What mass of aluminum is required if 40.0 grams of iron (III) oxide is to be completely consumed as
shown in the following reaction? (NO CALCULATOR) Fe2O3(s) + 2Al(s) → 2Fe(l) + Al2O3(s) (A) 13.5 g (B) 27.0 g (C) 40.0 g (D) 67.0 g
Answers
Answer:
13.5
Explanation:
Molar mass of Fe2O3 = 2*56 + 16*3 = 112 + 48 =160 approximate value
Number of moles of Fe2O3 = mass/molar mass = 40/160 = 0.25 mol
The reaction is balanced. Fine
1 mol of Fe2O3--------> 2 mol of Al
0.25 mol--------> 0.25*2 = 0.5 mol of Al
Mass of Al required = Number of moles * Molar mass
= 0.5 * 27 = 13.5 g
Related Questions
do our continents move? why? how?
Answers
Answer:
Yes, our continents are always slowly moving due to tectonic plates moving underneath the earths surface. :)
Explanation:
Answer:
by plate tectonics
Explanation:
plate tectonics is the process of earths place moving at a slow pace which is about only 1 to 2 cm a year
solid aluminum al and oxygen o2 gas react to form solid aluminum oxide al2o3. suppose you have 2.0 mol of al and 3.0 mol of o2 in a reactor. what would be the limiting reactant? enter its chemical formula below.
Answers
The limiting reactant for solid aluminum al and oxygen o2 gas react to form solid aluminum oxide al2o3. suppose you have 2.0 mol of al and 3.0 mol of o2 in a reaction is Al.
For given trouble chemical response will be,4Al+3O2 ⇒2Al2O3By the way of means of above stability response it's miles that four mole Al will react with three mole O2 for whole response. i.e. Al:O2= four: three so four mole Al at = three mole O2 therefore, 1 mole Al will eat= three/four mole of O21 mole Al will eat = 0.75 mole of O2 right here O2 is given 2 moles therefore Al will eat first via way of means of reacting with 0.75 mole of O2. So Al is restricting or limiting reagent for the solid aluminum al and oxygen o2 gas react to form solid aluminum oxide al2o3.
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What is the product of the reaction of 1-propanol with phenyl isocyanate, C6H5N=C=O?
Answers
The balanced equation for this reaction is:
CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O
The reaction of 1-propanol (CH3CH2CH2OH) with phenyl isocyanate (C6H5N=C=O) leads to the formation of a urethane compound. The reaction's balanced equation is as follows:CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O
In this process, the condensation reaction between the isocyanate group (-N=C=O) of phenyl isocyanate and the hydroxyl group (-OH) of 1-propanol results in the creation of a urethane molecule. A propanol group is connected to a phenyl group through an oxygen atom to produce CH3CH2CH2OC(=O)N(C6H5)CH3, the reaction's end product. The reaction also results in the production of water (H2O).Learn more about the condensation reaction:
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what is actually chemistry
Answers
Answer:
Chemistry is the branch of science that deals with the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.
Answer:
Well my teacher said a more complex way he said chemistry is the science that deals with the properties, composition, and structure of substances.
Explanation:
energy in a system can be transformed from one state to another. which statement is true for all energy transformationsA. Total energy in a system either increased or decreases B. Total energy in a system remains constant C. There must be an input of chemical energy for a transformation to occur D. Electrical energy is always converted to mechanical energy
Answers
According to the laws of thermodynamics, energy will remain constant in a system, therefore energy will not be created or destroed but it will be transformed, remaining constant. Letter B
David says, "Pure honey has nothing else added." Susan says, "The honey is not really pure. It is a mixture of many different substances." Who is right? Explain your answer.
Answers
Answer:
Susan is right
Explanation:
Honey is a natural substance extracted from bees. Like every other natural substance, honey is a mixture of many different substances. An analysis of the so called 'pure honey' will reveal that many chemical species compose the natural substance called honey.
Hence Susan is right when she says that honey is not really pure but a mixture of substances.
Muscles, bones, skin, and
organs are all mainly made up of
(PICK
ONE) -> Fats Fiber Minerals | Protein.
