Determine the amount of carbon dioxide, which is formed during the combustion of 3 g of carbon.

1. Let’s write the equation of the reaction of carbon combustion:
C + O2 = CO2;
2.Calculate the chemical amount of combusted carbon:
n (C) = m (C): Mr (C) = 3: 12 = 0.25 mol;
3.It can be seen from the recording of the reaction equation that the combustion of one carbon atom leads to the formation of one molecule of carbon dioxide, we determine the amount of gas:
n (CO2) = n (C) = 0.25 mol.
Answer: 0.25 mol.