Answer:
59.9% is the percent yield for the 4.5 g of produced Al₂S₃
Explanation:
Let's determine the reaction:
3S + 2Al → Al₂S₃
First of all, let's determine the limiting reactant. We need to convert the mass to moles:
4.8 g /32.06g/mol = 0.150 moles of S
5.4 g / 26.98 g/mol = 0.200 moles of Al
3 moles of S react to 2 moles of Al
Then, 0.150 moles of S may react to (0.150 . 2)/3 = 0.1 ,moles of Al
We have 0.200 moles and we only have 0.1. As we have excess of Al, this is the excess reactant. In conclussion, the limiting reagent is S.
2 moles of Al react to 3 moles of S
Then 0.2 moles of Al may react to (0.2 . 3) /2 = 0.3 moles of S. (We only have 0.150 moles)
Let's go to the product, 3 moles of S can produce 1 mol of Al₂S₃
Then 0.150 moles of S, may produce (0.150 . 1) /3 = 0.05 moles.
We convert moles to mass to determine the thoretical yield:
0.05 mol . 150.15g /mol = 7.50g
Percent yield = (Produced yield/Theoretical yield) . 100
% = (4.5g / 7.5g) . 100 = 59.9%
difference between combustible and non - combustible
Answer:
A substance which burns in air and tends to produce heat and light is known as Combustible substances. Non-combustible substances are certain substances which are not combustible in the presence of air. Will not burn on being exposed to flame.
Answer:
A substance which burns in air and tends to produce heat and light is known as Combustible substances. Non-combustible substances are certain substances which are not combustible in the presence of air. Will not burn on being exposed to flame.
Explanation:
During the daytime, we can see things because the sun is giving off
heat energy
light energy
sound energy
electrical energy
Answer:
light energy
.................
Answer:
light energy
Explanation:
heat does not effect how we see
the sun does not have sound
electrical energy does not effect how we see
something that is made of all the same atoms or groups of atoms
Answer:
Substance-I just did this
Explanation:
Something that is made of all the same atoms or groups of atoms is called element. Atoms from at least one or maybe more elements.
What is element?A substance that's unable to be converted into another substance is known as an element. Each of the approximately 100 elements has a unique form of atom. Atoms from at least one or maybe more elements are present in everything in the cosmos.
All known elements are listed in the periodic table, with those with related properties being grouped together. The majority of elements are lustrous metals that are excellent conductors of electricity. Iron, gold, and aluminum are metals that are solid at ambient temperature.
Therefore, something that is made of all the same atoms or groups of atoms is called element.
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whats on the right side ?
Answer:
B) Products
Explanation:
Answer:
B. products
Explanation:
PLEASE ANSWER MY QUESTION
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WDYT a mixture is? Please help
Answer:
A mixture is when two substances are physically combined and can be taken apart.
Explanation:
my words
Need help with this 1 question ASAP POINTS ADDED
Answer:
Atomic number hopefully this will help
Atomic number
Explanation:
because chemical elements are organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number (example of it increasing)Which kind of wind is most likely responsible for the movement of this
weather system from Dallas to St. Louis and then to Pittsburgh?
A. Southern polar easterlig
B. Westerlies
C. Northern polar easterlies
D. Trade winds
SUBMIT
Answer: Westerlies
Explanation:
Answer:
B. Westerlies
Explanation:
I got ir right
A clownfish uses a sea anemone as a safe place to live. While living there, the clownfish lures in food for the anemone. This is an example of what type of relationship?
2) A student performed the titrations done in this experiment. The student pipetted 25mL of solution that contained saturated calcium hydroxide solution and 0.05 M calcium ions into a flask and then titrated it with 0.103 M HCl. It required 2.77mL of HCl to reach the orange-red end point. Calculate the molar solubility of calcium hydroxide in this solution.
