Question

For a first-order reaction, the half-life is constant. It depends only on the rate constant k...

For a first-order reaction, the half-life is constant. It depends only on the rate constant k and not on the reactant concentration. It is expressed as t1/2=0.693k For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as t1/2=1k[A]0

Part A

A certain first-order reaction (A→products) has a rate constant of 4.20×10−3 s−1 at 45 ∘C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?

Express your answer with the appropriate units.

Part B

A certain second-order reaction (B→products) has a rate constant of 1.35×10−3M−1⋅s−1 at 27 ∘C and an initial half-life of 244 s . What is the concentration of the reactant B after one half-life?

Express your answer with the appropriate units.

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
For a first-order reaction, the half-life is constant. It depends only on the rate constant k...
For a first-order reaction, the half-life is constant. It depends only on the rate constant k and not on the reactant concentration. It is expressed as t1/2=0.693k For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as t1/2=1k[A]0 Part A A certain first-order reaction (A→products ) has a rate constant of 5.10×10−3 s−1 at 45 ∘C . How many minutes does it take for the concentration of the...
Part A Calculate the fraction of methyl isonitrile molecules that have an energy of 160.0 kJ...
Part A Calculate the fraction of methyl isonitrile molecules that have an energy of 160.0 kJ or greater at 510 K . Part B Calculate this fraction for a temperature of 524 K . Part C What is the ratio of the fraction at 524 K to that at 510 K ? Part A What is the half-life of a first-order reaction with a rate constant of 7.20×10−4  s−1? Part B What is the rate constant of a first-order reaction that...
Part A A certain first-order reaction (A→products) has a rate constant of 7.20×10−3 s−1 at 45...
Part A A certain first-order reaction (A→products) has a rate constant of 7.20×10−3 s−1 at 45 ∘C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration? Express your answer with the appropriate units. Answer: 6.42 min Part B A certain second-order reaction (B→products) has a rate constant of 1.35×10−3M−1⋅s−1 at 27 ∘Cand an initial half-life of 236 s . What is the concentration of the reactant B after...
Half-life equation for first-order reactions: t1/2=0.693k   where t1/2 is the half-life in seconds (s), and kis...
Half-life equation for first-order reactions: t1/2=0.693k   where t1/2 is the half-life in seconds (s), and kis the rate constant in inverse seconds (s−1). a) What is the half-life of a first-order reaction with a rate constant of 8.10×10−4  s^−1? Express your answer with the appropriate units. b) What is the rate constant of a first-order reaction that takes 151 seconds for the reactant concentration to drop to half of its initial value? Express your answer with the appropriate units. c) A...
Part A : A certain first-order reaction (A→products) has a rate constant of 9.30×10−3 s−1 at...
Part A : A certain first-order reaction (A→products) has a rate constant of 9.30×10−3 s−1 at 45 ∘C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration? Part B : A certain second-order reaction (B→products) has a rate constant of 1.10×10−3M−1⋅s−1 at 27 ∘C and an initial half-life of 278 s . What is the concentration of the reactant B after one half-life?
What is the half-life of a first-order reaction with a rate constant of 4.20×10−4  s−1? (the answer...
What is the half-life of a first-order reaction with a rate constant of 4.20×10−4  s−1? (the answer is 1650s) What is the rate constant of a first-order reaction that takes 458 seconds for the reactant concentration to drop to half of its initial value?
PLEASE MAKE SURE YOUR ANSWERS ARE CORRECT Part A What is the half-life of a first-order...
PLEASE MAKE SURE YOUR ANSWERS ARE CORRECT Part A What is the half-life of a first-order reaction with a rate constant of 7.60×10−4  s−1? Express your answer with the appropriate units. Part B A certain first-order reaction has a rate constant of 1.50×10−3 s−1. How long will it take for the reactant concentration to drop to 18 of its initial value? Express your answer with the appropriate units.
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they...
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line,y=mx+b. Order Integrated Rate Law Graph Slope 0 [A]=−kt+[A]0 [A] vs. t −k 1 ln[A]=−kt+ln[A]0 ln[A] vs. t −k 2 1[A]= kt+1[A]0 1[A] vs. t k Part A The reactant concentration in a zero-order reaction was 7.00×10−2M after 135 s and 2.50×10−2M after 315 s . What is the rate constant for this reaction? Express your answer with...
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they...
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line,y=mx+b. Order Integrated Rate Law Graph Slope 0 [A]=−kt+[A]0 [A] vs. t −k 1 ln[A]=−kt+ln[A]0 ln[A] vs. t −k 2 1[A]= kt+1[A]0 1[A] vs. t k Part A The reactant concentration in a zero-order reaction was 5.00×10−2M after 200 s and 2.50×10−2M after 310 s . What is the rate constant for this reaction? Express your answer with...
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they...
The integrated rate laws for zero-, first-, and second-order reaction may be arranged such that they resemble the equation for a straight line,y=mx+b. Order Integrated Rate Law Graph Slope 0 [A]=−kt+[A]0 [A] vs. t −k 1 ln[A]=−kt+ln[A]0 ln[A] vs. t −k 2 1[A]= kt+1[A]0 1[A] vs. t k ------------ Part A The reactant concentration in a zero-order reaction was 5.00×10−2M after 110 s and 4.00×10−2M after 375 s . What is the rate constant for this reaction? ---------- Part B...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT