Chem Question: Help! (1 Viewer)

[jackky]

Can anyone help me on this question.. What is the MW of the polymer made from 5 glucose monomers? ery much appreciated

 

[undalay]

5x the MW of 1 glucose molecule.

I.e.

5x the MW of C₆H₁₂O<sub>6

Where carbon = 12.01
Hydrogen = 1.008
Oxygen = 16

(just off the top of my head)
</sub>

 

[Forbidden.]

5x the MW of 1 glucose molecule.

I.e.

5x the MW of C₆H₁₂O<sub>6

Where carbon = 12.01
Hydrogen = 1.008
Oxygen = 16

(just off the top of my head)
</sub>

But cellulose is a condensation polymer of glucose,
i.e.
n(C₆H₁₂O₆) --> n(C₆H₁₀O₅) + n-1(H₂O)
or
n(Glucose) --> n(Cellulose) + (n - 1)(Water)
where n is a number.

 

[undalay]

:]

 

[jackky]

5x the MW of 1 glucose molecule.

I.e.

5x the MW of C<SUB>6</SUB>H<SUB>12</SUB>O<SUB>6

Where carbon = 12.01
Hydrogen = 1.008
Oxygen = 16

(just off the top of my head)
</SUB>

wrong..!

 

[jackky]

the answer is MW= 828.. just dont know how to get that. well according to my chem teacher

 

[jackky]

But cellulose is a condensation polymer of glucose,
i.e.
n(C₆H₁₂O₆) --> n(C₆H₁₀O₅) + n-1(H₂O)
or
n(Glucose) --> n(Cellulose) + (n - 1)(Water)
where n is a number.

you r answer is 882 hmm

 

[independantz]

0_0.

(6x12.01)+(12x1.008)+(6x16)= 180

180x5=900

900-4x180= 828.7 g

 

[jackky]

900-4x180= 828.7 g

"

 

[independantz]

It's meant to be 4x18, because the polymer of glucose, cellulose/starch, is a condensation polymer, thus when they polymerise water is released.

 

[euro-dragon]

ok so you have 5 glucose monomers that bond through condensation (release of a water molecule) thus there are four bonds being created and four molecules of water being released so we calculate:

(5 x molecular weight of glucose C6H1206) - (4 x molecular weight of water H2O) thus we have:

(5 x 180.156) - (4 x 18.016) =

900.78 - 72.064 = 828.716

Hope that makes it sound easier

 

[Forbidden.]

I swear a question like this appeared in the 2006 paper and SuccessOne covers a method to solve questions like this, after my HSC my knowledge has been a little shaky.