From the equation `4HCl + O_(2) to 2H_(2)O + 2Cl_(2) `, compute the moles of HCl needed to form `0.35" mol "Cl_(2)`.

Explanation

To solve the problem, we will use the stoichiometric relationships from the balanced chemical equation provided:

**Step 1: Write down the balanced chemical equation.**
The balanced equation is:
\[ 4 \text{HCl} + \text{O}_2 \rightarrow 2 \text{H}_2\text{O} + 2 \text{Cl}_2 \]

**Step 2: Identify the mole ratio between HCl and Cl2.**
From the balanced equation, we see that:
...