Question

11. Sucrose is a compound produced naturally in plants,
from which table sugar is refined. It has the formula
C,H,O, which means it is made up of 12 carbon
atoms, 22 hydrogen atoms and 11 oxygen atoms.
Find the percentage of hydrogen atoms in the
compound​

Answer 1

The formula for Sucrose is C12H22O11

now, multiply the mass number of each element to the number of molecules

i.e

Carbon = 12 X 12.01 = 144.13 grams/mole

Hydrogen = 22 X 1.0079 = 22.17 grams/mole

Oxygen = 11 X 15.999 = 175.99 grams/mole

The total mass is 342.29 grams/mole

now, we know the masses of all the elements so we can find the percentage

therefore,

H% = (22.17/342.29) X 100 = 6.5%