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ikadub [295]
3 years ago
10

4Na + O2 --> 2Na20 If 4 moles of Na react completely, how many moles of Na2O form?

Chemistry
2 answers:
Olegator [25]3 years ago
8 0

Answer:

Rebecca, as I used to tell my chemistry students, the key to ANY stoichiometry problem is to first write the balanced equation. Even if you think you can solve the problem in your head. In your question, you know your two reactants and you know your product. Your question itself provides the unbalanced equation:

H2 + O2 → H2O

But the oxygen atoms come in packages of two. Currently the there are two oxygen atoms on the left and only one on the right. Let’s fix that:

H2 + O2 → 2 H2O

So we have the same number of oxygen atoms left and right, but now there are not enough hydrogen atoms on the left. Let’s fix that as well:

2 H2 + O2 → 2 H2O

Our equation is balanced! As sometimes happens, the answer to the question is staring us in the face. Two hydrogen molecules would give us two molecules of water. Two dozen hydrogen molecules would give us two dozen molecules of water. A mole is a number like a dozen only much bigger. Two moles of hydrogen molecules will give us two moles of water molecules.

Explanation:

hope this helps

Sati [7]3 years ago
5 0
2 moles of Na2O are produced.

4 moles of Na react with 1 mole of O.
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Answer:

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5 0
3 years ago
The lewis dot notation for two atoms is shown. What is represented by this notation? K loses one portion to CI, K gains one port
telo118 [61]

Answer:

K loses one electron to CI

Explanation:

The lewis electron dot notation shows only the chemical symbol of the element surrounded by dots to represent the valence electrons.

  We have atom of K with one valence electrons

   Cl with 7 valence electrons

For an electrostatic attraction to occur, both particles must be charged. To do this, one of the species must lose an electron, and the other gains it.

This will make both species attain a stable octet;

   Hence, K will lose 1 electron and Cl will gain the electrons.

6 0
3 years ago
Assuming an ionization efficiency of 13.0%, how many such photons are needed to ionize 1.00×1016 atoms?
sammy [17]

Answer:

7.69x10^{16}

Explanation:

The ionization is the energy necessary to transform an atom in an anion. So, it's the energy it requires to gain an electron.

This ionization occurs for the photoelectric effect - the emission of electrons by  metal using photons. So, if the efficiency is 100%, 1 photon can ionize 1 atom, but for an effficiency of 13.0%:

N = \frac{1.00x10^{16}}{0.13}

N = 7.69x10^{16}

Where N is the number of photons.

6 0
3 years ago
Will these changes increase, decrease, or have no effect on the mean free path of the molecules in a gas sample?
lisabon 2012 [21]
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l = μ/P * √(πkT/2m), where
l is the mean free path
μ is the viscosity of the fluid
P is the pressure
k is the Boltzmann's constant
T is the absolute temperature
m is the molar mass

So, here are the general effects of the factors on the mean free path:

Mean free path increases when:
1. The fluid is viscous (↑μ)
2. At low pressures (↓P)
3. At high temperatures (↑T)
4. Very light masses (↓m)

The opposite is also true for when the mean free path decreases. Factors that are not found here have little or no effect.
6 0
4 years ago
Which molecule has a high specific heat?<br><br> a) C2H6<br> b) C2H6O<br> c) H2O
dem82 [27]
H2O is the correct answer :)
4 0
3 years ago
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