Given the following equation: 2 K + Cl2---> 2 KCl How many moles of K are needed to react with 0.5 moles of C

1 mol of K

Explanation:

The reaction is: 2K + Cl₂ → 2KCl

2 moles of potassium react with 1 mol of chlorine to make the salt, potassium chloride

If you see the stoichiometry from reactants, 2 moles of K need 1 mol of Cl₂ to react, so 1 mol of Cl₂ needs 2 moles of K, to react too.

We can make a rule of three, to reach the answer:

1 mol of Cl₂ needs 2 moles of K to react

Then, 0.5 moles of Cl₂ must react with (0.5. 2) / 1 = 1 mol of K