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
sdas [7]
3 years ago
15

How many atoms are in a sample of 72.8 g calcium (Ca)?

Chemistry
2 answers:
Aneli [31]3 years ago
8 0
Atomic mass Ca=40.078 a.m.u

40.078 g--------------------6.02x10²³  atoms
72.8 g ---------------------- ??

72.8 x (6.02x10²³ ) / 40.078 =

4.38x10²⁵ / 40.078 = 1.093x10²⁴ atoms


HOPE THIS HELPED :D
xxMikexx [17]3 years ago
5 0
Atomic mass Ca = 40.078 a.m.u

40.078 g -------------------- 6.02x10²³ atoms
72.8 g ---------------------- ??

72.8 x ( 6.02x10²³) / 40.078 =

4.38x10²⁵ / 40.078 = 1.093x10²⁴ atoms

hope this helps!
You might be interested in
Write a balanced chemical equation for the reaction between ammonium
Natasha2012 [34]

Answer:

 (NH₄)₃PO₄ (l) + Al(NO₃)₃(l) -----------→  AlPO₄(l) + 3NH₄NO₃(l)

Explanation:

Data Give:

Reaction between ammonium phosphate solution and solution of aluminum nitrate

  • Write a balanced chemical equation
  • include phase symbols

Details:

To write a balanced chemical equation we have to know formula units of compounds or molecules

Formula units

ammonium phosphate : (NH₄)₃PO₄

aluminum nitrate: Al(NO₃)₃

ammonium nitrate: NH₄NO₃

Now to write a chemical equation

  • we have to write the chemical formulas  or formula unit of each compound
  • write the reactant on left side of the arrow
  • write the product on the right side of the arrow
  • put a plus sign in 2 reactants and products on each side of the arrow
  • balance the equation by putting coefficient with compound formula
  • write the phase symbols on the right corner of the compound formula in brackets

So the Reaction will be

                      (NH₄)₃PO₄ + Al(NO₃)₃ -----------→  AlPO₄ + NH₄NO₃

Now balance the Chemical equation

                     (NH₄)₃PO₄ + Al(NO₃)₃ -----------→  AlPO₄ + 3NH₄NO₃

Now write the phase Symbols

                     (NH₄)₃PO₄ (l) + Al(NO₃)₃(l) -----------→  AlPO₄(l) + 3NH₄NO₃(l)

all compounds in the reaction are in liquid form and soluble in water

*** Note:

There is no aluminum nitrite in chemicals formulas

Also ammonium nitrite can not be used in pure isolated form due to its highly instability

4 0
3 years ago
If scientists want to determine if a skin cream is effective against fighting acne, what would be the independent variable?
lina2011 [118]

Answer:skin cream

Explanation:

the independent variable is the variable that is always changed or manipulated. in this case the skin cream is the independent variable.

6 0
3 years ago
Formula for Hydrocloric Acid.
Elden [556K]
HCl is the formula for hydrocloric acid
6 0
3 years ago
Explain what the ecliptic is
AlekseyPX
The Ecliptic is an imaginary line on the sky that marks the annual path of the sun. It is the projection of Earths orbit onto the celestial sphere. The ecliptic is even the starting point for the celestial coordinate system used by astronomers to pinpoint the location of every star, nebula, and galaxy.
7 0
3 years ago
What happens to sodium chloride when it dissolves in water
lara31 [8.8K]

<>"On addition to water the Na+ section of NaCl is attracted to the oxygen side of the water molecules, while the Cl- side is attracted to the hydrogens' side of the water molecule. This causes the sodium chloride to split in water, and the NaCl dissolves into separate Na+ and Cl- atoms."<>

4 0
3 years ago
Read 2 more answers
Other questions:
  • An aqueous HCL solution has a proton concentration equal to 6.00 mol/L. The HCL concentration in this solution is ————M.
    8·1 answer
  • Explain in molecular terms what would have to be done to a plant oil to transform it to a trans fat.
    8·1 answer
  • Two ways that salinity can increase
    7·1 answer
  • What would be a correct unit of measurement for velocity?
    5·2 answers
  • How many grams of sodium are in<br> 1.000 mole of sodium?
    13·2 answers
  • Write a nuclear equation for the hypothetical fusion of a copper atom with another nucleus to make gold. Can this happen? Why or
    11·1 answer
  • wright it in 500 words Submit your persuasive essay about nuclear power. Remember to proofread your work before submitting.
    9·1 answer
  • .) What happens when Carbon dioxide gas is Collected down ward of water ? ​
    10·1 answer
  • How many atoms are there in 0.028 grams<br> of iron metal?<br> 12:50 ✓
    5·1 answer
  • A solution of potassium nitrate is made when potassium nitrate dissolves in water.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!