Question

• What will be the Weight average
molecular weight of a protein solution
having haemoglobin, ribonuclease
and myoglobin 15.5 kg/mol, 13.7
kg/mol and 17.4 kg/mol respectively?
nd
Answer
A. 15.47 kg/mol
B. 15.60 kg/mol
c. 15.90 g/mol
D.16.23 g/mol​

Answer 1

Answer:

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Explanation:

Mass of hemoglobin =M1=15.5kg/mol

mass of ribonuclease=M2=13.7kg/mol

mass of myoglobin=M3=17.4kg/mol

It is given that we have an equal number of all these proteins

n1=n2=n3=n

average mass molecular weight formula

Mw=sigmani×Mi^2/sigmani×M1

Mw=n1M1^2+n2M2^2+n3M3^2/n1M1+n2M2+n3M3

Mw=n(15.5)^2+n(13.7)^2+n(17.4)^2/n×15.5+n×13.7+n×17.4

Mw=n(240.25)+n(187.69)+n(302.76)/n×15.5+n×13.7+n×17.4

Mw=n(240.25+187.69+302.76)/n(15.5+13.7+17.4)

Mw=(730.7)n/(46.6)n

Mw=15.68kg/mol