Question

13 choose the best answer.
what is the coefficient of o₂?
2
8
10
13
14 choose the best answer.
what is the coefficient of co₂?
8
10
2
13

Explanation:

To solve these problems, we assume we are dealing with the combustion of a hydrocarbon (e.g., octane, \( C_8H_{18} \)) since these types of problems are common in chemistry (stoichiometry of combustion reactions). The balanced equation for the combustion of octane is:

$$ 2C_8H_{18} + 25O_2 ightarrow 16CO_2 + 18H_2O $$

Wait, but the options given are 2, 8, 10, 13. Maybe it's a different hydrocarbon. Let's check a common one with smaller coefficients. Let's consider \( C_4H_{10} \) (butane):

The balanced equation for butane combustion is:

$$ 2C_4H_{10} + 13O_2 ightarrow 8CO_2 + 10H_2O $$

Now let's analyze the questions:

Question 13: Coefficient of \( O_2 \)

From the balanced equation of butane combustion (\( 2C_4H_{10} + 13O_2
ightarrow 8CO_2 + 10H_2O \)), the coefficient of \( O_2 \) is 13.

Question 14: Coefficient of \( CO_2 \)

From the same balanced equation, the coefficient of \( CO_2 \) is 8.

Answer:

for Question 13:
13 (the option with 13)