CHEMISTRY COLLEGE

Correctly order the steps necessary to calculate the mass of product formed in a chemical reaction given the masses of all reactants

Answers

Answer 1
Answer: 1) write down balanced chemical reaction.
2) calculate the number of moles of a reagents.
3) determining molar ratios - identify the number of moles of each reactant needed to form a certain number of moles of each product.
4) from number of moles of each product calculate mass of products using molar mass.
Answer 2
Answer:

Answer : The order of steps necessary to calculate the mass of product formed in a chemical reaction given the masses of all reactants :

(1) Determine the number of moles of each reactant by dividing its mass by its molar mass.

(2) Identify the limiting reactant as the reactant that produces the least amount of product.

(3) Determine the amount of product that could be formed from the limiting reactant using appropriate mole ratio.

(4) Determine the mass, multiply the number of moles of product formed (from the limiting reactant) by the molar mass of the product.

For example :

If we are given that 10 grams of magnesium react with 6 grams of oxygen to give magnesium oxide then calculate the mass of product formed in a chemical reaction.

Solution :

Mass of Mg = 10 g

Mass of = 6 g

Molar mass of Mg = 24 g/mole

Molar mass of = 32 g/mole

Molar mass of MgO = 40 g/mole

First we have to calculate the moles of Mg and .

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

From the balanced reaction we conclude that

As, 1 mole of react with 2 mole of

So, 0.1875 moles of react with moles of

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

Now we have to calculate the moles of

From the reaction, we conclude that

As, 1 mole of react to give 2 mole of

So, 0.1875 moles of react to give moles of

Now we have to calculate the mass of

Hence, the mass of product is 15 grams.


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MIDDLE SCHOOL

Which layer of the sun is only seen during the height of a total solar eclipse? A. Photosphere B. Corona C. Convection zone D. core

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The layer of the Sun which is only seen during the height of a total solar eclipse is: B. Corona.

An eclipse refer to an astronomical event that usually takes place when a celestial body in space gets in between the Sun and another celestial body, leading to the total or partial obscuration (blocking) of light to the celestial body.

In Science, there are two (2) main types of eclipse and these are;

  • Lunar eclipse: this is an astronomical event that takes place when planet Earth comes in between the Moon and the Sun thereby causing it to cover the Moon with its shadow.
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Total solar eclipse involves the total obscuration (blocking) of the Sun is obscured (blocked) by the Moon causing a complete engulfment of the Earth.

During the height of a total solar eclipse, Corona is the layer of the Sun that is only seen while the core, Photosphere, and Convection zone are not seen.

Read more: brainly.com/question/21828533

Question:Which layer of the sun is only seen during the height of a total solar eclipse?

Answer: Corona

Explanation:During a total solar eclipse  parts of the Sun that we normally can't see become visible but during it we can see the corona

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(jacemorris04)

HIGH SCHOOL

What is the correct Lewis structure for Acetylene C2H2?

Answers

H-C≡C-H this is the lewis structure of acetylene

HIGH SCHOOL

Acetylene gas (ethyne; HC≡CH) burns with oxygen in an oxyacetylene torch to produce carbon dioxide, water vapor, and the heat needed to weld metals. The heat of combustion for acetylene is −1259 kJ/mol. Calculate the C≡C bond energy._________ kJ/mol.

Answers

Answer : The bond energy of is 800 kJ/mol.

Explanation :

The given chemical reaction is:

For 1 mole, the reaction will be:

As we know that:

The enthalpy change of reaction = E(bonds broken) - E(bonds formed)

Given:

= heat of combustion = -1259 kJ/mol

= 413 kJ/mol

= 498 kJ/mol

= 467 kJ/mol

= 799 kJ/mol

Now put all the given values in the above expression, we get:

Therefore, the bond energy of is 800 kJ/mol.

HIGH SCHOOL

What are the principal forces holding ice together? dispersion forces only electrostatic attraction intermolecular forces sea of electrons none of the above?

Answers

Answer:
             Intermolecular Forces are the principal forces holding ice together.

Other Options are incorrect because,

Dispersion Forces are found in those molecules which are non-polar in nature. While Ice is made up of Water, which is polar in nature.

Electrostatic Attraction are found between two oppositively charged Ions. So, in water there are no Ions.

Sea of Electrons is found between metal atoms. Metal looses valence electron making a sea of electron. Hence, there is no metal atom in Water.

Result:
           Intermolecular Forces like Hydrogen Bonding exists between the water molecules.
MIDDLE SCHOOL

What prefixes is best for measuring large quantities like the mass of a person?

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The answer is Deca foo.
MIDDLE SCHOOL

What is a valence electron and why are they so important to a chemist?

Answers

Valence electrons are the electrons that reside in an atom's outermost shell. The role of valence electrons in determining an atom's reaction makes them crucial. You can count how many electrons are at the highest energy level by writing an electron configuration.

How do the valence electrons function?

The electrons in an atom's outermost shell are called valence electrons. … Because the electrons in the outermost shells of two atoms are the first to come into contact with one another and are the ones that control how an atom will react in a chemical reaction, when two atoms interact.

The outer-shell electrons of an atom are known as valence electrons. The valence electrons in an atom control its reactivity.

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brainly.com/question/371590

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They are important because they are the electrons that help the atom to bond with another atom. They are in the outer most shell. ☺️
HIGH SCHOOL

radioisotope actinium 225 has half life of 10 days, I begin with 16 kg of this isotope, how much will remain after 40 days?

Answers

COLLEGE

Which of the following is not a statement of Dalton's atomic theory of matter?a. Elements are made of atomsb. Atoms of a given element are identicalc. The atoms of one element can be identical to the atoms of another elementd. a given compound always has the same number and kinds of atomse. none of the above

Answers

Answer:

c. The atoms of one element can be identical to the atoms of another element.

Explanation:

Which of the following is not a statement of Dalton's atomic theory of matter?

a. Elements are made of atoms. TRUE. An atom is the smallest particle of a chemical element that can exist.

b. Atoms of a given element are identical. TRUE. The only slight difference is in the mass of isotopes.

c. The atoms of one element can be identical to the atoms of another element. FALSE. The atoms of different elements are different from one to another.

d. A given compound always has the same number and kinds of atoms. TRUE. This is known as Dalton's law of constant composition.

Answer:

The atoms of one element can be identical to the atoms of another element.

Explanation:

HIGH SCHOOL

Is blood a homogeneous mixture?

Answers

Blood is a heterogeneous mixture cause the blood cells are physically separate from the blood plasma. :)
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