.9126e18 molecules of Hb.
Each molecule of Hb contains four hem groups that can bind four O2 molecules so: 1grHb=8.9126e18*4=3.5650e19 molecules of O2.
The molecular weight of O2 is 16gr/mole. Therefore 1 molecule of O2 weights 16/6.0221415e23=2.6568e-23gram.
So - 1 gram of Hb contains 3.5650e19*2.6568e-23=9.4717e-4 grams of O2.
the density of O2 is 1.429gr/Liter ==> 0.69979Liter/gram ==> 699ml/gram
Finlay: 1 gr of Hb = 9.4717e-4*699=0.662mlO2.

Any idea where's my mistake?

biouser123
Garter
Posts: 15
Joined: Tue Oct 31, 2006 11:07 pm
The molecular weight of O2 is 32 and not 16....

MrMistery
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:
the periodic table.. ain't it a bastard?
By the way, why did you want to calculate it by yourself? don't you trust your physiology book?
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

sachin
King Cobra
Posts: 1517
Joined: Mon Jan 30, 2006 12:39 pm
Location: MUMBAI / INDIA
Contact:
MrMistery wrote:the periodic table.. ain't it a bastard?
By the way, why did you want to calculate it by yourself? don't you trust your physiology book?

Whats this

Is this forum not open for everybody.

"jonathan80" is new he may have made some mistake, its our respons. to correct it, isn't it?

and if any body trying to explore anything is it bad? We ve to encourage such poples; tommorow they may be great scientist; unrecognised by us.
As Alb. Enstein Was in his school days
Senior Education Officer, BNHS, India. www.bnhs.org

Bitter Truth!
Who says reason for world war III will be Petrol?
Reason lies in two words "Me and Mine".

MrMistery
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:
hm.. I was joking... Geesh...
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

Dr.Stein
King Cobra
Posts: 3501
Joined: Thu Jul 07, 2005 7:58 am
Location: 55284 Yogyakarta, Indonesia
Contact:
Andrei, are you in your PMS syndrome?

MrMistery
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:
i certainly hope not
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

Dr.Stein
King Cobra
Posts: 3501
Joined: Thu Jul 07, 2005 7:58 am
Location: 55284 Yogyakarta, Indonesia
Contact:
Actually it was me

sachin
King Cobra
Posts: 1517
Joined: Mon Jan 30, 2006 12:39 pm
Location: MUMBAI / INDIA
Contact:
What causes PMS?
The causes of PMS are not clear. It is linked to the changing hormones during the menstrual cycle. Some women may be affected more than others by changing hormone levels during the menstrual cycle. Stress and emotional problems do not seem to cause PMS, but they may make it worse.