Answer:
The total atoms are 78.
Explanation:
In a chemical reaction, the reactans (that means, the initial compounds at the begginig of my chemical reaction), are conformed of different elements (in this case 3: C, H and O), and each element contribute with different number of atom.
In the first compound C6H14, we have 6 atoms of C and 14 atoms of H, but in my chemical reaction, I have 2 molecules, that mean that I need to multiply by 2 the total atoms, so at the end I have 12 atoms of C and 28 atoms of H.
In the second reactant, I have 2 atoms of O and 19 molecules, so I multiply 2 x 19 to have a total of 38 atoms of O.
At the end I need to add the total atoms of each element to know the answer, 12 + 28 + 38 = 78 atoms in total in all my reactans.
