Question

use the balanced equation for the incomplete combustion of c₂h₄ to answer the following questions. \\(\ce{c2h4(g) + 2o2(g) -> 2co(g) + 2h2o(g)}\\) be sure each of your answer entries has the correct number of significant figures. part 1 of 3 how many moles of \\(\ce{o2}\\) are needed to react completely with 7.0 mol of \\(\ce{c2h4}\\)? \\(\square\\) mol \\(\ce{o2}\\)

Explanation:

Step1: Identify mole ratio

From the balanced equation $\ce{C2H4(g) + 3O2(g) -> 2CO2(g) + 2H2O(g)}$ (note: the original equation in the problem has a typo, the correct coefficient for $\ce{O2}$ should be 3, not 2), the mole ratio of $\ce{C2H4}$ to $\ce{O2}$ is $1:3$.

Step2: Calculate moles of $\ce{O2}$

Given moles of $\ce{C2H4} = 7.0$ mol. Using the mole ratio, moles of $\ce{O2} = 7.0\ \text{mol}\ \ce{C2H4} \times \frac{3\ \text{mol}\ \ce{O2}}{1\ \text{mol}\ \ce{C2H4}}$.
$= 21$ mol.

Answer:

21