Answer: The theoretical yield of alum is 12.09 g
Explanation:
Molarity is calculated by using the equation:
[tex]\text{Molarity}=\frac{\text{Moles}}{\text{Volume}}[/tex] ......(1)
We are given:
Molarity of sulfuric acid = 9.9 M
Volume of solution = 8.3 mL = 0.0083 L (Conversion factor: 1 L = 1000 mL)
Putting values in equation 1, we get:
[tex]\text{Moles of sulfuric acid}=(9.9mol/L\times 0.0083L)=0.08217mol[/tex]
The given chemical equation follows:
[tex]2Al+2KOH+4H_2SO_4+22H_2O\rightarrow 3H_2+2KAl(SO_4)_2.12H_2O[/tex]
By the stoichiometry of the reaction:
4 moles of sulfuric acid produces 2 moles of alum
So, 0.08217 moles of sulfuric acid will produce = [tex]\frac{2}{4}\times 0.08217=0.0411mol[/tex] of alum
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(2)
Molar mass of alum = 294.24 g/mol
Plugging values in equation 2:
[tex]\text{Mass of alum}=(0.0411mol\times 294.24g/mol)=12.09g[/tex]
Hence, the theoretical yield of alum is 12.09 g
what is the purpose of environmental regulations on chemicals
Answer: EPA regulates the production and distribution of commercial and industrial chemicals, in order to ensure that chemicals for sale and use in the United States do not harm human health or the environment.
Explanation:
Question 7 of 10
How much energy is required to melt 2 kg of aluminum? Use the table below
and this equation: Q- mLfusion
Substance
Latent Heat
Fusion
(melting)
(kJ/kg)
Melting
Point
(°C)
Latent Heat
Vaporization
(boiling) (kJ/kg)
Boiling
Point
("C)
Aluminum
400
660
1100
2450
Copper
207
1083
4730
2566
Gold
628
1063
1720
2808
Helium
5.2
-270
21
-269
Lead
245
327
871
1751
Mercury
11.4
-39
295
357
Water
335
0
2258
100
A. 2200 kJ
B. 800 kJ
C. 1600 kJ
D. 1100 kJ
Answer:
NO 2200! 800 proprobably
Explanation:
just did wrong
Answer:
800 kJ
Explanation:
A student is performing an experiment that requires measuring the boiling point of water. The accepted
value for the boiling point of pure water is 100.0°C. In the experiment, the student measured the boiling
point to be 99.2°C. What is the percent error in the student's experiment?
Answer:
.8°c my fingers jfjfjkfkrhrb
Oxidation and reduction reactions (redox) involve the loss and gain of electrons. Half-reactions are a way for us to keep track of how many electrons are gained or lost by a particular species during a chemical reaction. These half reactions can be useful in understanding how batteries work, and how other reactions that occur in your body and in nature work as well. Questions 1. In the model, are electrons lost or gained during oxidation
Answer:
Electrons are lost during oxidation (LEO)
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Answer:
Grand Tourer Injection
"Para enfriar algo rápidamente se hace una mezcla de hielo con sal o, si tiene precaución, alcohol. El punto de congelación bajará y el hielo se derretirá rápidamente. Pese a aparentar haberse perdido el frío, la mezcla formada estará en realidad a unos cuantos grados bajo cero y será mucho más efectiva para enfriar que los cubos de hielo sólidos". El fenómeno relatado corresponde a una consecuencia de:
La pregunta está incompleta, la pregunta completa es;
"Para enfriar algo rápidamente, haga una mezcla de hielo cd sal o, si
tenga cuidado, alcohol. El punto de congelación bajará y el hielo
derretir rápidamente. A pesar de parecer haber perdido el frío, la mezcla
formado será en realidad unos pocos grados bajo cero y será
mucho más eficaz para enfriar que los cubitos de hielo sólido. "La
fenómeno reportado corresponde a una consecuencia de: *
una. Aumento del punto de ebullición
B. disminución de la presión de vapor
C. aumento de la presión de vapor
D. disminución del punto de congelación
Answer:
D
Explanation:
Esta pregunta recuerda las propiedades coligativas. Las propiedades coligativas son propiedades de sustancias que dependen de la cantidad de sustancia presente.