Answer:
5.706x10⁻³M
Explanation:
Based on product solubility of Ca(OH)₂:
Ca(OH)₂(s) ⇆ Ca²⁺ + 2OH⁻(aq)
Ksp = 5.5x10⁻⁶ = [Ca²⁺] [OH⁻]²
Where [Ca²⁺] is 0.05M and [OH⁻] is obtained from the reaction with HCl.
The molar solubility, S, will be:
S = [OH⁻]/2
The [OH-] is:
Moles HCl = Moles OH⁻
2.77x10⁻³L * (0.103mol / L) = 2.85x10⁻⁴ moles OH⁻ in 25mL = 0.025L:
2.85x10⁻⁴ moles OH⁻ / 0.025L = 0.0114M = [OH⁻]
And S is:
0.0114M/2 =
5.706x10⁻³MWhich of the following is the conjugate base of HPO42-?
Answer:
A. PO4^3-
Explanation:
took the quiz on a pex
The conjugate base of HPO₄²⁻ is PO₄³⁻. Therefore, option (A) is correct.
What is the Bronsted-Lowry concept?The Bronsted-Lowry concept can be explained as an acid-base reaction where base and acid react with each other and by an exchange of proton acid, forms its conjugate base and the base generates its conjugate acid.
The Bronsted-Lowry theory is an extended version of Arrhenius's theory of acid-base. According to this concept, acid can be defined as a substance that donates a hydrogen ion or a proton and produces its conjugate base and the base can be defined as a substance that accepts a proton and creates its conjugate acid.
Bronsted-Lowry acid in the dissociation form can be represented as:
Acid ⇄ Conjugate base + H⁺
The conjugate base of Bronsted-Lowry acid HPO₄²⁻ can be represented as follows:
HPO₄²⁻ ⇄ PO₄³⁻ + H⁺
Therefore, PO₄³⁻ is the conjugate base of the Bronsted-Lowry acid HPO₄²⁻.
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HELPP ILL GUVE YOU LOTS OF POINTS EVERYTHING U WANT I REALLY NEED HELP
Answer:
but what is your question? it's just like the moon going around earth while earth along with all the other planets revolve around the sun
Explanation:
Tides are the rise and fall of the water level in the oceans and other large
bodies of water. Ocean currents are streamlike movements of water.
A. True
B. False
Answer:
Ocean water contains streamlike movements of water
What elements and molecules are used in the process of photosynthesis.
Answer: Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
Explanation:
Answer:
carbon dioxide + sun = sugar and o2
Explanation:
During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by the photosynthetic cell, such as glucose.
hope that helps have a great day
For the autoionization of water at 25°C, H2O(l) <---> H+ (aq) + OH-(aq)
Kw is 1.0 X 10^-14. What is (Delta Gº) for the process?
Answer:
ΔG° = 80 Kj/mole
Explanation:
ΔG° = -R·T·ln(Kw)
R = 0.008314 Kj/mol·K
T = 25°C = 298K
Kw = 1 x 10⁻¹⁴
ΔG° = -R·T·ln(Kw) -(0.08314Kj/mol·K)(298K)ln(1 x 10⁻¹⁴)
= -(0.008314)(298)(-32.2)Kj/mole
= 79.78Kj/mole ≈ 80Kj/mole (1 sig.-fig.)
The change in free energy for the autoionization of water at 25°C is -79.9 KJ
Using the formula;
ΔG = -RTlnK
ΔG = change in free energy = ?
R = gas constant = 8.314 J/K/mol
T = temperature = 298 K
K = equilibrium constant = 1.0 X 10^-14
Substituting into the given formula as;
ΔG = - (8.314 J/K/mol × 298 K × ln(1.0 X 10^-14))
ΔG = -7.99 × 10^4 J/mol or -79.9 KJ/mol
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In the reaction shown, how many moles of HCl are needed to react with 2.4 moles of Al?
2 Al + 6 HCI - 2 AlCl3 + 3 H2
оа
7.2
Ob
6.4
Ос
0.8
d
1.3
е
4.8
Answer:
7.2 moles
Explanation:
Since the equation is balanced, we can use a mole ratio. 6 moles of HCl : 2 moles of Al. Thus, to convert, we simply multiply by 3.
