how many grams of ca are in 100 g of caco3?

Question

how many grams of ca are in 100 g of caco3

Answer 1

The molecular mass of CaCO3 is 100

 

The atom mass of Ca is 40

 

that is the weight of  Ca  is 40% of the Ca should be 100 g *40%=40 g 

Answer 2

CaCO₃

 

First determine how many grams in a mole for the whole molecule

 

Ca has an atomic mass of 40.078

C has an atomic mass of 12.0107

O has an atomic mass of 15.9994; O₃ has an atomic mass of 47.9982

 

If we sum the atomic masses of Ca, C and O₃, we have, 40.078+12.0107 + 47.9982 = 100.0869, which is approximately 100.

 

So 100 grams of CaCO₃ is one mole of CaCO₃

 

40.078 of these 100 grams is calcium (Ca).

 

There are 40.078 grams of Ca in CaCO₃