Solve the following problems II — task. Science State Board, Class 10.

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Calculate the percentage of each element in calcium carbonate (atomic mass: $C=12$ , $O=16$ , $Ca=40$ ).

Given data:

Atomic masses:

$C=12$ ,

$O=16$ ,

$Ca=40$

Formula:

The formula to find the percentage of an element is

$\frac{\text{X}}{\text{Y}}\times100$

Where,

$=$

Solution:

Molecular mass of

$CaCO_3$

$=$

% of

$Ca$ in

$CaCO_3$

$=$

% of

$C$ in

$CaCO_3$

$=$

% of

$O$ in

$CaCO_3$

$=$

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16. Solve the following problems II