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3 years ago

Explain the sharing of electrons between a water molecule that forms four hydrogen bonds with the other four water molecules

Chemistry

1 answer:

Kazeer [188]3 years ago

8 0

Answer:

The sharing of electrons between a water molecule that forms four hydrogen bonds with the other four water molecules:

Explanation:

The hydrogen bond is a weak electrostatic force of attraction that exists between a covalently bonded H-atom and a highly electronegative atom like N,O or F.

In the case of the water molecule,

the highly electronegative atom is Oxygen and the intermolecular hydrogen bond in water is as shown below:

Thus H-bond is a weak electrostatic attraction formed between H-atom and O-atom in water.

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In every balanced chemical equation,each side of the equation has the same number of?

kipiarov [429]

In every balanced chemical equation, each side of the equation has the same number of <u>atoms</u> of reactants and products.

For example, let's take this chemical equation.

This is the chemical equation for carbon monoxide reacting with dihydrogen to form octane and water.

8 CO + 17 H2 → C8H18 + 8 H2O

On this side, we have 8 carbon monoxide atoms and 34 dihydrogen atoms.

On the other side, we have 8 carbon atoms and 18 hydrogen atoms + 16 hydrogen atoms.

Therefore, even though the coefficients are different there is still an equal number of atoms on each side.

8 Carbon Monoxide , 34 Dihydrogen = 8 Carbon Monoxide + 34 Dihydrogen

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3 years ago

Ammonia is formed according to the reaction below. A chemist mixes 21 grams of nitrogen gas and 18 grams of hydrogen gas in a 2.

Rama09 [41]

Answer : The mass of hydrogen gas consumed will be, 4.5 grams

Explanation : Given,

Mass of $N_2$ = 21 g

Mass of $H_2$ = 18 g

Molar mass of $N_2$ = 28 g/mole

Molar mass of $H_2$ = 2 g/mole

First we have to calculate the moles of $N_2$ and $H_2$ .

$\text{Moles of }N_2=\frac{\text{Mass of }N_2}{\text{Molar mass of }N_2}=\frac{21g}{28g/mole}=0.75moles$

$\text{Moles of }H_2=\frac{\text{Mass of }H_2}{\text{Molar mass of }H_2}=\frac{18g}{2g/mole}=9moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$

From the given balanced reaction, we conclude that

As, 1 mole of $N_2$ react with 3 moles of $H_2$

So, 0.75 moles of $N_2$ react with $3\times 0.75=2.25$ moles of $H_2$

From this we conclude that, $H_2$ is an excess reagent because the given moles are greater than the required moles and $N_2$ is a limiting reagent because it limits the formation of product.

The moles of hydrogen gas consumed = 2.25 mole

Now we have to calculate the mass of hydrogen gas consumed.

$\text{Mass of }H_2=\text{Moles of }H_2\times \text{Molar mass of }H_2$

$\text{Mass of }H_2=(2.25mole)\times (2g/mole)=4.5g$

Therefore, the mass of hydrogen gas consumed will be, 4.5 grams

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3 years ago

Why is an extraction a useful method of "pre-purification" of organic compounds? what physical properties does the process rely

ASHA 777 [7]

Explanation :

Extraction : It is a separation technique in which one compound is separated from a mixture of compounds.

In a chemical process, the solution may not contain only the desired product but there maybe a mixture of products present.

So, for obtaining the desired product we need to get rid of the other products in a mixture like catalyst (if used), other by products or unreacted starting material.

For a compound to be extracted it has to be soluble in the extracting solvent.

Therefore, this process is based on the miscibility of solute and solvent in a mixture.

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3 years ago

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How many neutrons does an element have if its atomic number is 55 and its mass number is 150?

Lynna [10]

With an atomic number of 55, that means there are 55 protons. Because electrons do not count towards atomic weight, the element would have 150-55 neutrons. So, 95 neutrons.

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3 years ago

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What is a precipitate.

horrorfan [7]

Cause (a substance) to be deposited in solid form from a solution.

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3 years ago