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gayaneshka [121]
3 years ago
7

Refer to the following elements to answer the questions below. 126C168O11H147N3216S3115P, where the upper index is atomic mass a

nd the lower index is atomic number. How many electrons will a single atom of sulfur with no charge and no bonds have in its valence shell?
Chemistry
1 answer:
hjlf3 years ago
3 0

<u>Answer:</u> The number of valence electrons in sulfur atom are 6.

<u>Explanation:</u>

The isotopic representation of sulfur atom is _{16}^{32}\textrm{S}

Valence electrons are defined as the electrons that are present in the outer most orbital of an atom. Electrons present in the orbitals having highest principle quantum number are termed as valence electrons.

Sulfur is the 16th element of the periodic table having 16 electrons.

Electronic configuration of sulfur atom is 1s^22s^22p^63s^23p^4

The number of valence electrons present in sulfur atom are 2 + 4 = 6

Hence, the number of valence electrons in sulfur atom are 6.

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What is the empirical formula of C20H40
Nat2105 [25]

Answer:

CH2

Explanation:

The empirical formula gives the lowest whole number ratio of the elements. In this case, both subscripts can be divided by 20, hence CH2.

8 0
3 years ago
In this reaction, the chromium is reduced, from Cr6+ to Cr3+, causing a color change in the solution, signaling the endpoint. De
Travka [436]

Answer:

Using the information provided in the question, the percentage by mass of ethanol in the blood is 0.1949%.

Explanation:

The balanced equation for the reaction can be written as:

3CH3CH2OH + 2K2Cr2O7+ 16H+ >>>> 3CH3COOH + 4Cr3+ + 4K+ + 11H2O. This will be used to solve the problem.

The no of moles of K2Cr2O7 used = concentration X volume in dm cube.

= 0.05 X 22.6/1000 = 1.13/1000 = 0.00113 moles of K2Cr2O7 was used.

From the balanced equation above, 3 moles of ethanol will react with 2 moles of K2Cr2O7.

Therefore, 0.00113 X 3/2 moles of ethanol would have been in the blood of the subject = 0.001695 moles of ethanol.

Remember that no of moles = mass/molar mass. Then mass = moles X molar mass.

The molar mass of ethanol is 46g/mole.

Then mass = 0.001695 X 46 = 0.07797gram of Ethanol was in the blood.

Percentage by mass in blood is: 0.07797/40 X 100 = 0.1949%

8 0
3 years ago
How are the orbits of asteroids similar to, or different from planetary orbits?
Strike441 [17]
Aside from banks, what are 2 other places you might be able to borrow
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7 0
3 years ago
NaCl express your answer as an Ion <br> Does anyone know what the answer for this would be
alex41 [277]

Answer:

iconic compound

Explanation:

6 0
2 years ago
How many moles of ions are released when 0.27 mole of cobalt chloride is dissolved in water?
egoroff_w [7]

0.81 moles

Explanation:

cobalt chloride when dissolved in water dissociate into cobalt and chloride ions as shown;

CoCl₂ (s) → [Co²⁺](aq) + 2[Cl⁻] (aq)

The mole ratio between CoCl₂ and [Co²⁺] is 1 ; 1 while the mole ratio between CoCl₂ and [Cl⁻] is 1 : 2

Therefore; 0.27 moles of CoCl₂ will form;

(1 * 0.27) = 0.27 moles of [Co²⁺] ions

(2 * 0.27) = 0.54 moles of [Cl⁻] ions

Total moles of dissociated ions are;

0.27 + 0.54

= 0.81 moles

4 0
3 years ago
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