Average reaction rate with respect to the moles of H₂ is 0.0025 mol/L.s and with respect to the moles of Cl₂ is 0.0025 mol/L.s.
How we calculate the average reaction rate?
Average reaction rate will be calculated as the change in the concentration of reactant or product with respect to the time which is divided by the stoichiometric coefficient.
Given chemical reaction is written as:
H₂ + Cl₂ → 2HCl
Average rate of reaction with respect to all participants will be written as:
Rate = -d[H₂]/dt = -d[Cl₂]/dt = d[HCl]/2dt
Negative sign shows the deduction with respect to the time.
(1). Given initial concentration of H₂ = 0.030M
Concentration of H₂ after 4 sec = 0.020M
Average rate = - (0.02 M - 0.03 M)/(4.0 s) = 0.0025 mol/L.s
(2). Given initial concentration of Cl₂ = 0.050M
Concentration of Cl₂ after 4 sec = 0.040M
Average rate = - (0.04 M - 0.05 M)/(4.0 s) = 0.0025 mol/L.s
Hence, average rate with respect to moles of H₂ & Cl₂ is 0.0025 mol/L.s and 0.0025 mol/L.s respectively.
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