Calculate the amount of substance (mol) carbon that reacted with oxygen if 4.4 g of carbon dioxide was released as a result.

Explanation of the solution to the problem: to solve this problem, you first need to write the equation of the chemical reaction: С + O2 => CO2.
Then you need to find the amount of substance released carbon dioxide, for this you need to divide the mass of carbon dioxide by its molar mass (44 g / mol according to the periodic system of chemical elements of D.I.Mendeleev):
n (CO2) = m / M = 4.4 / 44 = 0.1 mol.
The amount of carbon is equal to the amount of carbon dioxide (the reaction shows that they interact in a 1: 1 ratio):
n (C) = n (CO2) = 0.1 mol.
Answer: n (C) = 0.1 mol.