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
nexus9112 [7]
3 years ago
15

Calculate the number of atoms in 3mol helium

Chemistry
1 answer:
OleMash [197]3 years ago
7 0
 <span>The chemical formula of Helium is He. 

Question 1 : 

Given n = 1.11 x 10^-6 

To get no. of the particle, 
No of particle = no. of mole x Avogadro Constant 
p = n x NA 

1 mol of Helium = 6.02 x 10^23 

No of atoms = (6.02 x 10^23) x (1.11 x 10^-6) 
= 6.66 x 10^17 

................................ 

Question 2 : 

Given p = 4.29x10^21 

p = n x NA 
4.29 x 10^21 = n x (6.02 x 10^23) 
(4.29 x 10^21) / (6.02 x 10^23) = n 
n = Approximately 7.126 x 10^-3 

Hope the answer is right :)</span>
You might be interested in
Balance the chemical equation.Au plus HC l plus HNO 3 right arrow AuC l Subscript 3 Baseline plus NO plus Upper H 2 Upper OAu+HC
tino4ka555 [31]

Answer:

Au+ 3HCl + HNO_3 \to AuCl_3+NO+2H_2O

Explanation:

Chemical Equations are representations of chemical reactions in terms of the symbols and formulae of the elements and compounds involved. A chemical equation usually have the reactant at the left hand side while the product is on the right hand side.

A chemical Equation is of little or no value if is not in balanced equation. When an equation is balanced , the total number of atoms of any element on the left-hand side of it must be equal to the total number of atoms of that element on the right hand side.

in the given question; we are given a word problem of chemical symbol to  compute and also to balance the chemical equation.

From below; the chemical equation can be written as:

Au+ HCl + HNO_3 \to AuCl_3+NO+2H_2O

From the above  equation we will notice  that  it is not truly balanced ; so th balanced equation can be written as:

Au+ 3HCl + HNO_3 \to AuCl_3+NO+2H_2O

5 0
3 years ago
Help me please!
Vlad1618 [11]

Answer:

  • C. 108 grams/100g of H2O

Required number is the vertical coordinate of the intersection point of a line at 60°C with the graph of the KNO₃.

8 0
2 years ago
Read 2 more answers
Relate dark matter to the development of the universe after the Big Bang. In 3-5 sentences, speculate on how the development of
Alenkinab [10]

Answer:

Dark matter makes up 85% of the mass of the universe. Dark matter is not directly observable because it doesn't interact with any electromagnetic wave. In the development of the universe, without dark matter, the universe will not function, move or rotate as it does now (this speculation led to the quest to find the anomaly of mass and energy in the known universe, eventually leading to the idealization of dark matter) and will not have enough gravitational force to hold it together.  After the big bang,<em> the presence of dark matter and energy ensured that the newly formed universe didn't just float away, rather, it provided enough gravitational force to hold the universe while still allowing it to expand sufficiently</em>.

The development of the universe would have been different without the universe in the sense that the young universe won't have enough mass to hold it together, and the universe would have simply floated apart. The behavior of the universe would have been different from what we observe now, and some physical laws that applies now will not apply to the universe.

6 0
3 years ago
Howtocalculatethevolumeofcarbondioxideproducedwhen400gofmarblewereats.t.p<br>​
lys-0071 [83]

Answer:

so 0.15 moles X 22.4 dm3/mole=3.36 dm3. Next we find the moles of hexane combusted, and then the moles of CO2. Finally, we find the volume of CO2 using the fact that at STP, 1 mole of gas = 22.4 dm3.

3 0
3 years ago
What is the correct name for the compound CaSO4•2H2O?
zlopas [31]
CaSO4.2H2O is a white crystal at room temperature. It is soluble in water. Gypsum can be used as a fertilizer.


This Might Be The Answer Idk?
5 0
3 years ago
Other questions:
  • If any more mix is added, it will not dissolve. the solution is
    12·1 answer
  • When Mendeleev organized the elements by their _________, he noticed the properties of elements repeated.
    13·1 answer
  • Below are the steps of the engineering process (not necessarily in order): 1) Know the background 2) Do the work 3) Make a plan
    12·1 answer
  • What is an amu..........?
    12·1 answer
  • How many atoms are in 4.90 mol of Al2O3
    14·1 answer
  • In a polar bond, ____<br> are not shared equally between atoms.
    8·2 answers
  • What would be the correct answer please help!
    13·2 answers
  • How much space do 2x10 22 copper pennies take up
    15·1 answer
  • Need ASAP will give brainlist
    12·1 answer
  • The tendency of an atom to pull electrons toward itself is referred to as its _____. ionic potential tonicity covalency electron
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!