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3 years ago

What does this image represent?

Chemistry

2 answers:

umka2103 [35]3 years ago

7 0

I don’t really have a clear answer for you but this might help

enot [183]3 years ago

3 0

Answer:

ether group

Explanation: I looked it up

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Write a sentence that descrices how to determine the number of moles of a compound in known mass of a

sattari [20]

Explanation:

<u>Moles is denoted by given mass divided by the molecular mass , </u>

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

For example ,

For a compound X ,

The given mass i.e. w = 20 g

and the molecular mass ,i.e. , m = 10 g / mol

Then the moles can easily be calculated by using the above formula ,

n = w / m

n = 20 g / 10 g/mol = 2 mol

Hence , answer = 2 mol.

6 0

3 years ago

A decrease in height of a column in a mercury barometer means that

insens350 [35]

Answer:

increase in the air pressure

Explanation:

The barometer is a device that is used for measuring the air pressure. It is a device that uses mercury in order to show the air pressure. The mercury reacts easily to the changes in the air pressure, so it is a nice indicator for it. The air pressure can simply be defined as the weight of the air masses, and the pressure they make it because of it on the objects. The lower the air pressure, the higher up the mercury will go, as it will experience less pressure from the air, and the higher the air pressure, the lower the mercury will drop, as it will experience more pressure from the air.

5 0

3 years ago

What are duplet and octet elements ?Differentiate.

Finger [1]

Octet means presence of a total of 8 electrons in its valence shell while in case of duplet only 2 electrons are present in valence shell.

4 0

3 years ago

How many atoms in 5.01 mole of lead?

leva [86]

Answer:

30.17 × 10²³ atoms

Explanation:

Given data:

Number of moles of lead = 5.01 mol

Number of atoms = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

In given question:

1 mole = 6.022 × 10²³ atoms

5.01 mol × 6.022 × 10²³ atoms / 1 mol

30.17 × 10²³ atoms

3 0

3 years ago

Question: Draw a valid Lewis structure for the molecule CH3NO in which there are no nonzero formal charges on any of the atoms.

iVinArrow [24]

The mentioned molecule with formula, CH₃NO where no bond is found between N and O can be depicted as formamide is shown in the attachment below.

The formal charges = Number of valence electrons for the atom (V) - the number of electrons in lone pairs (N) - 1/2 (number of electrons in bond pairs, B)

FC = V - N - B/2

Thus, there is a need to calculate valence electrons, electrons in lone pairs, and the number of electrons in bond pairs for each atom in the mentioned molecule.

V or valence electrons on C = 4e, on H = 1e, on N = 5e, and on O = 6e.

N or electrons in lone pairs on C = 0e, on H = 0e, on N = 2e, and on O = 4e.

B or number of electrons in bond pairs for C = 8e, for H = 2e, for N = 6e, and for O = 4e.

Thus, the formal charges for each will be,

C = 4 - 0 - (8/2) = 0

H = 1 - 0 - (2/2) = 0

N = 5 - 2 - (6/2) = 0

O = 6 - 4 - (4/2) = 0

Lewis dot structure for the given molecule is given in the attachment below:

3 0

3 years ago

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