Answers
Answer:
The answer is Protein.
Metalloids is a synonym for …
Metals conduct electricity, while (metals/non-metals/semi-metals) do not conduct electricity.
Answers
Explanation:
Metals conduct electricity, while non-metal do not conduct electricity.
When exposed to the same amount of heat for the same amount of time, a 3 g sample of copper will experience a greater temperature change then a 12 g sample of copper due to its smaller _
Answers
Answer:
MASS
Explanation:
Formula for heat energy will be;
Q = mcΔt
Where;
m is mass
c is specific heat capacity
ΔT is change in temperature
Now, since both substances are copper, it means they will have the same specific heat capacities.
Thus, from the formula given earlier, it is seen that the mass is inversely proportional to the temperature change.
This means that the smaller the mass, the greater the temperature change.
Thus, the 3 g sample of copper will experience a greater temperature die to its smaller mass
What is the role of the ozone?
A. It protects earth's surface from dangerous radiation.
b. It reflects the sun's energy.
c. It is the source of rain clouds.
D. It retains heat energy given up by water.
Answers
Answer:
It protects the earth surface from dangerous radiation
QUESTION 3
A large system of stars held in place by mutual gravitation. IT
Answers
Answer: Galaxy
Explanation: A galaxy is a large system of stars held in place by mutual gravitation.
17. the binding of the amino acid in aminoacyl-trna is a (n) a. amide c. hemiacetal b. ester d. ether
Answers
The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond. Option b
Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.
An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.
The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.
In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.
Option b
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How is the food chain linked to the carbon cycle
Answers
Answer:
El ciclo del carbono es un ciclo biogeoquímico por el cual el carbono se intercambia entre la biosfera, la litosfera, la hidrosfera y la atmósfera de la Tierra. ... Este ciclo puede ser dividido en dos: el ciclo lento o geológico y el ciclo rápido o biológico.
Explanation:
if an atom has 35 protons in nucleus how many neutrons will it have orbiting the nueclues
Answers
Answer
Because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. So, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.
Explanation:
An analytical chemist is titrating 132.3 mL of a 0.7100 M solution of methylamine (CH,NH2 with a 0.7500 M solution of HNO 3* The p K, of methylamine is 3.36. Calculate the pH of the base solution after the chemist has added 111.4 mL of the HNO3 solution to it.
Answers
The pH of the base solution after adding the \(HNO_3\) solution is approximately 2.14.
To calculate the pH of the base solution after adding the \(HNO_3\) solution, we need to consider the acid-base reaction between methylamine (\(CH_3NH_2\)) and nitric acid (\(HNO_3\)). Methylamine acts as a base, while nitric acid is an acid. The reaction can be represented as follows:
\(CH_3NH_2 + HNO_3 \rightarrow CH_3NH_3^+ + NO_3^-\)
Since methylamine is a weak base, we need to consider its reaction with water as well:
\(CH_3NH_2 + HNO_3 \rightarrow CH_3NH_3^+ + NO_3^-\)
To solve this problem, we'll use the Henderson-Hasselbalch equation, which relates the pH of a solution to the pKa and the ratio of the conjugate acid and base forms. The pKa of methylamine is given as 3.36.
