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Ainat [17]
3 years ago
10

How can the periodic table be used to infer the number of valence electrons in an atom?

Chemistry
1 answer:
Radda [10]3 years ago
8 0
Beside each element on the right upper side is the number of electrons in each energy level starting from the first energy level to the last going in order from top to bottom, the number of valence electrons would be the last one.
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Please help me!!!!!!!!!!!!!
fenix001 [56]

1)The limiting reactant will be aluminum acetate

2) The mass of aluminum hydroxide formed will be 9.75 grams.

<h3>Stoichiometric problem</h3>

The equation of the reaction is as below:

Al(C_2H_3O_2)_3 + 3NaOH --- > 3C_2H_3NaO_2 + Al(OH)_3

The mole ratio of the 2 reactants is 1:3.

Mole of 100 mL. 1.25 mol/L Al(C_2H_3O_2)_3 = 0.1 x 1.25 = 0.125 mol

Mole of 300 mL, 2.30 mol/L NaOH = 0.3 x 2.3 = 0.69 mol

Thus, aluminum acetate is limited.

Mole ratio of  Al(C_2H_3O_2)_3 and Al(OH)_3 = 1:1

Equivalent mole of Al(OH)_3 = 0.125 mol

Mass of 0.125 mole Al(OH)_3 = 0.125 x 78 = 9.75 grams.

More on stoichiometric calculations can be found here: brainly.com/question/27287858

#SPJ1

4 0
2 years ago
Need help with 6th grade science homework PLZ HELP ASAP
Tom [10]

Answer:

whaa is it

Explanation:

3 0
2 years ago
Read 2 more answers
Name five solvents available to the organic chemistry for use in the purification of organic compounds.
DiKsa [7]

Explanation:

The solvent is a base or medium , in which reaction takes place ,

Mostly organic solvents have hydrogen and carbon , and is purposely used to dissolve the organic sample .

The example of organic solvents , used in laboratory are as follows -

 

1. Toluene

2. Hexane

3. Pentane

4. Benzene

5. Methanol

5 0
3 years ago
Please help me!!!!!!
Natalka [10]
I think it should be 2.358
7 0
3 years ago
Express 0.0000046 in scientific<br> notation.<br> [?]x10
aivan3 [116]

Answer:

4.6 x 10⁻⁶

Explanation:

In scientific notation, the number should be written in between 1 - 10 and multiplied by 10 raised to a power.

In this case, the decimal place should be placed in-between the 4 and the 6. To do this, you must move the decimal place 6 digits to the right. When you move the decimal place to the right, the 10 should be raised to a negative number.

As such, 0.0000046 in scientific notation is 4.6 x 10⁻⁶.

3 0
2 years ago
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