Molecular weight ?

[maxmac97]

could really use some help with with molecular weight. could some one please show me how to do this sample problem so i can understand it better. thanks

 

Fructose has the epirical formula c6h12o6. glucose has the same empirical formulia but a different structural formula. table sugar is composed of one fructose and one glucose joined together. calculate the molecular weight of sucrose sow calculation.

[MulderMan]

Fructose and gluclose join togeather in a condensation reaction, releasing a water molecule, and a surcose molecule.

 

C6H12O6 + C6H12O6 --> C12H22O11 +H2O

 

Then you can work out the molecular weight by multiplying each atoms Ar with the number of atoms are there, and add the values up for a total Mr.

 

I.e Ar: C=12 H=1 O=16

 

(12x12) + (1x22) + (11x16) = etc