1. Calculate the initial moles of methylamine in the base solution:
Initial moles of methylamine = volume of solution (L) * molarity of methylamine (mol/L)
Initial moles of methylamine = 0.1323 L * 0.7100 mol/L
Initial moles of methylamine = 0.093963 mol
2. Calculate the moles of nitric acid added to the solution:
Moles of nitric acid = volume of solution (L) * molarity of nitric acid (mol/L)
Moles of nitric acid = 0.1114 L * 0.7500 mol/L
Moles of nitric acid = 0.08355 mol
3. Calculate the moles of methylamine remaining after the reaction:
Moles of methylamine remaining = Initial moles of methylamine - Moles of nitric acid added
Moles of methylamine remaining = 0.093963 mol - 0.08355 mol
Moles of methylamine remaining = 0.010413 mol
4. Calculate the concentration of the conjugate acid (\(CH_3NH_3^+\)) formed:
The concentration of \(CH_3NH_3^+\) = moles of methylamine remaining / volume of solution (L)
Concentration of \(CH_3NH_3^+\) = 0.010413 mol / (0.1323 L + 0.1114 L)
The concentration of \(CH_3NH_3^+\) = 0.010413 mol / 0.2437 L
Concentration of \(CH_3NH_3^+\) = 0.0427 M
5. Use the Henderson-Hasselbalch equation to calculate the pH of the base solution:
pH = pKa + log10 ([concentration of \(CH_3NH_3^+\)] / [concentration of \(CH_3NH_2\)])
Since the pKa of methylamine is given as 3.36:
pH = 3.36 + log10 (0.0427 M / 0.7100 M)
pH = 3.36 + log10 (0.0601)
pH = 3.36 + (-1.22)
pH = 2.14
Therefore, the pH of the base solution after adding the \(HNO_3\) solution is approximately 2.14.
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Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
Answers
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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the _ lobe is important in processing visual information.
a. parietal
b. frontal
c. temporal
d. occipital
Answers
Answer:
It's D
Explanation:
If you add weight to an object, it will ________ to move it.
Answers
Answer: Be hard to move it.
Explanation: If you have 1 book, and you put 5 more books on top, then the 6 books will be heavy to move.
if 1.35 g of aluminum occupies 0.500 cm^3. what is the density of aluminum
Answers
Answer:
2.7
Explanation:
Density= mass/volume
= 1.35/0.500
= 2.7
Study the chemical reaction below and answer the questions that follow: 8Al + 3Fe₃O₄ → 4Al₂O₃ + 9Fe How many moles of iron would be produced if 4.0 moles of aluminum reacts with an excess of Fe₃O₄?
A. 4.0 moles
B. 4.5 moles
C. 8.0 moles
D. 9.0 moles
Answers
Answer: the answewr is A. hope this helps!
Explanation:
Please help ASAP I will give Brainliest
How many grams of nitrogen gas are in a balloon with a volume of 35. 7 L at STP?
Answers
There are 44.62 grams of nitrogen gas in the balloon with a volume of 35.7 L at STP.
The volume of a balloon is 35.7 L at STP.
STP is the abbreviation for Standard Temperature and Pressure, which means a temperature of 273.15 K and a pressure of 101.325 kPa.
The number of grams of nitrogen gas in a balloon of this volume is requested.
A mole of any element has 6.02 × 1023 atoms, and the atomic mass of nitrogen is 14.01 grams.
One mole of a gas is equal to its molar volume, which is 22.4 L at STP. 1 mole of N2 gas = 28.02 g of N2 gas
STP's molar volume is 22.4 L, and the balloon's volume is 35.7 L.
That is, there are 35.7/22.4 moles of N2 gas in the balloon.= 1.59 moles of N2 gas
Since one mole of N2 gas weighs 28.02 g, 1.59 moles of N2 gas will weigh:
28.02 g/mol × 1.59 mol = 44.62 g
Therefore, there are 44.62 grams of nitrogen gas in the balloon with a volume of 35.7 L at STP.
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A system is compressed from 50.0 l to 5.0 l at a constant pressure of 10.0 atm. what is the amount of work done?
Answers
The amount of work done is 450.0 atm L given that a system is compressed from 50.0 L to 5.0 L at a constant pressure of 10.0 atm.
To find the amount of work done when a system is compressed from 50.0 L to 5.0 L at a constant pressure of 10.0 atm, we can use the equation:
Work = Pressure x Change in Volume
The change in volume is calculated by subtracting the initial volume from the final volume:
Change in Volume = Final Volume - Initial Volume
Change in Volume = 5.0 L - 50.0 L
Change in Volume = -45.0 L
Since the change in volume is negative (indicating compression), we can use the absolute value of the change in volume in the calculation.
