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?
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.
