10 g of hydrogen gas and 355 g of chlorine gas are heated together in a sealed 500 cm³ container. A chemical equilibrium is reached at 450 °C. The balanced equation for the reaction is: H₂(g) + Cl₂(g) ⇌ 2HCl(g). The equilibrium constant Kc for this reaction at 450 °C is 64.

6.1
The balanced equation for the reaction is:
$\text{H}_2(\text{g}) + \text{Cl}_2(\text{g}) \rightleftharpoons 2\text{HCl}(\text{g})$
Given:
Mass of $\text{H}_2 = 10 \text{ g}$
Mass of $\text{Cl}_2 = 355 \text{ g}$
Volume of container = $500 \text{ cm}^3 = 0.5 \text{ dm}^3$
Equilibrium constant $K_c = 64$ at $450 \text{ °C}$

Step 1: Calculate the initial moles of