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3 years ago

10

the table shows the concentration of a reactant in the reaction mixture over a period of time. what is the average rate of the r

eaction over the first 450 seconds?

1 answer:

Stella [2.4K]3 years ago

6 0

The question is missing the table. Here is the complete question.

The tableshows the concentration of a reactant in the mixture over a period of time.

Reactant Concentration

Time (s) Concentration (M)

0 1.8

210 1.2

450 0.8

580 0.6

720 0.4

What is the average rate of reaction over the first 450 seconds?

A. 1.6x $10^{-3}$ M

B. 1.9x $10^{-3}$ M

C. 2.0x $10^{-3}$ M

D. 2.2x $10^{-3}$ M

Answer: D. 2.2x $10^{-3}$ M

Explanation: The average rate of a reaction is the rate of change of the concentrations (of reactants or products) in a period of time:

average = - ΔC/Δt

In this case, concentration is negative because it's related to reactant, since its concentration dimishes while the concentration of product increases.

For the first 450 seconds:

Average = $\frac{-(0.8 - 1.8)}{450 - 0}$

Average = $\frac{1}{450}$

Average = 0.0022

or

Average = 2.2x $10^{-3}$

So, <u>the Average Rate of the reaction is 2.2x</u> $10^{-3}$ <u>M</u>

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