Question 10 Achieve HW

[April_Tello_2H]

Hello, I'm having trouble getting the correct answer. I believe I am calculating it correctly but achieve says it is incorrect.

The rate constant for this second-order reaction is 0.680 M-1 * s^-1 at 300 C.
A --> products
How long, in seconds, would it take for the concentration of A to decrease from 0.910 M to 0.360 M.

t=1/[A]t−1/[A]0 then all above k in which my equation looks like
(1/0.360 - 1/0.910) /0.680 and my final answer is 2.46 but then achieve says it is incorrect. Is there something wrong in my equation or in my calculation ? Please let me know !

[RandyRich]

Your math looks correct as far as I can tell, I would say maybe double check the given values for M and K. You could also try rounding it since I got 2.468 -> 2.47.

[Katie L 2I]

Your math and equation set up does look correct. Maybe be careful about order of operations, when you plug the numbers into your calculator.

[106046096]

Hi! Based on the information, your calculation should be correct because you inserted everything in the equation correctly. Maybe you should round the number to 2.5 to see if it fixes the issue.

[Chem_Mod]

Contact Achieve support. They are assisting real-time.