The rate of disappearance of chlorine gas : 0.2 mol/dm³
Further explanation
The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.
For reaction :
[tex]\tt aA+bB\rightarrow cC+dD[/tex]
The rate reaction :
[tex]\tt -\dfrac{1}{a}\dfrac{d[-A]}{dt}= -\dfrac{1}{b}\dfrac{d[-B]}{dt}=\dfrac{1}{c}\dfrac{d[C]}{dt}=\dfrac{1}{d}\dfrac{d[D]}{dt}[/tex]
Reaction for formation CClâ‚„ :
CH₄+4Cl₂⇒CCl₄+4HCl
From equation, rate of reaction = rate of formation CCl₄ = 0.05 mol/dm³
Rate of formation of  CCl₄  = reaction rate x coefficient of  CCCl₄
0.05 mol/dm³ = reaction rate x 1⇒reaction rate = 0.05 mol/dm³
The rate of disappearance of chlorine gas (Clâ‚‚) :
Rate of disappearance of  Cl₂  = reaction rate x coefficient of  Cl₂
Rate of disappearance of  Cl₂ = 0.05 x 4 = 0.2 mol/dm³
