1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sergeeva-Olga [200]
3 years ago
5

This decomposition is first order with respect to phosphine, and has a half‑life of 35.0 s at 953 K. Calculate the partial press

ure of hydrogen gas that is present after 70.5 s if a 2.20 L vessel containing 2.29 atm of phosphine gas is heated to 953 K.
Chemistry
1 answer:
Solnce55 [7]3 years ago
3 0

Answer:

0.57 atm

Explanation:

When a a reaction is first order, we have from calculus the following relation:

ln[A]t/[A]₀ = - kt

where [A]t is the concentration of A ( phosphine in this case ) after a time, t

           [A]₀ is the initial concentration of A

           k is the rate constant, and

           t is the time

We also know that for a first order reaction

           k = 0.693/ t 1/2

wnere t 1/2 is the half-life.

This equation is derived for the case when A]t/= 1/2 x [A]₀ which occurs at the half-life.

Thus, lets first find k from the half life time, and then solve for t = 70.5 s

k = 0.693 /  35.0 s = 0.0198 s⁻¹

ln [ PH₃ ]t / [ PH₃]₀ = - kt

from the ideal gas law we know pV = nRT, so the volumes cancel:

ln (pPH₃ )t / p(PH₃)₀ = - kt

taking inverse log to both sides of the equation:

(pPH₃ )t / p(PH₃)₀  = - kt

thus:

(pPH₃ )t  = 2.29 atm x e^(- 0.0198 s⁻¹ x 70.5 s ) = 0.57 atm

You might be interested in
REALLY NEED HELP. TAKING A TIMED TEST. 15 POINTS
zimovet [89]
The F atom . Oxygen has a -2 charge and fluorine has a +1 charge
7 0
2 years ago
Creating a prototype and troubleshooting o
lys-0071 [83]

D. a new technology.
6 0
3 years ago
Read 2 more answers
Lastly, Snape thinks we should try one more calculation. What is the retention factor if the distance traveled by the solvent fr
Neporo4naja [7]

Answer:

0.1 is the retention factor.

Explanation:

Distance covered by solvent ,d_s= 2.0 cm

Distance covered by solute or ion,d = 0.20 cm

Retention factor(R_f) is defined as ratio of distance traveled by solute to the distance traveled by solvent.

R_f=\frac{d}{d_s}

R_f=\frac{0.20 cm}{2.0 cm}=0.1

0.1 is the retention factor.

7 0
3 years ago
Classify N2 as a substance
ludmilkaskok [199]
N2O is compound becoz it has more than one type of atoms. 

<span>Air is homogeneous mixture becoz it has different gases which are does not bonded to each other</span>
6 0
3 years ago
In terms of bonds, what would the molecule C₆H₁₂ be classified as?
Colt1911 [192]

Answer:

Alkene

Explanation:

5 0
3 years ago
Other questions:
  • 59,280,000,000,000 in scientific notation
    12·2 answers
  • Calculate the mass of water produced when 1.92 g of butane reacts with excess oxygen.
    8·1 answer
  • WILL RATE AND GIVE BRAINLIEST!!
    12·2 answers
  • What is a group in the periodic table of elements?
    5·2 answers
  • Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas. How many grams of oxygen are formed when 10.0 g of dinit
    15·1 answer
  • Which of the changes are chemical changes?
    9·1 answer
  • Which term is a measure of how much work an object can do? target mass velocity energy
    9·1 answer
  • How did Albert Einstein explain the photoelectric effect?
    7·2 answers
  • What is the speed of a wave with a frequency of 2 Hz and a wavelength of 87m (subject is science) pls answer fast
    12·1 answer
  • How many atoms of each element are in one molecule of the product?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!