Question

the thermal decompostion of 26.4g of CaCo3 produced10.6g calcium and 3.17g carbon. calculate the mass of oxygen produced in this reaction.

Answer 1

2CaCO3 ==> 2Ca + 2C + 3O2

26.4g......10.6..3.17..x
The Law of Conservation of Mass tells us that nothing is lost. If you started with 26.4 g, the products must add to 26.4. You are given two of them, calculate the third.