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3 years ago

How many valence electrons are present in this atom?

Chemistry

1 answer:

Drupady [299]3 years ago

5 0

Answer:

This atom has 1 valence electron

Explanation:

Step 1: Data given

The ionization energy for the following element is:

I 496

II 4562

III 6912

IV 9544

V 13353

The element that has this ionization energy is sodium (Na)

Sodium has 11 electrons:

2 electrons on the first shell

8 electrons on the second shell

1 electron on the outer shell = 1 valence electron

This atom has 1 valence electron

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What is 108 g +10+5+3

natali 33 [55]

ANSWER : 108 + 10 = 118

118 + ( 5 + 3 )

118 + 8 = 126

= 126 g

7 0

3 years ago

7. How many liters of NH3, at STP, will react with 5.3 g 02 to form NO2 and water? (1 point)

motikmotik

Answer:

2.12 L

Explanation:

Data Given:

Amount of O₂ = 5.3 g

Amount of NH₃ = ?

Given Reaction:

4NH₃ + 7O₂ ----------> 4NO₂ +6H₂O

Solution:

for details first we look into the reaction

4NH₃ + 7O₂ ----------> 4NO₂ + 6H₂O

4 mole 7 mol

from reaction we come to know that 4 mole of NH₃ react with 7 mole of O₂

Now we have to convert moles of NH₃ to Liter and mole of O₂ to grams

To convert moles of NH₃ to Liter formula will use

Volume of NH₃ = no. of moles x molar volume at STP

molar volume at STP = 22.4 L/mol

put values in above equation

Volume of NH₃ = 4 mol x 22.4 L/mol

Volume of NH₃ = 89.6 L

Now,

To convert moles of O₂ to grams

mass of O₂ = no. of moles x molar mass

molar mass of O₂ = 2(16) = 32 g/mol

Put values in above equation

mass of O₂ = 7 moles x 32 g/mol

mass of O₂ = 224 g

So,

We come to know that 89.6 L of NH₃ react with 224 g of O₂ to give NO₂ and water then how many liters of NH₃ will react with 5.3 g O₂

Now apply unity formula

89.6 L of NH₃ ≅ 224 g of O₂

X L of NH₃ ≅ 5.3 g of O₂

Do cross multiplication

Liter of NH₃ = 89.6 L x 5.3g / 224 g

Liter of NH₃ = 2.12 L

option 2 is correct that is 2.12 Liter of NH₃ will react with 5.3 g O₂

8 0

4 years ago

Beakers and graduated cylinders are tools used to measure volume true or false

Oduvanchick [21]

This is a false statement. Graduated cylinders measure volume, yes, but i'm afraid that beakers do not.
Hope this helps!

6 0

4 years ago

Read 2 more answers

Changing _________________ can significantly alter the area that could be affected by a chemical release.

Harman [31]

The answer is D, location, because you'd have moved spots that could be altered.

6 0

3 years ago

Which hydrocarbon belongs to the Alkyne homologous series?

Ira Lisetskai [31]

Answer:

(A) CHCH

Explanation:

Hello,

Alkynes are formed when triple bonds are formed between carbons, it means that due to the triple bonds, three bonds are already exhausted and carbon atoms need four bonds to attain the octet, for that reason, an extra bond is allowed. Now, such extra bond, when talking about hydrocarbons is filled with hydrogens, for that reason the alkyne should be (A) CHCH as it also accomplishes the following formula which is not accomplished by the rest of the options:

$C_nH_{2n-2}$

Since n=2, we have:

$C_2H_2$

Which matches with CHCH.

Best regards.

3 0

3 years ago