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
Reil [10]
3 years ago
15

Sodium-24 has a half life how much sodium-24 will remain in an 18 g sample after 75 hours

Chemistry
1 answer:
frutty [35]3 years ago
3 0

Answer:

\boxed{\text{0.56 g}}

Explanation:

The half-life of Na-24 (15 h) is the time it takes for half of it to decay.  

After one half-life, half (50 %) of the original amount will remain.  

After a second half-life, half of that amount (25 %) will remain, and so on.  

We can construct a table as follows:  

  No. of                 Fraction          Mass

<u>half-lives   t/da   Remaining   Remaining/g </u>

      0             0           1                      18

       1            15            ½                    9.0

      2           30            ¼                    4.5

      3           45            ⅛                    2.2

      4           60            ⅟₁₆                   1.1

      5           75            ⅟₃₂                   0.56

      6           90           ⅟₆₄                   0.28

We see that  \boxed{\textbf{0.56 g}} remain after five half-lives (75 h).

You might be interested in
3. Which of the following is NOT a major ingredient in weather?
belka [17]

Explanation: B Sunshine

4 0
2 years ago
Read 2 more answers
Which of the following statements about benzene is true? Multiple Choice
fenix001 [56]

Answer: option a and d

Explanation:

Option A- Benzene undergoes substitution reaction

Example : benzene reacts with chlorine to form chlorobenzene, in the presence of Iron

(iii) chloride as a catalyst

C6H6 + Cl2 ---> C6H5Cl + HCl

Option D- Benzene also undergoes addition reaction

Example: benzene reacts with hydrogen , in the presence of nickel as a catalyst to form

cyclohexane

C6H6 + 3H2 ---> C6H12

Reasons why Option B isn't the answer

Although benzeme has degree of unsaturation but it's not five degree of unsaturation.

Benzene has 6 carbon atoms and 4 degrees of unsaturation (1 ring and 3 double

bonds).

If you work backwards and double the degrees of unsaturation you have 8 degrees of

unsaturation instead of 5.

Option C - Benzene isn't a saturated hydrocarbon

6 0
3 years ago
Which chemical formal shows an ionic compound? A. CO2 B.N 2 O C.NaCI D.C6 H12 O6
KonstantinChe [14]

Answer:

B

N2O

Explanation:

maybe

d can also be lol

4 0
2 years ago
During the first half of the 20th century, the theory of plate tectonics was developed. Evidence supporting this theory included
Makovka662 [10]

A) GPS monitoring and satellite imagery of crustal movements

Explanation:

The most recent evidence supporting the theory of plate tectonics is the use of  GPS monitoring and satellite imagery of crustal movements.

GPS denotes Global Positioning Systems.

Satellite imagery is a recent advancement in the study of moving plates.

  • The global positioning system uses the position of a system of satellites in space to delineate positions on earth.
  • It works on the principles of triangulation and this helps to fix positions of objects on the earth surface.
  • With this, the change in position of the plates can be recorded by known fixed positions of objects.
  • Satellite imagery helps to map changes in terrain with time.
  • Images can be correlated through time and the shift in terrains delineated.

learn more:

Wegener brainly.com/question/5002949

#learnwithBrainly

5 0
3 years ago
What is the sign of Mercury​
Sever21 [200]

Answer:

The answer is Hg.

Explanation:

Symbol for Mercury is Hg.

7 0
2 years ago
Read 2 more answers
Other questions:
  • How much heat is required to decompose 25.5 grams of NaHCO3? 2NaHCO3(s) + 129 kJ 2Na2CO3(s) + H2O(
    9·1 answer
  • Salt water can be desalinated by distillation. How much energy is needed to convert 175 g of salt water at 28.0 °C to water vapo
    9·1 answer
  • Titration Lab Sheet: Day 2 (Alternate)‼️‼️‼️
    8·2 answers
  • Force acts on it.
    13·1 answer
  • What is an easy way to measure the volume of an irregular shaped object?
    5·1 answer
  • What is the oxidation number of phosphorus (P) in sodium phosphate (Na3PO4)?
    10·2 answers
  • what happens to the gravitational force between two objects when their masses are increased? What happens when the distance betw
    11·1 answer
  • Doc. No.
    7·1 answer
  • What is the chemical formula of diphosphorus monoxide?
    10·1 answer
  • A sample of iron (III) chloride has a mass of 26.29g. How many moles would this be?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!