Determine the mass of iron in 79.2 g of Fe2O3.

Answers

Answer 1

Answer: 55.4-g Fe.
Begin by balancing the equation:
2 Fe2O3 —> 4 Fe + 3 O2
Start your stoic:
(79.2g Fe2O3) <—- you start with what you have and always try to get rid of what unit you are at

Conversion to get rid of grams is
# grams over mole
^
This number comes from periodic table
Add whole mass of Fe2O3= 159.697g

(79.2g Fe2O3)(. mole. )
(159.697g)
Now get rid of moles, this is where you used the balanced numbers at the beginning
The number you are looking for goes on top—> (4 moles Fe)
(2 moles Fe2O3)
Last get mass of Fe alone and plug in to calc
Whole equation:
(79.2g)( moles)(4mFe)(55.85gFe)
(159.697)(2mole)(mole)

79.2 divides by 159.697 multiplied by 4 divided by 2 multipled by 55.85 equals 55.396406 rounded to:
55.4 g Fe

Answer 2

Answer:

Answer: The mass of iron present is 55.40 g

Explanation:

We know that:

Molar mass of iron (III) oxide = 159.7 g/mol

Molar mass of iron = 55.85 g/mol

We are given:

Mass of iron (III) oxide = 79.2 g

To calculate the mass of iron in given amount of iron (III) oxide, we use unitary method:

In 159.7 grams of iron (III) oxide, the mass of iron is (2 × 55.85) = 111.7 g

So, in 79.2 grams of iron (III) oxide, the mass of iron will be = $(111.7)/(159.7)* 79.2=55.40g$

Hence, the mass of iron present is 55.40 g

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Explanation:

11. The respiration rate of a goldfish ismeasured. The goldfish is then placed in
cold water and the respiration rate is
measured again.

Answers

Answer:

the respiration rate is the independent varaible ,measured is the indpendent variable i think

Explanation:

elements of group 8a of the periodic table are known as the noble gases. determine which of the following properties are characteristic of all naturally occurring noble gases

Answers

Answer : The properties of noble gases which usually occurs in Group 8 A periodic table are described below;

i) They have an outer electrons configuration as $ns^(2) np^(6)$

ii) Some elements like Ne and Ar does not form a stable chemical compounds.

iii) They have a large ionization energy, He has the largest ionization energy amongst the group.

The properties of noble gases are listed as follows:

1. These have outer electronic configuration of $n{s^2}n{p^6}$ , except Helium.

2. These are monoatomic under standard conditions.

3. These have high ionization energies.

4. These are the least reactive elements in the periodic table.

5. These have low melting and boiling points.

Further Explanation:

Periodic table:

A systematic arrangement of elements in various rows and columns is known as a periodic table. Here, elements are arranged in increasing order of their respective atomic numbers so that elements with the same chemical and physical properties lie in same group. Horizontal rows are called periods and vertical columns are called groups. There are 18 groups and 7 periods in a periodic table.

Elements are further classified as metals, non-metals and metalloids in the periodic table. The elements placed at the left side of the table are called metals and the elements placed at the right of the table are called non-metals. Metalloids are the elements kept between metals and non-metals.

Elements of group 8A of the periodic table are known as noble gases. These are also known as rare or inert gases. Noble gases are present at the rightmost corner of the periodic table. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) are the noble gases present in group 8A.

The general outermost electronic configuration of noble gases is $n{s^2}n{p^6}$ , except helium whose electronic configuration is $1{s^2}$ . These have completely filled valence shells in these elements and therefore they have a total of 8 valence electrons in their outermost shells, except for helium.

Due to the presence of filled valence shells, these have no tendency to react with other elements and thus called inert gases. These are the least reactive elements present in the periodic table

The noble gases have complete valence shells so these do not lose electrons and thereby possess very high ionization energies. Helium has the highest ionization energy among all the noble gases.

Because of their low reactivities, noble gases exist as monoatomic gases under standard conditions. These have weak interatomic forces and therefore have very low melting and boiling points.

Learn more:

1. Which ion was formed by providing the second ionization energy? brainly.com/question/1398705

2. Write a chemical equation representing the first ionization energy for lithium: brainly.com/question/5880605

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Periodic classification of elements

Keywords: noble gases, ns2np6, He, Ne, Ar, Kr, Xe, Rn, helium, neon, argon, krypton, xenon, periodic table, elements, groups, periods, 8A, high ionization energy, least reactive, low melting and boiling points.

Which occurs when two fluorine atoms react to produce a fluorine molecule?(1) Energy is absorbed as a bond is broken.
(2) Energy is absorbed as a bond is formed.
(3) Energy is released as a bond is broken.
(4) Energy is released as a bond is formed.

