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
pishuonlain [190]
3 years ago
5

If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years

Chemistry
1 answer:
Sonbull [250]3 years ago
5 0

Answer:

12.50g

Explanation:

T½ = 2.5years

No = 100g

N = ?

Time (T) = 7.5 years

To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

In(N/No) = -λt

N = No* e^-λt

N = 100 * e^-(0.2772*7.5)

N = 100*e^-2.079

N = 100 * 0.125

N = 12.50g

The sample remaining after 7.5 years is 12.50g

You might be interested in
Why is drinking urine unhealthy?<br> whats in it?
Kryger [21]
This is by far probably the best question I've answered all day.
It's not unhealthy to drink it.
Urine consists of 95% water and 5% nutrients
7 0
3 years ago
Read 2 more answers
HELP!! WILL GIVE BRAINLIEST!!! EASY!!
AysviL [449]

Answer:

I'm almost positive its d

Explanation:

hope this helps <3

4 0
3 years ago
Read 2 more answers
Students in Mr. Brant's class designed an experiment to test which baseball bat will hit the ball the longest distance? In this
Mama L [17]
Answer is d.A baseball helmet
8 0
3 years ago
What is the density of a saline solution if 60.0 mL has a mass of 30.000g? (Please show a picture of the work!!)
Sever21 [200]

Volume of solution is 60.0 mL and mass is 30.000 g.  Density of a solution is defined as mass per unit volume.

Thus, density can be calculated as follows:

d=\frac{m}{V} ….. (1)

Here, d is density, m is mass and V is volume.

Putting the value of mass and velocity in the equation (1),

d=\frac{30.000 g}{60.0 mL}=0.5 g/mL

Thus, the density of a saline solution is 0.5 g/mL.


5 0
3 years ago
Read 2 more answers
Fill in the blanks with the word that best completes each statement. Scientists develop knowledge by making ------------about th
kotegsom [21]

Answer:

1. observations

2. hypothesis

3. experimentation

Explanation:

Observations are made, Hypothesies are formed from observations, and experimnets help alter and comfirm hypothesis.

3 0
3 years ago
Other questions:
  • A student is asked to convert measurements from liters to milliliters and from milliliters to liters. His answers are shown in b
    13·2 answers
  • Which probably best indicates that a compound contains an ionic bond
    11·1 answer
  • 6. (1 point) What is the correct formula for sodium sulfate? *
    5·2 answers
  • A quantity must be divided by multiples of ten when converting from a larger unit to a smaller unit.
    8·1 answer
  • What is the identity of the atom shown?
    10·2 answers
  • When placed in a 100mL cube shaped box a substance fills the cube and has a volume of 100 mL. When places in a 50mL tube that sa
    14·1 answer
  • Which of the characteristics below best describes organic compounds
    5·1 answer
  • Which element has higher ionization energy? chlorine or carbon
    8·1 answer
  • What is the result at the end of meiosis II?
    11·1 answer
  • Identify the number of core and valence electrons for each atom.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!