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gogolik [260]
3 years ago
15

The elements in valence group 5 have how many valence electrons?​

Chemistry
1 answer:
Viefleur [7K]3 years ago
6 0

Answer:

5 valence electron

Explanation:

It is because the group number is equal to the valence electron.

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2KCIO3 -2KCL + 302
Firlakuza [10]

Answer:

a. 6 moles of O₂

b. 4.06×10²⁴ molecules of O₂

c. 3.04 g of KCl

Explanation:

Reaction of decomposition is:

2KClO₃  →  2KCl  +  3O₂

a. See stoichiometry value

2 moles of potassium chlorate can decompose to 2 moles of potassium chloride and 3 moles of oxygen. Ratio is 2:3

If 2 moles of KClO₃ can decompose to 3 moles of O₂

Then 4 moles, may decompose to (4 . 3)/2 = 6 moles of O₂

b. In this case, the stoichiometry is the same.

Per 2 moles of KClO₃, I produce 2 moles of KCl

Then, 4.5 moles of KCl, were produced by 4.5 moles of KClO₃

We apply, the last relation:

(4.5 . 3) /2 = 6.75 moles of O₂ are also produced.

How many molecules are in 6.75 moles?

6.75 mol . 6.02×10²³ molecules/mol = 4.06×10²⁴ molecules of O₂

c. First of all, we convert the mass to moles:

5g . 1mol /122.55g = 0.0408 moles of salt

As ratio is 2:2, 0.0408 moles of salt, decompose to 0.0408 moles of KCl

We convert the moles to mass: 0.0408 mol . 74.55g /mol = 3.04g

5 0
2 years ago
1
Musya8 [376]

Answer:

A perfect mold of a dinosaur bone

3 0
3 years ago
Read 2 more answers
How many moles of glucose are contained in 8.3 x 10^21 molecules of glucose
Lelu [443]
Approximitly 0.013787375 moles 
4 0
3 years ago
Read 2 more answers
__________ are the most organized state of matter.
Nataly_w [17]
I believe the answer is solid

Because solid molecules are the most uniform and tight put together molecules

Hope this helps ;)
3 0
3 years ago
Read 2 more answers
A Metal mass of 71.68g occupies a volume of 8cm^3. Calculate the density
Damm [24]
Density = mass
                --------------
                 volume
 
             =        71.68
                    -------------
                          8
 
              =         8.96 g/cm3.

Hope this helps!

5 0
3 years ago
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