El punto de congelación es una propiedad coligativa. Se sabe que la presencia de impurezas reduce el punto de fusión y congelación. Esto se llama depresión del punto de congelación.
Por lo tanto, la observación registrada en la pregunta es el resultado de la disminución del punto de congelación.
Which diagram shows how the covalent bonds most likely form in a phosphorous trichloride molecule?
The first diagram shows the covalent bonds most likely form in a phosphorous trichloride molecule. Hence, option A is correct.
What is a covalent bond?Covalent bonds can be polar or nonpolar depending on the electronegativity difference between the atoms involved. In a nonpolar covalent bond, the electrons are shared equally between the atoms. In a polar covalent bond, the electrons are shared unequally.
Phosphorus trichloride (PCl₃) is a covalent compound that consists of one phosphorus atom and three chlorine atoms. The three chlorine atoms are located in a plane that is perpendicular to the phosphorus atom, forming an equilateral triangle with bond angles of 120°.
The molecule has a trigonal pyramidal shape, with the phosphorus atom at the apex and the three chlorine atoms at the base of the pyramid. The fourth hybridized orbital of phosphorus contains a lone pair of electrons that is located above the trigonal plane, giving the molecule a distorted tetrahedral geometry.
Thus, option A is correct.
To learn more about the covalent bond, follow the link:
https://brainly.com/question/10777799
#SPJ2
A gas occupies 0.67 L at 350 K. What temperature is required to reduce
the volume to 0.21 L *
Answer:
109.7K
Explanation:
Using Charles law equation as follows;
V1/T1 = V2/T2
Where;
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
V1 = 0.67L
V2 = 0.21L
T1 = 350K
T2 = ?
Using the formula above;
0.67/350 = 0.21/T2
0.001914 = 0.21/T2
0.001914T2 = 0.21
T2 = 0.21/0.001914
T2 = 109.7K
who's know this one?
sand + witch?
Answer:
The Magician who lives in sand is called sand witch.
And sandwich is The name of one kind of food.
Answer:
Sandwich its food you eat it
Explanation:
can someone pls tell me if this is correct? and also if possible, pls explain the difference between fractional and simple distillation, thank you sm <3
Explanation:
everything can be found in the picture
In the formation of a covalent bond, electrons are …..
A- Gained
B- Transfered
D- Lost
E- Shared
Answer:
E-shared
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
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Please help me with this in the picture I need 8 thing wrong and 8 what should they do right
what is the balanced equation of magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide
Answer:
ExplaAt high temperatures MgCO3 decomposes to magnesium oxide and carbon dioxide. This process is important in the production of magnesium oxide. This process is called calcining: MgCO3 → MgO + CO2 (ΔH = +118 kJ/mol)
nation:
One mole of Beryllium weighs 9.0122 grams. How many atoms of Beryllium are
there?
4
9.0122
6.022 x 10^23
18
Answer:
4
Explanation:
cause 1 mole of beryllium weighs 4gram
Which statement best summarizes what happens during cellular respiration?
A. Energy in food is released and stored in ATP molecules.
B. Energy from sunlight moves through a food web.
C. Chemical energy is converted to kinetic energy.
D. Solar energy is converted and stored in chemical bonds.
Answer:
A
Explanation:
B is for photosynthesis, C and D are just energy conversions, A is all about producing energy and stored as Adenosine Triphosphate(ATP) which is respiration
17) A 0.20 M solution of HCl with a volume of 15.0 mL is exactly neutralized by the 0.10 M solution of NaOH with what volume? HINT: Use the titration formula from table T. First multiply, then divide. o 1.5 mL O 7.5 mL 7 o 3.0 mL 0 30. mL
Answer: A 0.20 M solution of HCl with a volume of 15.0 mL is exactly neutralized by the 0.10 M solution of NaOH with 3 mL volume.
