Answer:
 %age of Carbon is 42.10 %.
Step-by-step explanation:
 In order to find the %age of elements present in a molecule we will use following formula,
%age of Element = (Mass of Element / Mass of Molecule) × 100
The molecular mass of Sucrose is.
 = (12)12 + (1)22 + (16)11
Where;
 12 = Atomic mass of Carbon
 1 = Atomic Mass of Hydrogen
 16 = Atomic Mass of Oxygen
 = 144 + 22 + 176
 =  342 g/mol
%age of C;
 = (144 / 342) ×100 = 42.10 %
%age of H;
 = (22 / 342) ×100 = 06.42 %
%age of O;
 = (176 / 342) ×100 = 51.46 %