Question

Fructose consists of 40.002% Carbon, 6.714% Hydrogen, and 53.285% oxygen. The molecular mass of fructose is 180.156 g/mol. Determine the empirical and molecular formulas for fructose.

Answer 1

Below

Step-by-step explanation:

For Carbon:

40.002 % * 180.156 = 72.066 gm/mole C per mole of fructose

For Hydrogen:

6.714 % * 180.156 = 12.096 gm H

For Oxygen:

53.285% * 180.156 = 95.966 gm of O

Now use periodic table to find mole wts of each

72.066 / 12.011 = 6 moles of C per mole of fructose ( wt = 12.011)

12.096/ 1.008 = 12 moles of H (wt = 1.008)

95.966/15.999 = 6 moles of O (wt = 15.999)

C6 H12 O6 is MOLECULAR formula divide everything by 6

C H2 O is EMPIRICAL