Answer:
7.2 moles of HCl
Explanation:
The balanced reaction equation of the reaction is;
2 Al + 6 HCI ---------> 2 AlCl3 + 3 H2
We can see from the reaction equation that;
6 moles of HCl reacts with 2 moles of Al
Hence;
x moles of HCl reacts with 2.4 moles of Al
x = 6 * 2.4/2
x = 7.2 moles of HCl
Protists are single-celled microscopic creatures that inhabit ponds and seawater. In which sphere do they live?
Answer:
The presence of a nucleus in all protist organisms means they are all eukaryotic. ... Whether an organism contains one or multiple cells, the nucleus – the first and ... Diatoms; Green Algae – can live in fresh or salt water and sometimes moist ... Microscopy studies can be as easy as using a pipette to drop pond water onto a ...Explanation:
The total volume of a soda can is 415 mL. Of this 415 mL, there is 60.0 mL of headspace(empty space aka volume) for the CO2 gas put in to carbonate the beverage. If a volume of 100.0 mL of gas at standard pressure is added to the can, what is the pressure in the can when it has been sealed?
Answer:
0.6 atm
Explanation:
I'm not sure about this though...
NIST employs a 20 °C (293.15 K, 68 °F) temperature and a 1 ATM absolute pressure (14.696 psi, 101.325 kPa). This standard is also known as normal pressure and temperature (abbreviated as NTP).
Explain about the standard pressure?Originally, the term "atmosphere" referred to the air pressure at sea level. Later, it was determined to be 1.01375 x 105 pascals. 100 kilopascals are the unit of pressure known as a bar. Consequently, 1 ATM = 1.01325 bar, or that one atmosphere is almost equal to one bar.
101,325 pascals, or newtons of force per square meter, is the equivalent of one standard atmosphere, sometimes referred to as one atmosphere (approximately 14.7 pounds per square inch). also see millibar The atmosphere and atmospheric pressure unit are related topics.
The answer is 0.6 ATM
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What are thermal plasmas?
What are thermal plasmas?
Answer:
Plasmas that reach a temperature equal to their surroundings.
Explanation:
I'm studying this right now and took a similar test.
Answer:
Plasmas that reach a temperature equal to their surroundings.
Explanation:
Sulfur,Iodine,.Carbon,Hydrogen put these lowest to highest
Answer:
The order is Hydrogen, Carbon, Sulfur, Iodine
Explanation:
According to the periodic table. The order is Hydrogen, Carbon, Sulfur, Iodine. You can search up an image of a periodic table, it will help you.
7. A sample of helium gas occupies a volume of 24.6 L at 2.20 atm. What would its volume be at 3.50 atm?
Answer: 15.5L
Please show your work
so, here's your answer, 15.5L (appr)
how many chemical bonds are in glucose?
Answer:
4 covalent bonds
Explanation:
Did this substance gain or lose electrons?
Answer:
it gained
Explanation:
therefore it is an anion cause it is negatively charged ion
Chemistry help equations
Answer:
no reaction will occur .
PLEASE HELP!!!!!!!! I DO NOT UNDERSTAND
Answer:
A, B, C
Explanation:
Which element is more metallic among beriliyum or calcium? Give reason
Which of the following pieces of evidence suggests there was a chemical change?
Change in color
Change in shape
Change in size
Change in state
Answer:
Change in colour will be the answer.
How many electrons does calcium donate to sulfur when calcium and sulfur form an ionic bond?
Answer:
two valence electrons
Explanation:
If you try to place the compound on the pan over the flame, what could possibly happen? Explain your answer. [2 marks] anyone please help me!!:(
Answer:
it will probably flame up or explode or maybe start boiling
What is a picture of homologous pairs of chromosomes and sex chromosomes?
nuclear DNA
stereotype
karyotype
allele
What is the temperature and pressure at STP?
Answer:
Since 1982, STP is defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 105 Pa (100 kPa, 1 bar).
Explanation:
I hope I helped