Question

c + 2f₂ → cf₄
how many moles f₂ are needed to
generate 3.0 moles cf₄?
? mol f₂

Explanation:

Step1: Identify mole ratio

From the reaction \( \text{C} + 2\text{F}_2
ightarrow \text{CF}_4 \), the mole ratio of \( \text{F}_2 \) to \( \text{CF}_4 \) is \( 2:1 \).

Step2: Set up proportion

Let \( x \) be moles of \( \text{F}_2 \). Then \( \frac{2\ \text{mol}\ \text{F}_2}{1\ \text{mol}\ \text{CF}_4}=\frac{x}{3.0\ \text{mol}\ \text{CF}_4} \).

Step3: Solve for \( x \)

Cross - multiply: \( x = 2\times3.0 = 6.0 \).

Answer:

\( 6.0 \)