The rate at which E is decreasing is 1.92 mol/ls.
The rate of reaction refers to how quickly or slowly that a reaction proceeds. The reactants disappear in a reaction while the products appear.
To obtain the rate at which E is decreasing when H is increasing at a rate of 0.64 mol/ls;
-ΔE/Δt = 3/1 ΔH/Δt = 3/1 (0.64 mol/ls) = 1.92 mol/ls
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