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
marysya [2.9K]
3 years ago
6

How many atoms of ca are present in 8.6 mg? the atomic weight of ca is 40.08 amu?

Chemistry
1 answer:
Elina [12.6K]3 years ago
8 0
One mole of any element is Avogadro's number, which is 6.02 * 10^23 atoms. One mole of Calcium is equal to its atomic weight in grams, 1 mole Ca = 40.08 x 1000 mg = 6.02 * 10^23 atoms. We have 8.6mg of Ca which means 8.6mg / 40,080mg = .00021457 of a mole of calcium. Now multiply that by Avogadro's number which gives number of atoms = 0.00021457 * 6.02 * 10^23 atoms. So the answer is 1.292 * 10^20 atoms of Ca.
You might be interested in
Two masses exerting a force on each other is an example of What????
trasher [3.6K]

Newtons universal law of gravitation

hope this helps

8 0
3 years ago
How does the oceanic crust compare to continental crust?
dimulka [17.4K]

I think the answer is number (4)

5 0
3 years ago
Which statements are true about Figure I and Figure II below? (Check all that apply)
Scilla [17]

Both figures are mixtures,

Figure II is a heterogenous mixture

Figure I is a homogenous mixture

5 0
3 years ago
Describe the relationship between temperature and kinetic energy.
RSB [31]
Temperature is a measure of the average kinetic energy of the particles in an object.
7 0
4 years ago
Differences between mixtures and elements
EastWind [94]

Mixtures are a group of elements that are mixed together but not chemically combined

Elements are the fundamental materials of which all matter is composed.

Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together

5 0
3 years ago
Other questions:
  • In general, ionization energy will
    12·2 answers
  • Which best describes thermal energy? It is the difference between internal energies of two or more substances. It is the sum of
    9·1 answer
  • According to the molecular orbital (mo) treatment of the no molecule, what are the bond order and the number of unpaired electro
    10·1 answer
  • What is a niche of a greenfly?
    7·1 answer
  • How many electrons does oxygen have in its outer shell?
    10·1 answer
  • Which elements are designated as the alkaline-
    11·1 answer
  • 5 moles of a monatomic gas has its pressure increased from 105 Pa to 1.5*105 Pa. This process occurs at a constant volume of 0.1
    7·1 answer
  • What are the coefficients that would balance the chemical equation below?
    10·1 answer
  • 9.7300x10^2 + 9.8700x10^3 <br><br> ? × 10^?
    13·1 answer
  • How are different elements distinguishable from one another? (Check all that apply.)
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!