Rajasthan BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
Question
The molecular weight of calcium carbonate $CaCO_{3 }$ is:
✓
Answer
Molecular weight is the mass of whole molecule.
Steps$:- (1)$ Chemical formula of calcium carbonate $⟶CaCO_{3}$
$(2)$ Mass of Calcium$⟶ 40$
Mass of Carbon$⟶ 12$
Mass of Oxygen$⟶ 16$
$(3)$ Multiply mass of each element by number of atoms of that element.
$(4)$ Add all the masses obtained after multiplication.
$⟶CaCO_{3}$
$= 1 \times 40 + 1 \times 12 + 3 \times 16$
$= 40 + 12 + 48$
$= 100.$
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