25 February, 03:59

# What is the rate of the reaction when the initial concentration of is 0.400 and that of is 0.265? Express your answer to three significant figures and include the appropriate units.

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1. 25 February, 04:10
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Hi, I can't find the data to answer this question but I'm writing below about rate of reaction and how to calculate it.

Explanation:

Rate of reaction

Rate of reaction is the speed at which a chemical reaction proceeds. It is the measure of change in concentration of reactants or products in unit time.

For a reaction: aA+bB⟶cC+dD

Rate = (-1/a) (d[A]/dt) = (-1/b) (d[B] / dt) = (1/c) (d[C] / dt) = (1/d) (d[D]/dt)

Example

Take the example of following reaction of ammonia.

4NH3+3O2⟶2N2+6H2O

Rate of formation of N2 is 0.27 mol L-1 s-1 (Given)

Step 1

From the equation, Δ[H2O] = 6/2 Δ[N2]

So the rate of formation of H2O = 3 * (0.27 mol L-1 s-1)

= 0.81 mol L-1 s-1

Step 2

4 moles of NH3 are consumed for every 2 moles of N2 formed, so the rate of disappearance of ammonia is

= 2 * (0.27 mol L-1 s-1)

= 0.54 mol L-1 s-1.