- #1
Michael_Light
- 113
- 0
Homework Statement
1) Haemoglobin contains 33% by mass of iron. Each molecules of haemoglobin has two iron atoms. Calculate the relative molecular mass of haemoglobin.
2) The relative molecular mass of water is 18.0. Calculate the mass of water molecule.
Homework Equations
Relative atomic mass of iron = 55.8, hydrogen=1, oxygen =16
The Attempt at a Solution
1) 1 mol of haemoglobin contains 2 mol of iron atoms, hence mass of iron in haemoglobin = 55.8*2= 111.6g. Iron occupies the mass of haemoglobin by 33%, so the mass of a haemoglobin = (111.6*100)/33 = 338.18g. => Relative molecular mass of a haemoglobin = 338.18 g/mol.
BUT the answer give by the answer sheet is 33818 g/mol. Can anyone correct my solution?
2) I have no idea on this. Can anyone explain to me how to get the answer? The correct answer is 2.99*10^-23 g.
Thank you for your help.