The thermite reaction occurs when iron(III) oxide reacts with solid
aluminum. The reaction is so hot that molten iron forms as a product.
>
Fe2O3(s) + Al(s) → Fe(C) + Al2O3(s)
What mass of aluminum should be used in order to completely
consume 10.0 g Fe2O3(s)? If the reaction described produces 5.3 g
Al2O3(s), what is the percent yield?

Answers

Answer 1

Answer:

[tex]m_{Al}=3.38gAl[/tex]

[tex]Y=83.1\%[/tex]

Explanation:

Hello.

In this case, for the given balanced reaction:

[tex]Fe_2O_3(s) + 2Al(s)\rightarrow 2Fe(s) + Al_2O_3(s)[/tex]

For 10.0 g of iron (III) oxide (molar mass = 160 g/mol), based on the 1:2 mole ratio with Al (atomic mass = 27 g/mol), the required mass is then:

[tex]m_{Al}=10.0gFe_2O_3*\frac{1molFe_2O_3}{160gFe_2O_3} *\frac{2molAl}{1molFe_2O_3} *\frac{27gAl}{1molAl} \\\\m_{Al}=3.38gAl[/tex]

Moreover, as 5.3 g of aluminum oxide are actually yielded, from the 10.0 g of iron (III) oxide, we can compute the theoretical mass of aluminum oxide (molar mass = 102 g/mol) via their 1:1 mole ratio:

[tex]m_{Al_2O_3}=10.0gFe_2O_3*\frac{1molFe_2O_3}{160gFe_2O_3} *\frac{1molAl_2O_3}{1molFe_2O_3} *\frac{102gAl_2O_3}{1molAl_2O_3} \\\\m_{Al_2O_3}=6.38gAl_2O_3[/tex]

Thus, the percent yield (actual/theoretical*100%) turns out:

[tex]Y=\frac{5.3 g}{6.38 g}* 100\%\\\\Y=83.1\%[/tex]

Best regards.


Related Questions

An antacid tablet contains 640.0 mg of magnesium oxide per tablet.
What volume of 0.1000 M stomach acid (HCI) could one tablet neutralize?​

Answers

Answer:

317.6 mL

Explanation:

Step 1: Write the balanced neutralization equation

MgO + 2 HCl ⇒ MgCl₂ + H₂O

Step 2: Calculate the mass corresponding to 640.0 mg of MgO

The molar mass of MgO is 40.30 g/mol. The moles corresponding to 640.0 mg (0.6400 g) of MgO are:

0.6400 g × (1 mol/40.30 g) = 0.01588 mol

Step 3: Calculate the moles of HCl that react with 0.01588 moles of MgO

The molar ratio of MgO to HCl is 1:2. The moles of HCl are 2/1 × 0.01588 mol = 0.03176 mol

Step 4: Calculate the volume of 0.1000 M HCl that contains 0.03176 moles

0.03176 mol × (1 L/0.1000 mol) = 0.3176 L = 317.6 mL

why is soaking necessary for seed germination

Answers

Answer:

Explanation:

well it needs water like us to stay alive

A pizza is an example of a heterogeneous mixture. Explain why it is classified as such?​

Answers

Answer:

Hi!

So, a homogeneous mixture is when the parts that make up the mixture are all mixed in perfectly evenly, so they're only appearing as one uniform substance.

In a heterogeneous mixture, the pieces are not evenly mixed. A pizza has separate parts, like the crust and toppings, so it's a heterogeneous mixture.    

Lily feels tired and weak in the evenings after work. Before starting her chores, she eats dinnner. Which characteristic of life does Lily Exhibit?​

Answers

Answer:

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2. Using the following data, calculate the average atomic mass of magnesium (give your answer to the nearest
.01 ) : Show all work!
Isotope: Mg Percent abundance: 78.70%
24
Isotope: 'Mg Percent abundance: 10.13%
25
Isotope:
Mg Percent abundance: 11.17%
26

Answers

Answer:

24.32

Explanation:

From the question given above, the following data were obtained:

Isotope A:

Mass of A = 24

Abundance (A%) = 78.70%

Isotope B

Mass of B = 25

Abundance (B%) = 10.13%

Isotope C:

Mass of C = 26

Abundance (C%) = 11.17%

Average atomic mass of Mg =..?

The average atomic mass of Mg can be obtained as illustrated below:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

Average atomic mass = [(24 × 78.70)/100] + [(25 × 10.13)/100] + [(26 × 11.17)/100]

= 18.888 + 2.5325 + 2.9042

= 24.3247 ≈ 24.32

Therefore, the average atomic mass of magnesium (Mg) is 24.32

in what and what no energy is used?

Answers

Answer:

Energy is used when someone is climbing while energy is not used when someone is going down the slope

Which element in period 5 has the largest atomic radil

Answers

Answer:

francium is the answer

Explanation:

It should be noted that the element in period 5 has the largest atomic radius is Francium.

What is an atomic radius?

