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
kumpel [21]
3 years ago
15

In order to jave 2.2 moles of potassium oxide, how many grams of potassium are needed

Chemistry
1 answer:
DanielleElmas [232]3 years ago
8 0
Answer is: mass of potassium is 172.04 grams
Balanced chemical reaction: 4K + O2 = 2K2O.
n(K2O) = 2.2 mol.
From chemical reaction: n(K2O) : n(K) = 2 : 4 ( 1 : 2).
n(K) = 4.4 mol.
m(K) = n(K) • M(K).
n(K) = 4.4 mol • 39.1 g/mol.
n(K) = 172.04 g.
n - amount of substance.
m - mass of substance.
M - molar mass.
You might be interested in
Which of the following procedures is used during the fractional distillation of petroleum?
dem82 [27]
Increase at the temperature
7 0
3 years ago
If the pH of a solution is 5.4 then the concentration of H+ ions is ___|_x10^-6
Svetllana [295]
H is 4*10^6 M , OH is 2.5*10^-9 M
6 0
3 years ago
Lead (II)oxide+calcium metal=​
AfilCa [17]
I didn’t understand
3 0
3 years ago
The diagram above shows the atomic emission line spectrum of hydrogen. The wavelength of each line is shown at the top of the li
Anni [7]
Hello there,

Your correct answer would be "<span>the energy of a photon".

Hope this helps.

~Hottwizzlers


</span>
6 0
3 years ago
Read 2 more answers
How do I do question number 3? And what is the answer?
shutvik [7]

Answer:

60.02 g.

Explanation:

  • It is clear from the balanced equation:

<em>Mg + 2HCl → MgCl₂ + H₂. </em>

that 1.0  mole of Mg reacts with 2.0 moles of HCl to produce 1.0 mole of MgCl₂ and 1.0 moles of H₂.

  • 20.0 g of Mg reacts with excess HCl. To calculate the no. of grams of HCl that reacted, we should calculate the no. of moles of Mg:

<em>no. of moles of Mg = mass/atomic mass</em> = (20.0 g)/(24.3 g/mol) = 0.823 mol.

  • From the balanced equation; every 1.0 mol of Mg reacts with 2 moles of HCl.

∴ 0.833 mol of Mg will react with (2 x 0.833 mol = 1.646 mol) of HCl.

<em>∴ The mass of reacted HCl = no. of moles x molar mass</em> = (1.646 mol)(36.46 g/mol) = <em>60.02 g.</em>

3 0
3 years ago
Other questions:
  • Is filling up beakers with 200ml of water bad
    9·1 answer
  • He total power used by humans worldwide is approximately 15 TW (terawatts). Sunlight striking Earth provides 1.336 kW per square
    13·1 answer
  • WILL MARK BRAINLIEST
    15·1 answer
  • Help with this question
    6·2 answers
  • How do you convert ethane to ethanoic acid? Please provide your equation.
    13·1 answer
  • Which has more atoms: 1 mole of hydrogen atoms or 1 mole of carbon-12 atoms?
    6·1 answer
  • How many electrons does strontium give up to achieve a noble-gas configuration?
    6·1 answer
  • Can you get molecules to stop wiggling??
    5·1 answer
  • A mole of oxygen and a mole of hydrogen (at STP) have all of the following in common EXCEPT
    9·1 answer
  • Natural gas (CH4) has a molar mass of 16.0 g/mole. You started out the day with a tank containing 200.0 g of natural gas. At the
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!