Question

$ 0.1 $ mole of a carbohydrate with empirical formula $ C{{H}_{2}}O $ contains $ 1\, g $ of hydrogen. What is its molecular formula?

• A. $ {{C}_{5}}{{H}_{10}}{{O}_{5}} $
• B. $ {{C}_{6}}{{H}_{12}}{{O}_{6}} $
• C. $ {{C}_{4}}{{H}_{8}}{{O}_{4}} $
• D. $ {{C}_{3}}{{H}_{6}}{{O}_{3}} $
• E. $ {{C}_{2}}{{H}_{4}}{{O}_{2}} $

Answer 1

Answer: (A)

$ \because $ 0.1 mole of carbohydrate contains $ =1g $ of hydrogen.
$ \therefore $ 1 mole of carbohydrate contains $ =\frac{1}{0.1} $
=10g of hydrogen
Hence, its molecular formula $ ={{C}_{5}}{{H}_{10}}{{O}_{5}} $ .