Answers

The answer is 4. When atoms mix to create a compound, energy is continuously set off, and the compound has a lesser total energy. When a chemical reaction happens, molecular bonds are shattered and other bonds are made to create unalike molecules. For instance, the bonds of two water molecules are shattered to make hydrogen and oxygen.

The change that occurs when two fluorine atoms react to produce fluorine molecule is $\boxed{\left( 4 \right){\text{ Energy is released as a bond is formed}}}$ .

Further Explanation:

The attraction between different atoms, molecules and ions is known as a chemical bond. Such bonds are responsible for the formation of chemical compounds.

An ionic bond is formed as a result of the interaction between a metal and a non-metal. Metals have the tendency to lose electrons while non-metals tend to gain electrons. Due to this, metal atoms form cations by loss of electrons and non-metals become anions with the gain of electrons.

A covalent bond is formed by the mutual sharing of electrons between the bonded atoms. It is also called molecular bond. Such bonds usually exist between two or more non-metals.

The atomic number of fluorine is 9 and it has a configuration of $1{s^2}2{s^2}2{p^5}$ . It is just one electron short of the stable configuration of neon. When two fluorine atoms approach each other, both share one of their valence electrons and form a single covalent bond. Since ${{\text{F}}_{\text{2}}}$ formed has a complete octet, its stability is quite high. The two fluorine atoms tend to bond with each other to form fluorine molecule so energy is released during the process. Therefore option (4) is correct.

Learn more:

Identification of ionic bonding: brainly.com/question/1603987
What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: chemical bond, ionic bond, covalent bond, fluorine, 9, neon, stability, octet, configuration, electron, fluorine atoms, fluorine molecule. Energy.

Which process requires an external power source?(1) neutralization (3) fermentation(2) synthesis (4) electrolysis

Answers

Answer:

The correct answer is option (4).

Explanation:

Electrolysis it is chemical technique used to separate out the constituent of solution by passing an electricity through it. Electricity is supplied to the solution is done by the external power sources.

For example:

$2H_2O(l)\overset{electricty}\rightarrow 2H_2(g)+O_2(g)$

Neutralization is the type of chemical reaction which an acid reacts with base along with the formation of water molecule and salt.

$HA+BOH\rightarrow AB+H_2O$

Fermentation is chemical reaction in which substance is break down into simpler compounds by the action of microorganism.Generally sugar or carbohydrates are broken down into alcohols or acids.

Synthesis is chemical reaction which two or more simpler compounds fused to together to give a single new compound.

(4) electrolysis requires an external power source

Consider the mixture of ethanol, c2h5oh, and o2. how many molecules of co2, h2o, c2h5oh, and o2 will be present if the reaction goes to completion?

Answers

The reaction between ethanol and oxygen must be a combustion reaction to give carbon dioxide and water as products.

The reaction between ethanol, $C_2H_5OH$ and oxygen, $O_2$ is as follows:

$C_2H_5OH+O_2\rightarrow CO_2+H_2O$

In order to balance the reaction (the number of atoms of each element in the reaction are same on both the sides that is product and reactant), $O_2$ is multiplied by 3 in the reactant side and $CO_2$ is multiplied by 2 and $H_2O$ is multiplied by 3 on product side.

So, the balanced reaction is:

$C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O$

From the balanced reaction it is clear that 1 mole of $C_2H_5OH$ reacts with 3 moles of $O_2$ to give 2 moles of $CO_2$ and 3 moles of $H_2O$ .

Since, 1 mole = $6.022* 10^(23)$ molecules (Avogadro's number)

So,

Number of molecules of $C_2H_5OH$ = $6.022* 10^(23)$ molecules.

Number of molecules of $O_2$ = $6.022* 10^(23)* 3 = 18.066* 10^(23)$ molecules.

Number of molecules of $CO_2$ = $6.022* 10^(23)* 2 = 12.044* 10^(23)$ molecules.

Number of molecules of $H_2O$ = $6.022* 10^(23)* 3 = 18.066* 10^(23)$ molecules.

Answer : The number of molecules of $CO_2,H_2O,C_2H_5OH\text{ and }O_2$ are 2, 3, 1 and 3 respectively.

Explanation :

The given balanced chemical reaction is,

$C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O$

Balanced chemical reaction is the reaction in which the number of atoms of an individual elements present on reactant side must be equal to the product side.

The species present on the left side of the right arrow is the reactant and the species present on the right side of the right arrow is the product.

From the balanced chemical reaction, we conclude that there are 1 molecule of $C_2H_5OH$ , 3 molecules of $O_2$ , 2 molecules of $CO_2$ and 3 molecules of $H_2O$ .

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