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Q.

Calculate the molecular mass of sucrose(C12H22O11) molecule?

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a

342 amu

b

343 amu

c

341 amu 
 

d

340 amu 

answer is A.

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Detailed Solution

The individual mass of carbon is 12 amu, the individual mass of hydrogen is 1 amu & the individual mass of oxygen is 16 amu.  

But sucrose has 12 carbons, 22 hydrogens and 11 oxygens, that is  

=12 x 12 + 22 x 1 + 11 x 16 = 342 amu. 

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