Question

When 2.5 mol of O2 are consumed in their reaction, ________ mol of CO2 are produced

Answer 1

The given question is incomplete. The complete question is:

The combustion of propane (C3H8) in the presence of excess oxygen yields $CO_2$ and $H_2O$

$C_3H_8(g)+5O_2 (g)\rightarrow 3CO_2(g)+4H_2O (g)$

When only 2.5 mol of $O_2$ are consumed in order to complete the reaction, ________ mol of $CO_2$ are produced.

Answer: Thus when 2.5 mol of $O_2$ are consumed in their reaction,  1.5 mol of $CO_2$ are produced

Explanation:

The balanced chemical equation is:

$C_3H_8(g)+5O_2 (g)\rightarrow 3CO_2(g)+4H_2O (g)$

According to stoichiometry :

5 moles of $O_2$ produce = 3 moles of  $CO_2$

Thus 2.5 moles of $O_2$ will produce = $\frac{3}{5}\times 2.5=1.5$ moles of  $CO_2$

Thus when 2.5 mol of $O_2$ are consumed in their reaction,  1.5 mol of $CO_2$ are produced