Plugging in the values into the equation, we have:
Work = 10.0 atm x |-45.0 L|
Work = 10.0 atm x 45.0 L
Work = 450.0 atm L
Therefore, the amount of work done is 450.0 atm L
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What is the total number of sulfur atoms in Mg2(SO4)3
Answers
AnswerElement Symbol # of Atoms
Magnesium Mg 1
Oxygen O 4
Sulfur S 1
:
Explanation:
college/pc: chem100 - fundamentals of chemistry/10: acid-base and gas evolution reactions/10.1: acids: properties and examples
Answers
In chemistry, acids are a class of compounds that have specific properties and play essential roles in various chemical reactions. Here are some fundamental properties and examples of acids:
1. Definition: Acids are substances that, when dissolved in water, release hydrogen ions (H+). This is known as the Arrhenius definition of acids.
2. Sour Taste: Many acids have a sour taste. For example, citric acid found in citrus fruits gives them their sour taste.
3. Corrosive: Acids can be corrosive, meaning they can react with and damage certain materials, including metals and tissues. Sulfuric acid is an example of a strong corrosive acid.
4. pH: Acids have a pH value less than 7. A pH scale measures the acidity or basicity of a solution, with values below 7 indicating acidity. For example, hydrochloric acid (HCl) has a pH of around 1.
5. Reactivity: Acids can react with bases to form salts and water in a reaction called neutralization. For instance, when hydrochloric acid reacts with sodium hydroxide, it forms sodium chloride (salt) and water.
6. Examples: Some common examples of acids include:
a. Hydrochloric acid (HCl): Found in the stomach and helps in digestion.
b. Sulfuric acid (H2SO4): Used in the production of fertilizers, dyes, and detergents.
c. Acetic acid (CH3COOH): Found in vinegar and used as a food preservative.
d. Nitric acid (HNO3): Used in the production of fertilizers and explosives.
e. Carbonic acid (H2CO3): Forms when carbon dioxide dissolves in water and plays a role in maintaining the pH balance in the blood.
Understanding the properties and examples of acids is crucial for understanding their behavior in chemical reactions and their importance in various fields such as industry, biology, and environmental science.
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Which set of elements is in the order of decreasing/ increasing malleability? (Questions: 7 & 8)
Answers
Answer:the first answer is correct and 8 is O, Ge, Mn
Explanation:
which gas would most likely be found in the greatest amount in the bubbles? a) oxygen. b) ozone. c) nitrogen. d) carbon dioxide
Answers
The gas that would most likely be found in the greatest amount in bubbles is nitrogen, option c.
When a liquid undergoes a rapid change in pressure or temperature, bubbles are usually formed due to the presence of dissolved gases. Nitrogen is the most abundant gas available in natural environments such as water, due to its high solubility. Nitrogen is the primary component in Earth's atmosphere, with nearly 78% of it dissolved in water bodies.
Nitrogen is readily drawn out of the solution when you reduce pressure or the water temperature rises, leading to bubbles.
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The gas that would most likely be found in the greatest amount in the bubbles is d) carbon dioxide.
During various natural processes and chemical reactions, gases can be released in the form of bubbles. When considering the options given, the gas that is commonly produced and released in significant amounts is carbon dioxide (CO2). Carbon dioxide is a byproduct of respiration, combustion, and other metabolic activities in living organisms. It is also released during the process of fermentation, photosynthesis, and decomposition of organic matter.
Oxygen (O2) is an essential gas for respiration, but it is typically consumed rather than produced in significant quantities during most natural processes. Ozone (O3) is a less common gas and is typically found in the Earth's ozone layer. Nitrogen (N2) is a major component of the Earth's atmosphere, but it is relatively inert and does not readily form bubbles.
Carbon dioxide, on the other hand, is frequently produced and released in various natural and chemical processes, making it the gas most likely to be found in the greatest amount in bubbles.
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A student conducts an experiment to determine how the temperature of water affects the time for sugar to dissolve. In each trial, the student uses a different amount of water and a different temperature of water. What is wrong with this experimental design? A.The student changed more than one independent variable. B.The student did not change enough independent variables. C.The student needs to perform more trials. D.The student does not have a dependent variable.
