Determine the mass of carbon monoxide (4) if 2.4 carbon enters into the reaction С + О2 = СО2 with oxygen?

Given:
m (C) = 2.4 g

To find:
m (CO2) -?

Decision:
1) Write the equation of a chemical reaction:
C + O2 => CO2;
2) Calculate the molar masses of C and CO2:
M (C) = Mr (C) = Ar (C) = 12 g / mol;
M (CO2) = Mr (CO2) = Ar (C) + Ar (O) * 2 = 12 + 16 * 2 = 44 g / mol;
3) Calculate the amount of substance C:
n (C) = m (C) / M (C) = 2.4 / 12 = 0.2 mol;
4) Determine the amount of substance CO2:
n (CO2) = n (C) = 0.2 mol;
5) Calculate the mass of CO2:
m (CO2) = n (CO2) * M (CO2) = 0.2 * 44 = 8.8 g.

Answer: The mass of CO2 is 8.8 g.