kevlazo9728 kevlazo9728

02-12-2017
Chemistry

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A reaction x  y has a rate constant of 1.37 hr–1 and is allowed to react for 1.2 hours. if the final concentration of x is 0.21 m, what was the original concentration of x?

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meerkat18 meerkat18

12-12-2017

The unit measurement of the rate constant is a guide to tell you the rate order. If it's unit is 1/time, then it is a first-order reaction. From the picture attached, the formula to be used would be:

ln[A] = ln[A₀] - kt
ln[0.21] = ln[A₀] - (1.37)(1.2)
Solving for A₀,
A₀= 1.09 M

Hence, the original concentration of X was 1.09 M.

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