The percentage composition of calcium (Ca) in CaO is option C.
- Here we have to determine the mass of every component and even the total mass.
Element Atomic mass/u No. of atoms Subtotal mass/u
Ca 40.08 1 40.08
O 16.00 1 16.00
Total = 56.08
- The mass percent formula is
[tex]\%\ by\ mass = Mass\ of\ component \div Total\ mass \times 100 \%[/tex]
[tex]\% Ca = mass\ of\ Ca\div mass\ of\ CaO \times 100 \%\\\\\% H = 40.08 g\div 56.08 g \times 100 \%[/tex]
Therefore, we can conclude that the correct option is C.
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