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
Anit [1.1K]
2 years ago
5

Can somebody help? Do not answer if you don't know.

Chemistry
1 answer:
blondinia [14]2 years ago
5 0

Answer:

10.8amu

Explanation:

Given parameters:

Abundance of B - 10  = 20% = 0.2

Abundance of B - 11  = 80% = 0.8

Unknown:

Atomic mass of Boron = ?

Solution:

The atomic mass of Boron can be can be calculated using the expression below;

 Atomic mass  = (abundance of B - 10 x mass of isotope B - 10 ) +( abundance of  B - 11 x mass of isotope B- 11)

 Atomic mass  = (0.2 x 10) + (0.8 x 11) = 2 + 8.8  = 10.8amu

You might be interested in
What are some physical properties that could have helped to identify a mystery powder?
Rus_ich [418]

i dont really know i will find some more information on that in about 5 minutes

6 0
3 years ago
Aqueous humor forms during capillary filtration in the __________?
Karolina [17]

Answer:

Ciliary body.

Explanation:

Ciliary body: It is the known for the part of the eye that includes the ciliary muscle, which helps in the control the ciliary epithelium and lens shape, which are helping in the production of aqueous humor.

Through active secretion mechanism helping in to produce eighty percent of aqueous humor, and through the plasma ultra-filtration mechanism twenty percent of aqueous humor is produced.

Ciliary body is the part of the layer which helps to deliver the nutrients, and oxygen to the eye tissues, and this layer is known as uvea.

7 0
3 years ago
4. The woman's auxiliary at the Fire Company need to make 250 one pound pie crusts for a fund raiser. If
Andre45 [30]

Answer:

i rly did this for the extra points sry btw its d tho

Explanation:

7 0
2 years ago
There are several aromatic compounds with the formula C8H9Cl. Draw those that have a trisubstituted ring where the methyl groups
Kryger [21]

Answer:

3-Chloro-1,2-dimethylbenzene

4-Chloro-1,2-dimethylbenzene

Explanation:

Such types of compounds in which conjugated planer ring system and delocalized pi electrons are present are called aromatic compounds such as Toluene, Benzene and some other. Generally, these compounds follow Huckle's rule. The trisubstituted ring means a compound in which three hydrogen atoms are replaced by three other groups. In the given compound  two hydrogen atoms are replaced by two methyl groups and one hydrogen atom is replaced by one Chlorine atom. From the given compound  3-Chloro-1,2-dimethylbenzene, and   4-Chloro-1,2-dimethylbenzene  can be drawn.

7 0
3 years ago
What is the mass of 6.78x1050 molecules of NaCl
ryzh [129]

Answer:

Explanation:

As

Molar mass of NaCl= 58.44 gm

So we got it that,

58.44 mass of NaCl contain = 6.023*10^23  molecules of Na Cl

x mass will contain = 6.78*10^50

by cross multiplication , we get

x=  58.44*(6.78*10^50)/  6.023*10^23  

x= 65.785 * 10^27  molecules

Plz Brain-list\support me by Subscribing my channel "ZK SOFT&GAMING"

6 0
2 years ago
Other questions:
  • What is the concentration of your solution?
    14·1 answer
  • A gas sample of Xe occupies 10-liter balloon at 27 degrees C under a pressure of 1.2 atm. Approximately what volume would the ga
    8·2 answers
  • Why does sulfur have more than 8 electrons in its valence?
    11·1 answer
  • All the elements of a family in the periodic table have what feature in common? A) They all have similar chemical properties. B)
    7·2 answers
  • What is the difference between a universal law and a scientific theory?
    11·1 answer
  • Which is it , if you are right I will give brainliest
    9·2 answers
  • What did the walking treaty of 1737 do?
    6·1 answer
  • In an isotope, which subatomic particle varies in number ?
    11·1 answer
  • Consider the model of the nitrogen atom.
    9·2 answers
  • 1)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!