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pychu [463]
3 years ago
14

To draw a Lewis structure, first add the number of outer (valence) electrons contributed by each atom to obtain the total number

of outer electrons. What is this value for a molecule of H2CCH2?
Chemistry
1 answer:
Alex777 [14]3 years ago
4 0

Answer:

12 is the total number of outer electrons  for a molecule of H_2C=CH_2

Explanation:

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

Valence electron of carbon = 4

Valence electron of hydrogen = 1

Number of carbon atoms in H_2C=CH_2 = 2

Number of hydrogen atoms in H_2C=CH_2 = 4

Total number of valence electrons :

2\times 4+4\times 1 =12

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A 35.0 mL sample of 1.00 M KBr and a 60.0 mL sample of 0.600 M KBr are mixed. The solution is then heated to evaporate water unt
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Answer: The molarity of KBr in the final solution is 1.42M

Explanation:

We can calculate the molarity of the KBr in the final solution by dividing the total number of moles of KBr in the solution by the final volume of the solution.

We will first calculate the number of moles of KBr in the individual sample before mixing together

In the first sample:

Volume (V) = 35.0 mL

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Number of moles (n) = C × V

n = (35.0mL × 1.00M)

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For the second sample

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C= 71.0mmol/50mL

C = 1.42M

Therefore, the molarity of KBr in the final solution is 1.42M

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The correct answer for the question that is being presented above is this one: 

Given that:
delta Tb = Kbm Kb H2O = 0.52 degrees C/m 
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</span>
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<span>We are given the amount of solute in grams
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<span>Then, use the formula for molality. </span>

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