# I have a few questions regarding kinetics. I posted them below. Thank you!

**Question description**

Hello! I have a couple of homework problems that I can't seem to get right. I will paste them here.

For the first-order rate of reaction A --> B + C, what is the concentration of A (in M) after 52.0 s if [A]_{o} = 0.20 M and k = 0.030 s^{-1}?

For a first-order reaction, the initial reactant concentration is 0.722 M. After 48.5 min, the concentration is 0.501 M. What is k in min^{-1}?

For a first order reaction, the initial reactant concentration, [A]_{o}, is 0.94 M. After 10.0 s, the concentration is 0.67 M. What is [A] after 84 s?

For a second-order reaction, the initial reactant concentration is 0.66 M. After 14.5 min, the concentration is 0.27 M. What is k in M^{-1}min^{-1}?

_{o}, is 0.90 M. After 17.9 s, the concentration is 0.69 M. What is [A] after 55 s?

For the reaction A → B + C, when the natural log of [A] is plotted versus the time in seconds a straight line is obtained whose slope is -0.033 s^{-1}. What is the concentration of A (in M) after 58.0 s if [A]_{o} = 0.60 M?

Thank you !

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors