2)If Br2 Goes to 2Br and it is a first order reaction with a rate constant of .0

Question

2)If Br2 Goes to 2Br and it is a first order reaction with a rate constant of .019M M-1 S -1. What is the original concentration if after 210 seconds, the concentration is .23M?
3) how long does it take for 65.0% of a sample to decompose for a first order process with a rate constant of 6.30x10-11 sec-1. Express in years.
3) how long does it take for 65.0% of a sample to decompose for a first order process with a rate constant of 6.30x10-11 sec-1. Express in years. l. What mass of H2O would be needed to make a 26.31% solution using 4.3 129 g of salt? (5pts) 73.69 K ?.3121-12-014 4.31 12 L. 2. If Br2 goes to 2Br and it is a first order reaction with a rate constant of.019 M's'. What is the original concentration if after 210 seconds, the concentration is .23M? (5pts) 019 Ms (on)o):2.105 93M I2 3. How, long does it take for 65.0% ofa sample to decompose for a first order process with a rate constant of 6.30x 10l sec. Express in years. (5pts) hut ? Ao 4. What is the concentration of Fe3 if 30.00 mL of .3500 M Iron(III) nitrate is mixed with 20.00 mL of 0.1000 M Nitric Acid and 50 00 ml fH20? (5pts) (35 00) 30(100) (.??500)(x) --T7ume : ??0.ooml+2o.oor soa 100.00 mL 105

Explanation / Answer

Ans 2

Rate constant k = 0.019 s-1

Initial concentration [A0] =?

Final concentration [A] = 0.23 M

Time t = 210 s

For the first order reaction

[A] = [A0] exp (-kt)

0.23 = [A0] exp (-0.019*210)

[A0] = 0.23 / exp(-3.99)

= 12.43 M

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.