Question

let us consider the following compound ch3 cl.what is the % composition by weight of each element in this compound ? given= (i) molar mass of carbon =12g,(ii)molar mass of hydrogen 1 g,(iii) molar mass of chlorine =35 .5 g​

Answer 1

CH3CL

GIVEN,

MASS OF C- 12g

MASS OF H- 1g

MASS OF CL- 35.5

TOTAL MASS OF CH3CL:

12+3(1)+35.5

=50.5

NOW,

% MASS OF ANY ELEMENT/MOLECULE IN COMPOUND:

MASS OF ELEMENT/MOLECULE × 100/ MASS OF COMPOUND

i. % OF C:

12×100/50.5 ≈ 24%

ii. % OF H:

3×100/50.5 ≈ 6%

iii. % OF CL:

35.5×100/50.5 ≈ 70%