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3 years ago

1) What is the electron configuration of the element with 27 protons?

1 answer:

6 0

1) cobalt u can tell bc on a periodic table there is a small number that on cobalt is 27.

2) think that would be 11 bc in the 4th shell there can be up to 18 electrons

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Why does changing the volume of a container change the pressure of the gas in it?

klio [65]

Changing the volume increases the area that the molecules collide with so the force is spread over a larger area.

6 0

3 years ago

Read 2 more answers

How many moles of NF3 are present in a sample that contains 8.02 moles of a Fluorine atom

Ad libitum [116K]

Hey there!

The sample of NF₃ contains 8.02 moles fluorine atoms.

There are 3 fluorine atoms in each molecule, so there will be 1/3 of the moles of fluorine.

8.02 / 3 = 2.67

There are 2.67 moles of NF₃ in a sample that contains 8.02 moles fluorine atoms.

Hope this helps!

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3 years ago

Which of the following molecules has/have the same empirical formula as acetic acid (HC2O2H3)? (a) Formaldehyde (b) Benzaldehyde

chubhunter [2.5K]

Answer: Option (a) is the correct answer.

Explanation:

A chemical formula which represents proportions between the elements present in a compound is known as empirical formula.

When chemical or molecular formula is able to be reduced to smaller whole-number ratio of the elements then both molecular and empirical formulas are considered to be the same.

Relation between molecular formula and empirical formula is as follows.

Molecular formula = n × Empirical formula

where, n is an integer.

Chemical formula of acetic acid is $CH_{3}COOH$ .

Chemical formula of formaldehyde is $CH_{2}O$ . It is the smaller whole-number ratio of molecular formula of acetic acid.

Chemical formula of Benzaldehyde is $C_{6}H_{5}COOH$ .

Chemical formula of glucose is $C_{6}H_{12}O_{6}$ .

Thus, we can conclude that formaldehyde molecules has/have the same empirical formula as acetic acid ( $HC_{2}O_{2}H_{3}$ ).

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4 years ago

When sodium metal is added to water, an orange flame is observed on the metal surface. Based on this observation, what can best

pickupchik [31]

All you can conclude is that something must be burning with an orange flame.

Actually, the "something" that must be burning is the hydrogen that is produced when the sodium reacts with the water:

2Na + 2H₂O → 2NaOH + H₂ + heat

So much heat is produced that the hydrogen catches fire and some of the sodium evaporates into the flame.

The electrons in the sodium atoms get "excited" in the flame. When they drop back to a lower energy level, they emit energy in the form of an orange-yellow light.

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4 years ago

3. 53.2 g C reacts with Iron (III) oxide, how many grams of iron can be produced?

Vikentia [17]

Answer:

Explanation:

8 0

3 years ago