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
kirza4 [7]
3 years ago
7

As with any drug, aspirin (acetylsalicylic acid) must remain in the bloodstream long enough to be effective. Assume that the rem

oval of aspirin from the bloodstream into the urine is a first-order reaction, with a half-life of about 3 hours. The instructions on an aspirin bottle say to take 1 or 2 tablets every 4 hours. If a person takes 1 aspirin tablet, how much aspirin remains in the bloodstream when it is time for the second dose? (A standard tablet contains 400. mg of aspirin.)
Chemistry
1 answer:
Olenka [21]3 years ago
4 0

Answer:

180 mg

Explanation:

For a first-order reaction, we can calculate the amount of aspirine (A) at a certain time (t) using the following expression.

A=A_{0}.e^{-k.t}

where,

k: rate constant

A₀: initial amount

If we know the half-life (t_{1/2}) we can calculate the rate constant.

k=\frac{ln2}{t_{1/2}} =\frac{ln2}{3h} =0.2h^{-1}

When t = 4 h and A₀ = 400 mg, A is:

A=400mg.e^{-0.2h^{-1}\times 4h} =180mg

You might be interested in
Based on the table what conclusion can the student make about relationships between elements
ANEK [815]

What Tennessee agency is responsible for licensing pets and ensuring that they are vaccinated for rabies?

5 0
3 years ago
why is nitrous oxide sedation especially useful for control of soft tissue discomfort during dental hygiene procedure
Stolb23 [73]

Answer:

Because it has a quickly sedative effect and it has antimicrobial effect.

Explanation:

This gas is useful because is used to trait pain, reduce anxiety and promote relaxation, slow down the body reaction, so the dentist can use it to calm down the patients.

If the patient present some injuries, this gas can help in wound healing.

7 0
3 years ago
Would someone please help?
sveta [45]
The season that is starting is winter.
The answer to 21 is (4)
3 0
3 years ago
“Kids and grown-ups love it so, the happy world of HARIBO!” Who does not like the dark brown liquorice and its lovely taste?! Ta
KiRa [710]

Answer:

Any Questions?

So i can give you the answer

3 0
2 years ago
What would be the volume in millilitres of a blood sample of 2.15 microliters (ul)?​
Zanzabum

2.15 x 10⁻³mL

Explanation:

Given parameter:

    Volume of blood sample in uL = 2.15uL

Conversion           uL → mL

   micro- and milli-  are both prefixes of sub-units.

liter is a unit of volume of a substance.

       micro - is 10⁻⁶

       milli- is of the order 10⁻³

The problem is converting from micro to milli:

     if we multiply  10⁻⁶ by 10³ we would have our milli;

  1000uL = 1mL

  2.15uL :   2.15uL x \frac{1mL}{1000uL} = 2.15 x 10⁻³mL

learn more:

Volume brainly.com/question/5055270

#learnwithBrainly

4 0
3 years ago
Other questions:
  • Which of the following are likely to form an ionic bond?
    9·1 answer
  • Help in number 10 please
    13·2 answers
  • From the middle of the periodic table, in which direction would you look to find the most reactive substances?
    12·1 answer
  • Which is the electron configuration for zinc?
    6·1 answer
  • Detecta cuál de las siguientes fórmulas estructurales no cumple con la tetravalencia del carbono (formar cuatro enlaces)
    14·1 answer
  • 1) Recall the two written definitions of an oxidation-reduction reaction provided in our lessons. Which of these definitions is
    13·1 answer
  • Please help as soon as possible I will give out 100 points and Brian less
    12·2 answers
  • What is the percentage composition of carbon and hydrogen in ethane(c2h6,molecular mass 30.0)<br>​
    5·1 answer
  • Help me guys plzlzlz
    15·2 answers
  • The theory of _______ of matter states that cannot be created or destoryed
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!