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3 years ago

Solute separates as a solid when a saturated solution is cooled why

Chemistry

1 answer:

Klio2033 [76]3 years ago

6 0

Answer:

When a saturated solution at a high temperature is cooled, why is the solution separated as a solid? When a saturated solution at a high temperature is cooled, inter molecular space between the molecules of the solution decreases. As a result, no more solute can remain in a solution separating out as a solid crystal.

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Bohr models notes The number of periods shows you the number of _______

lorasvet [3.4K]

Answer:

The number of periods shows you the number of _______

Electron Shell

Explanation:

Modern periodic table is divided into Groups and Periods.

A period is the horizontal row of the periodic table. There are seven periods in the periodic table.

It describes the following :

The period in which a particular element found will show its electron shell

The first period has Hydrogen and Helium = 1 - shell

The second Period has Lithium to neon = 2- shells

A group is the vertical column of the periodic table . There are 18 groups in total.

It describes the following :

The group number of the element is same as the number of electrons in the outermost shell.

The element having group 1 has = 1 electron in outer shell (example Na, K)

The element having group 2 has = 2 electron in outer shell (example Ca, Mg)

The element having group 0 has = full outer shell (example Ne Xe). these are also known as noble gases

8 0

4 years ago

Determine the theoretical yield of HCl if 60.0 g of BC13 and 37.5 g of H20 are reacted according to the following balanced react

Pie

Answer : The theoretical yield of HCl is, 56.1735 grams

Explanation : Given,

Mass of $BCl_3$ = 60 g

Mass of $H_2O$ = 37.5 g

Molar mass of $BCl_3$ = 117 g/mole

Molar mass of $H_2O$ = 18 g/mole

Molar mass of $HCl$ = 36.5 g/mole

First we have to calculate the moles of $BCl_3$ and $H_2O$ .

$\text{Moles of }BCl_3=\frac{\text{Mass of }BCl_3}{\text{Molar mass of }BCl_3}=\frac{60g}{117g/mole}=0.513moles$

$\text{Moles of }H_2O=\frac{\text{Mass of }H_2O}{\text{Molar mass of }H_2O}=\frac{37.5g}{18g/mole}=2.083moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$BCl_3(g)+3H_2O(l)\rightarrow H_3BO_3(s)+3HCl(g)$

From the balanced reaction we conclude that

As, 1 mole of $BCl_3$ react with 3 mole of $H_2O$

So, 0.513 moles of $BCl_3$ react with $3\times 0.513=1.539$ moles of $H_2O$

From this we conclude that, $H_2O$ is an excess reagent because the given moles are greater than the required moles and $BCl_3$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $HCl$ .

As, 1 mole of $BCl_3$ react to give 3 moles of $HCl$

So, 0.513 moles of $BCl_3$ react to give $3\times 0.513=1.539$ moles of $HCl$

Now we have to calculate the mass of $HCl$ .

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

$\text{Mass of }HCl=(1.539mole)\times (36.5g/mole)=56.1735g$

Therefore, the theoretical yield of HCl is, 56.1735 grams

7 0

3 years ago

The empirical formula of pyrogallol is C2H2O. Its molar mass is 126 g mol-1. What is the molecular formula?C4H4O2C2H6O3C6H6O3C2H

VARVARA [1.3K]

Answer:

The molecular formula of pyrogallol is: C6H6O3

Explanation:

Step 1: Data given

Empirical formula of pyrogallol is C2H2O

Molar mass of pyrogallol = 126 g/mol

Molar mass of Carbon (C) = 12 g/mol

Molar mass of hydrogen (H) = 1.01 g/mol

Molar mass of oxygen (O) = 16 g/mol

Step 2: Calculate molar mass of the empirical formula

2*12 + 2*1+ 16 = 42 g/mol

Step 3: Calculate the molecular formula

To find the molecular formule , we should multiply the empirical formula by n

n can be found by dividing molar mass of pyrogallol by the molar mass of the empirical formula

n = 126 g/mol / 42 g/mol ≈ 3

We should mulitply the empirica lformula by 3

3*(C2H2O) gives C6H6O3

if we calculate the molar mass now:

6*12 +6*1 + 3*16 = 126 g/mol

The molecular formula of pyrogallol is: C6H6O3

6 0

3 years ago

Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas. What volume of water would be produced by this reac

AlladinOne [14]

Answer: 3.4 L

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given Volume}}{\text {Molar Volume}}=\frac{6.5L}{22.4L}=0.29moles$

The balanced chemical equation for reaction of Hydrogen chloride gas with oxygen to form water vapor and chlorine gas.

$4HCl(g)+O_2(g)\rightarrow 2H_2O(g)+2Cl_2(g)$

According to stoichiometry :

4 moles of $HCl$ produce = 2 moles of $H_2O$

Thus 0.29 moles of $HCl$ will produce = $\frac{2}{4}\times 0.29=0.15moles$ of $H_2O$

Volume of $H_2O=moles\times {\text {Molar Volume}}=0.15moles\times 22.4L/mol=3.4L$

Thus 3.4 L of of water would be produced by this reaction if 6.5 L of hydrogen chloride were consumed

4 0

3 years ago

3. A lab technician is preparing urea broth. It should be sterilized by filtration, he autoclaves it instead, just like he does

Andreas93 [3]

Urea get decomposed during autoclaving, because it is volatile. It is filter sterilized and added aseptically to your autoclave media.

Can urea be autoclaved?

Urea get decomposed during autoclaving, because it is volatile.
It is filter sterilized and added aseptically to your autoclave media.

What is autoclave sterilization?

In medical and laboratory settings, an autoclave is used to sterilise waste and lab supplies.
Heat is used in the autoclave sterilisation process to eliminate bacteria and spores. Pressurized steam provides the heat.

What is filter sterilization?

By using filtering, it is possible to exclude organisms based on their size. There are many different kinds of filtration methods, but membrane filtration is utilised to sterilise a system.
Contaminants that are larger than the pore size are captured by membrane filtration on the membrane's surface.

Learn more about autoclave media.

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5 0

2 years ago

Solute separates as a solid when a saturated solution is cooled why​

Solute separates as a solid when a saturated solution is cooled why