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Calculate the molecular mass of sucrose(C12H22O11) molecule?

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in Chemistry – Class 11 by (148k points)
Calculate the molecular mass of sucrose(C12H22O11) molecule?

(a) 342 amu

(b) 343 amu

(c) 341 amu

(d) 340 amu

I had been asked this question in an internship interview.

This question is from Atomic and Molecular Masses in chapter Chemistry Basic Concepts of Chemistry – Class 11

1 Answer

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Right option is (a) 342 amu

To explain I would say: 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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