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skelet666 [1.2K]
3 years ago
13

How many valence electrons does beryllium have

Chemistry
1 answer:
svlad2 [7]3 years ago
8 0

Beryllium has 4 electrons.

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Problem PageQuestion Iron(III) oxide and hydrogen react to form iron and water, like this: (s)(g)(s)(g) At a certain temperature
Marrrta [24]

Complete question

The complete question is shown on the first uploaded image

Answer:

The value is  K_c  =  2.69 *10^{-5}  

Explanation:

From the question we are told that

   The equation is  

           Fe_20_3_{(s)}+3H_{(g)}\to2Fe_{(s)}+3H_2O_{(g)}

Generally the equilibrium is mathematically represented as

        K_c  =  \frac{[H_2O]^2}{[H_2]^3}

Here [H_2O] is the concentration of water vapor which is mathematically represented as

      [H_2O ] =  \frac{n_w}{V_s }

Here V_s is the volume of the solution given as 8.9 L

n_w is the number of moles of water vapor which is mathematically represented as

        n_w  =  \frac{m_w}{Z_w}

Here  m_w  is the mass of water given as 2.00 g

and   Z_w  is the molar mass of water with value  18 g/mol

So  

         n_w  =  \frac{2}{18}

=>     n_w  = 0.11 \  mol

So

     [H_2O ] =  \frac{0.11}{8.9 }

=>   [H_2O ] = 0.01236 \  M

Also

[H] is the concentration of hydrogen gas which is mathematically represented as

      [H ] =  \frac{n_v}{V_s }

Here V_s is the volume of the solution given as 8.9 L

n_v is the number of moles of  hydrogen gas which is mathematically represented as

        n_v  =  \frac{m_v}{Z_v}

Here  m_w  is the mass of water given as 4.77 g

and   Z_v  is the molar mass of water with value  2 g/mol

So  

         n_w  =  \frac{4.77}{2}

=>     n_w  = 2.385 \  mol

So

     [H_2O ] =  \frac{2.385}{8.9 }

=>   [H_2O ] =  0.265 \  M

So

     K_c  =  \frac{( 0.01236 )^3}{ (0.265 )^2}

=>   K_c  =  2.69 *10^{-5}  

7 0
3 years ago
PLEASE HELP!
Mice21 [21]

Answer:

The Axis Powers took these aggressive actions prior to the outbreak of World War II which include the invasion of Ethiopia, Manchuria, and the Rhineland.

Explanation:

Axis Powers: It was the coalition of Germany, Italy and Japan against the <em>Allied Powers</em> (the United States, the Soviet Union, Great Britain, and China) in World War II.

  1. In 1930, the Japanese took control of railway track in Manchuria (a region in China) and in  1931, the Japan attacked the Chinese army claiming that the Chinese soldiers sabotaged the railway.
  2. On 3 October 1935, Italy invaded the Ethiopia (former name: Abyssinia) in the leadership of <em>Mussolini </em>to expand its territories.
  3. Germany in the leadership of Adolf Hitler occupied the Rhineland in 1937 by making excuse that the area is hostile and dangerous for them.  

5 0
3 years ago
1.014)
Viefleur [7K]
The answer is B.Laws
7 0
3 years ago
As atoms get smaller,valance electrons are getting closer or farther away from the nucleous.The force of attraction is stronger
LiRa [457]

Explanation:

Electrons are closer to the nucleus are in filled orbitals and are called core electrons. More energy which in nucleus called nuclear strOng energy to remove electron thars why its also a way harder too..

3 0
3 years ago
Which of the following is NOT a variable property for a gas?
Alex_Xolod [135]
Mass, air has that. Since what fills up a balloon? A gas
Shape, it has no definite shape. This one is accurate, it has no definite shape, it takes the shape of the object it's in.
Volume, does air take up space? If it does then yep. Balloon example/
Density, yes it does, because it's tightly wounded up.

D
5 0
4 years ago
Read 2 more answers
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