What would be the molecular formula for a polymer made by linking ten glucose molecules together by

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13 years ago

What would be the molecular formula for a polymer made by linking ten glucose molecules together by

The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions? And how do you come up with the answer?

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boeing

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13 years ago

In the dehydration reaction 1 H2O will be lost each time. You are linking 10 glucose molecules together by dehydration reaction therfore you will lose 20 Hydrogen and 10 Oxygen.

C6H12O6 x 10 = C60H120O60 (Carbon 60 Hydrogen 120 Oxygen 60)

lets subtract now what we lost in the dehydration reactions

C60H120O60 - H20 - O10 = C60H100O50 (Carbon 50 Hydrogen 100 Oxygen 50)

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boeing

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13 years ago Edited: 13 years ago, Rit727

I did not do much explaining in the above answer.

When a bond forms between two monomers, each monomer contributes part of the water molecule that is lost: One molecule provides a hydroxyl group (-OH), while the other provides a hydrogen (-H).This reaction can be repeated as monomers are added to the chain one by one, making a polymer. The dehydration process
is facilitated by enzymes, specialized macromolecules that speed up chemical reactions in cells.

source cited: Biology 8th edition, Campbell

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duddy

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13 years ago

I think the answer is C60H102O51

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boeing

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13 years ago

I sure wish I could edit my posts. I did not catch the typo which should be ( Carbon 60 Hydrogen 100 oxygen 50).

Duddy - How did you arrive at that answer? I stand corrected if I am indeed wrong.

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duddy

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Staff Member

13 years ago

Hey Rit727, okay...

Rightwards Arrow

C6H12O6 is one molecule.

Add 10 more molecules, so X10

Rightwards Arrow

C60H120O60 is one molecule.

A dehydration reaction: -H2O * 10

Rightwards Arrow

-H20O10

Remember that if we had 10 glucose molecules, the glucoses on the outside do not lose a hydrogen because they are not involved in the reaction, so add 2 more hydrogens and 1 oxygen.

Rightwards Arrow

-H18O9

Add these to the total:

C60H120O60 - H18O9 = C60H102O51

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boeing

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13 years ago

Thank you Duddy. I agree with your solution and with your explanation I see what I have done wrong.

Cheers Duddy!

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duddy

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13 years ago

Quote from: Rit727 (13 years ago)

Thank you Duddy. I agree with your solution and with your explanation I see what I have done wrong.

Cheers Duddy!

No problem Bro.

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