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
cestrela7 [59]
3 years ago
5

Help please with question number 16)

Chemistry
1 answer:
Zanzabum3 years ago
5 0

Answer:

Mg²⁵   =   10.00%    

Mg²⁶   =   45.04%

Mg²⁴   =   44.96%

Explanation:

Given data:

Atomic mass of Mg²⁶ = 25.983

Atomic mass of Mg²⁵ = 24.986

Atomic mass of Mg²⁴ = 23.985

Abundance of Mg²⁵ = 10.00%

Abundance of Mg²⁶ = ?

Abundance of Mg²⁴ = ?

Solution:

Average atomic weight of Mg = 25.983  + 24.986+ 23.985 / 3

Average atomic weight of Mg = 74.954/3

Average atomic weight of Mg = 24.985 amu

Abundance of          

Mg²⁵   =   10.00    

Mg²⁶   =    x      

Mg²⁴   =   100- 10 - x = 90 -x    

Formula:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass)  / 100

24.985 = (0.1×24.986)+(90-x×23.985) + ( x ×25.983 )  /100

24.985 =  249.86 + 2158.65 - 23.985x + 25.983x  / 100

24.985 = 2408.51 + 1.998 x / 100

2498.5 = 2408.51 + 1.998 x

1.998 x = 2498.5 - 2408.51

1.998 x = 89.99

x = 89.99 /1.998

x = 45.04

Now we put the value of x:

Mg²⁵   =   10.00    

Mg²⁶   =    x  (45.04)

Mg²⁴   =   90 -x   (90 - 45.04 = 44.96)

You might be interested in
Can someone help me with this question?
Softa [21]

Answer:

5 , I think. sorry if its wrong

8 0
3 years ago
Which of the following elements would form the smallest ionic radius and why?
AnnyKZ [126]

Answer:

Sodium

Explanation:

5 0
3 years ago
Riley is doing an experiment working with friction. He wants to find two ways to modify an object that could increase or decreas
Shtirlitz [24]
Riley can either change the surface area of the object or can change the slipperiness of the material.
5 0
3 years ago
Read 2 more answers
Drinking water may contain a low concentration of lead ion (Pb2 ) due to corrosion of old lead pipes. The EPA has determined tha
Lynna [10]

Answer:

3.861x10⁻⁹ mol Pb⁺²

Explanation:

We can <u>define ppm as mg of Pb²⁺ per liter of water</u>.

We<u> calculate the mass of lead ion in 100 mL of water</u>:

  • 100.0 mL ⇒ 100.0 / 1000 = 0.100 L
  • 0.100 L * 0.0080 ppm = 8x10⁻⁴ mg Pb⁺²

Now we <u>convert mass of lead to moles</u>, using its molar mass:

  • 8x10⁻⁴ mg ⇒ 8x10⁻⁴ / 1000 = 8x10⁻⁷ g
  • 8x10⁻⁷ g Pb²⁺ ÷ 207.2 g/mol = 3.861x10⁻⁹ mol Pb⁺²
4 0
3 years ago
When the following equation is balanced, what is the coefficient of oxygen?
Gwar [14]

Answer:

The answer is 3

C2H5OH + O2 CO2 +H2O (unbalanced)

C2H5OH +3O2(g). 2CO2(g)+3H2O(balanced)

4 0
3 years ago
Other questions:
  • 86.1 g of nitrogen reacts with lithium, how many grams of lithium will react?
    13·1 answer
  • Create your own Model of an Atom. You may choose any element you would like to be represented by your model of an atom. Then pho
    14·1 answer
  • How can the partial charges be shown in a polar covalent molecule?
    5·1 answer
  • Which term describes this reaction? addition condensation elimination substitution
    8·1 answer
  • How many electrons does an aluminum ion have?<br> a. 10<br> b. 13<br> c. 14<br> d. 16
    12·2 answers
  • The rainforest contains what percentage of all of the species in the world?
    13·2 answers
  • Identify the relationship between &lt;2 and &lt;4*
    11·1 answer
  • Apply your knowledge of atomic theory to determine The number of protons contained in a neutral Adam of palladium that has 46 el
    10·1 answer
  • 1010L
    6·1 answer
  • What is the limiting reagent when 9.517 g of Fe is allowed to react with 19.34 g of water according to
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!