Question

The molecular formula of glucose is c6h12o6. What would be the molecular formula for a polymer made by linking five glucose molecules together by dehydration reactions? C30h60o30 c30h50o25 c30h52o26 c30h56o26 c30h55o25

Answer 1

C6H12O6 *5 =C30-H60-O30 -----1

if you made  polymer with 5 glucose molecules then 4 water molecules will be released

H2O *4 =C0- H8-O4     -------2

now subtract  2 from 1 = C30H52O26

Answer 2

The molecular formula of the polymer made by linking five glucose molecules will be C30H52O26

WHAT IS DEHYDRATION SYNTHESIS:

• Dehydration synthesis is a reaction in which two smaller molecules are joined together to form a larger molecule with the release of water (H20).

• The joining together of glucose molecules to form a much larger carbohydrate polymer is an example an example of dehydration synthesis.

• According to this question, if five molecules of glucose (C6H12O6) are joined together, the resulting molecular formula of the polymer should be:

5 × (C6H12O6)

= (C30H60O30)

• However, four molecules of water will be lost or released in the process. That is, 4 × H2O = H8O4 will be removed from (C30H60O30) to give rise to: C30H52O26

Therefore, the molecular formula of the polymer made by linking five glucose molecules will be C30H52O26.

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