It should be noted that an atomic radius simply means the measure of the size of the atom from the center of the nucleus.

In this case, the element in period 5 has the largest atomic radius is Francium while Helium has the smallest radius.

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what is the density of if mass equals 4.98 volume is 5

Answers

Answer:

4.98/5 = 0.996 (don't forget to add your units)

Explanation:

Density= Mass/Volume

If your mass is 4.98_ (units of measurement are missing ) and your volume is 5 (units of measurement are missing) You plug the numbers into the equation:

4.98/5= 0.996 (don't forget to add your units)  

Which organism on the geologic time scale are now extict

Answers

Answer:The Ordovician and Cambrian Periods are referred to as the "age of invertebrates", with trilobites abundant. In this period, brachiopods became more abundant that the trilobites, but all but one species of them are extinct today.

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closely packed cells

sarcomeres

many cell junctions

an extracellular matrix

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Answer:

closely packed cells

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Explanation:

Answer:

A,B

Explanation:

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The Lysosome is marked with an x


Which among the given combinations below represent a set of isotopes?

1.40 protons and 40 neutrons
II. 41 protons and 39 neutrons
3.42 neutrons and 48 protons
4 40 protons and 42 neutrons
V. 41 protons and 40 neutrons

A. I, II, III
B. III, IV
C.1, IV and II, V
D. 1, V and II. V
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Answers

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RE
??

Answers

Answer:

An atom is the smallest particle of an element that still has the properties of that element. Atoms, in turn, are composed of subatomic particles, including negative electrons, positive protons, and neutral neutrons. The number of protons in an atom determines the element it represent

Explanation:


The human eye cannot see anything less than 40 micrometers in size. What is this length in meters?

Answers

Answer:

0.00004

Explanation:

i dont have one its just i know

Which of these are trends of elements as you go down a group?
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c ...The number of filled electron shells increases.
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Answers

Answer:

c. the number of filled electrons shells increases

Answer:

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Answer:

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So the first one is yellow and the other one is white

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Answers

Answer:

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Explanation:

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Write
a) the word equation
b) the skeletal equation
c) the reactant(s)
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Answers

Answer:

b

Explanation:

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Answers

Answer:

niether

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Beeswax is neither a mineral nor a rock it is supposed to be a heterogenous mixture.

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Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.

Physical properties of minerals include color,streak, luster,specific gravity and cleavage.

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Freezing point
Where would you place this property in the Venn diagram?

Answers

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I would pick A :) :)


1. As an electron in an atom moves from a higher energy state to a lower energy state, the atom
(A) becomes a negative ion
(C) releases energy
(B) becomes a positive ion
(D) absorbs energy

Answers

Answer:

(C) releases energy

Explanation:

From Bohr's model of the atom, we can understand the energy transitions involved when an electron moves from one energy level to another.

An electron in an energy level has a definite amount of energy associated with it at that level. When electrons change state, they must absorb or emit the exact amount of energy which will bring them from initial to final states. When the electron is excited, it moves from the ground state to an excited state, it must must absorb energy. On returning from an excited state, energy is emitted.

(C) releases energy

From Bohr's model of the atom:

We can understand the energy transitions involved when an electron moves from one energy level to another.

An electron in an energy level has a definite amount of energy associated with it at that level. When electrons change state, they must absorb or emit the exact amount of energy which will bring them from initial to final states. When the electron is excited, it moves from the ground state to an excited state, it must must absorb energy. On returning from an excited state, energy is released or emitted.

Therefore, option C is correct.

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Answers

Answer:

I'm pretty sure k

Explanation:

I'm not for sure I'm trying to help

Answer:

Potassium

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Answers

Answer:

This apparent change in the pitch (or frequency) of sound is called Doppler shift. ... You see these stretched-out light waves as having a lower frequency. Since red is at the low-frequency end of the visible spectrum, we say that light from a receding star is shifted toward red, or red shifted.

Explanation:

2. The new element Odessium (Od) was discovered in 2020 by Mr. Green. It has three isotopes: Od-284
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Answers

Answer:

Odessium (Od) has an average atomic mass of 284.45

Explanation:

Average mass is calculated from the isotopes of an element weighted by their relative abundance.

To calculate the relative average mass, you need to find the % of each isotope and use these to calculate the relative average mass

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Add all 3 answers to get the relative average mass

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plz answer quickly if you know the answer... i will mark you brainliest! :)

Answers

Answer:

okay so I'm confused for the 5 cm3 but all you have to do is multiply those 2 numbers

Answer:

it is 113g

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the formula you have to use here is mass=density*volume

sooo I multiplied it for u and gave the answer

A student inflates a balloon with helium then places it in the freezer. The student should expect
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Answers

Answer:

The balloon’s volume to decrease

Explanation:

According to Charles Law, when temperature decreases it tends to decrease the volume.

In Natural selection, individuals whose unique characteristics are well-suited for an environment tend to survive and produce more offspring. true or false?

Answers

Answer: True

Explanation:

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Answers

Answer:

I think that As is larger

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