## vera_ewing one year ago If the decomposition reaction of 1.4 M initial hydrogen peroxide (H2O2) occurs so that after 3 minutes, 0.83 M is left, what is the rate of the reaction? A. -0.0046 M/s B. -0.012 M/s C. -0.19 M/s D. -0.0032 M/s

1. vera_ewing

@rvc @sweetburger What do you guys think?

2. rvc

please stay with us @Vocaloid :) vera you may know the formula for the following question

3. rvc

could you please write down the formula @vera_ewing

4. TrojanPoem

−Δ[Reactants]/ Δt or Δ[Products]/Δt

5. rvc

$$\Large\rm Rate = Change~in~concentration~per~time$$

6. TrojanPoem

- (1.4 - 0.83) / 3 * 60 - initial ( 0 ) = approximately = - 0.003166 =- 0.0032 M/S Notice: In other example if there is coefficients with the reactants or products .. All these formulas are out.

7. TrojanPoem

@rvc, Change in concentration per time is average rate of reaction

8. vera_ewing

9. TrojanPoem

I believe so.

10. rvc

yep sorry for the mistake thanks

11. vera_ewing

Thank you! Who should I give the medal to?

12. TrojanPoem

No problem.

13. TrojanPoem

Give it to rvc

14. vera_ewing

15. rvc

no give it to trojan

16. vera_ewing

17. rvc

do you know about the energy profile diagram?

18. vera_ewing

Yes

19. rvc

the starting of the curve is about the energy of reactants the middle part is the transition state and the latter part is the energy of products

20. vera_ewing

21. rvc

No

22. vera_ewing

A?

23. rvc

what difference do you see?

24. rvc

i think its C since the values are different

25. vera_ewing

Are you 100% sure it's C?

26. rvc

yes according to me its C

27. vera_ewing

Okay thanks! :)

28. rvc

:)

29. vera_ewing

30. rvc

The question is asking about the least amount of time Which is the smallest no from the four options?

31. vera_ewing

C can't be correct??

32. rvc

Min is greater than sec so you r right what remains next?

33. vera_ewing

I think the answer is A...do you agree?

34. rvc

Check out the unit

35. rvc

its in minutes

36. vera_ewing

Ohh so it's not A or C right?

37. rvc

4.48 X 10^-5= 0.0000448 s^-1

38. vera_ewing