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4 years ago

Name the separation technique illustrated in the picture. Chemistry Homework 80 points!

Chemistry

2 answers:

Luden [163]4 years ago

8 0

its like he said down below; it is a because of the filters it has to go through

solmaris [256]4 years ago

4 0

A. Filtration

This is because of the layers of Filter it goes through to make sure it is pure.

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What pieces of information do we need in order to calculate the percent yield?

SCORPION-xisa [38]

Answer:

The maximum amount possible of product and the amount experimentally recovered

Explanation:

6 0

3 years ago

Read 2 more answers

How many grams of al(oh)3 (molar mass = 78.0 g/mol) can be produced from the reaction of 48.6 ml of .15 m koh with excess al2(so

Fudgin [204]

Taking into account the reaction stoichiometry, 0.18954 grams of Al(OH)₃ are formed from the reaction of 48.6 mL (0.0486 L) of 0.15 M KOH with excess Al₂(SO₄)₃.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

Al₂(SO₄)₃ + 6 KOH → 2 Al(OH)₃ + 3 K₂SO₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Al₂(SO₄)₃: 1 mole
KOH: 6 moles
Al(OH)₃: 2 moles
K₂SO₄: 3 moles

The molar mass of the compounds is:

Al₂(SO₄)₃: 342 g/mole
KOH: 56.1 g/mole
Al(OH)₃: 78 g/mole
K₂SO₄: 174.2 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Al₂(SO₄)₃: 1 mole ×342 g/mole= 342 grams
KOH: 6 moles ×56.1 g/mole= 336.6 grams
Al(OH)₃: 2 moles ×78 g/mole= 156 grams
K₂SO₄: 3 moles ×174.2 g/mole= 522.6 grams

<h3>Definition of molarity</h3>

Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume:

Molarity= number of moles÷ volume

<h3>Mass of Al(OH)₃ formed</h3>

In firts place, you know that 48.6 mL (0.0486 L) of 0.15 M KOH react with excess Al₂(SO₄)₃.

Replacing in the definition, you can calculate the amount of moles of KOH that react:

0.15 M= number of moles÷ 0.0486 L

Solving:

0.15 M× 0.0486 L= number of moles

<u><em>0.00729 moles= number of moles</em></u>

Then, 0.00729 moles of KOH react with excess Al₂(SO₄)₃. So, following rule of three can be applied: if by reaction stoichiometry 6 moles of KOH form 156 grams of Al(OH)₃, 0.00729 moles of KOH form how much mass of Na₂SO₄?

$mass of Al(OH)_{3} =\frac{0.00729 moles of KOHx156 grams of Al(OH)_{3}}{6 moles of KOH}$

<u><em>mass of Al(OH)₃= 0.18954 grams</em></u>

Then, 0.18954 grams of Al(OH)₃ are formed from the reaction of 48.6 mL (0.0486 L) of 0.15 M KOH with excess Al₂(SO₄)₃.

Learn more about

the reaction stoichiometry:

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molarity:

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4 0

2 years ago

Explain the main concept behind the VSEPR theory of molecular shape. How do both number and type of electron pairs influence the

vazorg [7]

According to the VSEPR hypothesis, each atom in a molecule will develop a shape that reduces the repulsion between its valence shell electrons.

<h3>What is the basis of VSEPR theory?</h3>

According to the valence-shell electron pair repulsion model, or VSEPR model, a molecule will modify its structure to maintain the greatest feasible distance between the valence electron pairs (based on the repulsive behavior of electron pairs). Given that negatively charged electrons repel one another, this makes sense.

<h3>How do both the number and type of electron pairs influence the shape of a molecule?</h3>

Electron pairings resemble groups of individuals who don't get along. They "like" to keep a safe distance between one another. Because carbon has only two electron domains, the molecular geometry of carbon dioxide is linear.

They consequently position themselves in the molecule as far apart as they can. This is how the molecule geometry is influenced by the number of electron domains.

Sulfur tetrafluoride is a trigonal bipyramidal molecule with four bonded and one non-bonding electron pair, or domain. The "shared" region between the two atoms is where the electrons in a covalent bond are most likely to be located. They become high electron density, compact zones as a result.

On the other hand, non-bonding electrons in a molecule's electron cloud are more "free" to "spread out." As a result, they are less dense and occupy a greater volume than bonding domains.

Therefore, what affects the geometry in a molecule is the "size" of a domain and the "desire" for electrons to be as far apart as feasible.

Learn more about VSEPR theory here:

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7 0

2 years ago

Name these Alkenes and alkynes using the IUPAC system

Westkost [7]

Answer:

Explanation:

8 0

4 years ago

Balance the following Equation:

pashok25 [27]

Answer:

HCl

Explanation:

Given data:

Mass of Zn = 50 g

Mass of HCl = 50 g

Limiting reactant = ?

Solution:

Chemical equation:

Zn + 2HCl → ZnCl₂ + H₂

Number of moles of Zn:

Number of moles = mass / molar mass

Number of moles = 50 g/ 65.38 g/mol

Number of moles = 0.76 mol

Number of moles of HCl:

Number of moles = mass / molar mass

Number of moles = 50 g/ 36.5 g/mol

Number of moles = 1.4 mol

Now we will compare the moles of Reactant with product.

Zn : ZnCl₂

1 : 1

0.76 : 0.76

Zn : H₂

1 : 1

0.76 : 0.76

HCl : ZnCl₂

2 : 1

1.4 : 1/2×1.4 = 0.7

HCl : H₂

2 : 1

1.4 : 1/2×1.4 = 0.7

Less number of moles of product are formed by HCl it will act limiting reactant.

6 0

3 years ago