Answers
What is wrong with the experimental design is that the student changed more than one independent variable.
WHAT AN EXPERIMENT SHOULD CONTAIN?
An experiment is a procedural method of solving a scientific problem or answering a scientific question. An ideal experiment should contain two variables namely: independent variable and dependent variable. Dependent variable: This is the variable that the experimenter measures in the experiment. The dependent variable responds to changes made to the independent variable. Independent variable: This is the variable that is manipulated in an experiment in order to bring about a response.In the experiment conducted by the student in this question in order to determine how the temperature of water affects the time for sugar to dissolve. The independent variable is the DIFFERENT TEMPERATURE OF WATER while the dependent variable is the TIME TAKEN FOR SUGAR TO DISSOLVE.
N.B: An experiment should have only one independent variable and all other variables should be kept constant. This is to have a reliable result.
However, this student used two independent variables (temperature and amount of water) for the experiment, which is wrong for the experimental design.Therefore, the fact that the student changed more than one independent variable is wrong for the experimental design.
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Answer:
The student changed too many variables.
Explanation:
in k-12 took the quiz
If a stoichiometrically equivalent number of moles of acid and base are mixed, both reactants will be completely used up and the amount of heat produced can be predicted from the ratios of both coefficients. If non-stoichiometric amounts of acid and base are used, the limiting reactant will predict the amount of [Select produced and the amount of [ Select) given off. Be sure to select the answers for BOTH blanks before you click
Answers
If non-stoichiometric amounts of acid and base are used, the limiting reactant will predict the amount of product produced and the amount of heat given off.
When non-stoichiometric amounts of acid and base are used, one of the reactants will be in excess and the other will be limiting. The limiting reactant is the one that is completely used up in the reaction, and it determines the amount of product that can be produced. The amount of heat given off in the reaction is directly proportional to the amount of product produced, so the amount of heat given off can also be predicted based on the limiting reactant.
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Why are valence electrons important in forming bonds?.
Answers
Valence electrons important in forming bonds because the formation of the ionic bond and the covalent bond depends on the valence electrons.
The valence electrons are those which are present on the outermost shell of the atom. the valence electron will cause the atoms are unreactive or the highly reactive.
The covalent bond is formed by the sharing of electrons between the atoms. The ionic bonds are formed by the transfer of the electrons between the atoms.
Thus, the valence electrons are those which decide the formation the bond whether it is ionic bond or the covalent bond between the atoms.
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You have the following equations: 2H2O (l) 2H2 (g) + O2 (g), ?? 572W 2N2 (g) + 3H2 (g) 2NH3 (g), HS-138 kl 2NO2 (g) + 7H2 (g) 2NH3 (g) + 4H20 (l), H 2NO2 (g) 2N2 (g) + 202 (g), ?? 990 kl ? What is the missing ??? O +118 103 kl O -138 k 0 +138 k 0 -1.18 x 103 K
Answers
By using the bond enthalpy values, we can calculate the enthalpy change for the reaction, which is -1.18 x 103 K. Therefore, the missing ??? is -1.18 x 103 K.
The following equations are given: 2H2O (l) → 2H2 (g) + O2 (g),
ΔH = +572W
2N2 (g) + 3H2 (g) → 2NH3 (g),
ΔH = -138 kl
2NO2 (g) + 7H2 (g) → 2NH3 (g) + 4H20 (l),
ΔH = HS-138 klH
2NO2 (g) → 2N2 (g) + 202 (g), ΔH = ??? 990 kl
The missing ??? is -1.18 x 103 K.
The enthalpy of reaction (ΔH) of a reaction can be defined as the amount of heat absorbed or released by the reaction during the reaction. Here, we need to find the value of ΔH for the reaction given by H2NO2 (g) → 2N2 (g) + 202 (g).
In order to find the value of ΔH, we need to see the enthalpy change for this reaction in kJ/mol. This value can be found using the bond enthalpies of the reactants and the products.
By using the bond enthalpy values, we can calculate the enthalpy change for the reaction, which is -1.18 x 103 K. Therefore, the missing ??? is -1.18 x 103 K.
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