Explanation:
Given: [tex]M_{1}[/tex] = 0.20 M, [tex]V_{1}[/tex] = 15.0 mL
[tex]M_{2}[/tex] = 0.10 M, [tex]V_{2}[/tex] = ?
Formula used is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula s follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.20 M ]times 15.0 mL = 0.10 M ]times V_{2}\\V_{2} = 30 mL[/tex]
Thus, we can conclude that a 0.20 M solution of HCl with a volume of 15.0 mL is exactly neutralized by the 0.10 M solution of NaOH with 3 mL volume.
Which statement best describes John Dalton’s use of creativity in his work?
Answer:
c
Explanation:
rare earth elements plz
Answer:
Rare earth elements are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium - that appear in low concentrations in the ground.
Explanation:
The rare earth elements (REE) are a set of seventeen metallic elements. These include the fifteen lanthanides on the periodic table plus scandium and yttrium. Rare earth elements are an essential part of many high-tech devices.
state and explain the trends in the atomic radius and ionization energy for elements Li to Cs.
Explanation:
ionisation energy decrease down the group as the atomic radius increases. Nuclear charge increases. Number of shell increases so the electron will experience more shielding so it would be easier for the atom to loss electron.
Anhydrous aluminium chloride contain 20.2% by mass of aluminium show that the emprical formula for anhydrous aluminium chloride
Answer:(d) has a high melting point because it has a giant covalent structure ... (i) Calculate the maximum mass of propyl ethanoate that can be made from 7.20 g of ethanoic ... (c) Anhydrous aluminium chloride contains 20.2% by mass of aluminium. (i) Show that the empirical formula for anhydrous aluminium chloride is A
Explanation:
12. Organelles allow eukaryotic cells to carry out more functions than prokaryotic cells.
True or false?
Answer:
True po
Explaination :
I hope it helps
Which would have more mass: a mole of sodium or a mole of copper? How do you know?
Answer:
copper
Explanation:
so for this you can work out the mass for both and compare
so mass = moles × mr
so mass of sodium = 1 × 23= 23 g
and mass of copper = 1 × 63.5= 63.5 g
so copper have more mass :)
The Sulphate of x is XSO4 valency of x is
Answer: m mm
/lk ac
Explanation:
The below table compares the number of electrons in two neutral atoms.
atom:
Ne 10
Na 11
Compare the electron configuration and atomic radius of these two atoms and use that to explain the difference in their reactivity.
The blood must keep moving round the body to keep the rate of diffusion high explains why
Answer:
red blood cells and diffusion.
Explanation:
this process involves red blood cells and diffusion. Red Blood cells (RBCs) are a type of blood cell whose role is to transport oxygen from the lungs to the peripheral tissues of the body. Oxygen diffuses from the alveoli of the lungs in to the RBC's, where it binds to hemoglobin.
Diffusion is a very important process within the human body and is essential to the transport of molecules within a number of organs including the lungs, kidneys, stomach and eyes. The lungs process millions of tiny air sacs that are called alveoli, each of which are in close contact with capillaries.
Which compound is a hydrocarbon?
C 2 H 6
H 2 O
CO 2
C 6 H 12 O 6
Answer:
C2H6 OR C6H12O6 THE ANSWER
Explanation:
C2H6
!!!!!!!!!!
because it has both hydrogen and carbon as given in the word "Hydro-carbon"
Someone help me with this science question pls
Answer: Can i see the question
Explanation:
In the diagram shown, what is occurring at the section marked 4?
- Temperature
Heat Energy
O Melting
O Freezing
condensation vaporization
Please select the word from the list that best fits the definition
Occurs when an axon releases chemicals that allow a signal to jump across synapses between neurons
Answer:
When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron. Neurotransmitters bind to the membrane of the dendrite.Explanation:
I hope it's helpful for you ☺️