Which coefficients are required to correctly balance the equation, C2H2 + O2 → CO2 + H2O?A2, 5, 4, 2B1, 2, 3, 2C2, 4, 5, 2D2, 3, 5, 2

To balance the chemical equation C2H2 + O2 → CO2 + H2O, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

1. Start with the carbon (C) atoms. There are 2 carbon atoms on the left side (in C2H2) and 1 on the right side (in CO2). To balance the carbon atoms, we need to put a coefficient of 2 in front of CO2. Now the equation looks like this: C2H2 + O2 → 2CO2 + H2O.

2. Next, balance the hydrogen (H) atoms. There are 2 hydrogen atoms on the left side (in C2H2) and 2 on the right side (in H2O). So, the hydrogen atoms are already balanced.

3. Finally, balance the oxygen (O) atoms. There are 2 oxygen atoms on the left side (in O2) and 4 in the CO2 plus 1 in the H2O on the right side, making a total of 5 oxygen atoms on the right side. To balance the oxygen atoms, we need to put a coefficient of 5/2 in front of O2. But since we can't have a fraction as a coefficient in a balanced chemical equation, we multiply all coefficients by 2. This gives us: 2C2H2 + 5O2 → 4CO2 + 2H2O.

So, the correct coefficients to balance the equation C2H2 + O2 → CO2 + H2O are 2, 5, 4, 2. Therefore, the answer is A2, 5, 4, 2.