The amount, in grams, of potassium that would be needed to produce 23.5 grams of potassium oxide will be 19.5 grams
Stoichiometric calculationFrom the equation, the mole ratio of K to K2O is 2:1.
Mole of 23.5 K2O = mass/molar mass
Molar mass of K2O = 39x2 + 16 = 94
Mole of 23.5 K2O = 23.5/94 = 0.25 moles
Equivalent mole of K = 0.25 x 2 = 0.5 moles
Mass of 0.5 mole K = 0.5 x 39 = 19.5 grams
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Answer: Calculating mass quick check
1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.
2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g
4. 19.5 g
5. 853.5 g
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What does a magnetic force from a magnet cause objects to do?
Answer:
they pull or push on objects without touching them
Explanation:
What is difference between atom and element
Answer:
Atom is the part of an element
Explanation:
A particular element is composed of only one type of atom
How many moles of oxygen atoms are in 1.2x10^25 diphosphorus pentoxide molecules
Answer:
19.9 atoms
Explanation:
Grams --- Moles --- Atoms
You're converting from atoms (molecules) to moles.
You do not have to calculate the mass of "di phosphorus pentoxide."
Since you're already given 1.2x10^25 atoms, you start with that. You need to cancel out the atoms, so you need Avogadro's number as shown in the image.
(This has nothing to do with the problem) But in case if you're wondering, the "di" in phosphorus means there's 2 phosphorus and the "pent" means that there are 5 oxygens. So P2O5. Go to your periodic table, multiply their respective atomic masses. You would multiply phosphorus twice and oxygen 5 times. And add them up to get the overall mass.
I hope this helped!
Part 1. A slightly inflated balloon is placed about eight centimeters above a burning candle. Explain the change to the size of the balloon based on the kinetic molecular theory.
Part 2. The same balloon is now placed in a bucket of ice cold water. Explain the change to the size of the balloon based on the kinetic molecular theory.
In both cases, assume the balloon is tied tight enough so that air does not escape. (10 points)
The balloon expands above the candle but contracts in a bucket of ice.
Kinetic theory of matterAccording to the kinetic theory, gases are composed of molecules which are in constant random motion. Temperature is a measure of the average kinetic energy of the molecules of the gas.
If a balloon is held above a burning candle, the gas in the balloon expands according to Charles law. This is because, the molecules of the gas receive more energy, move faster and spread out.
When the balloon is placed in a bucket of ice. The molecules of the gas loose energy and contract hence the balloon shrinks.
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Answer:
Part 1: The balloon will expand because molecules in the gas are receiving more energy (heat), and are now moving faster and spreading out.
part 2: The balloon will contract since the molecules are losing the energy that was gained by the candle.
Explanation:
Which waves have more energy than visible light? select all that apply.
a. gamma rays
b. radio waves
c. x-rays
d. ultraviolet waves
e. microwaves
f. infared waves
Answer:
a, c, and d
Explanation:
Gamma rays, x-rays, an ultraviolet (UV) waves have more energy than visible light.
Answer:
Gamma rays, X - rays and ultraviolet ray
Explanation:
High energy waves have high frequency
Given the following laboratory observation, which of the following statements is NOT TRUE?Zn + CuBr2 à Cu + ZnBr2Cu + ZnBr2à No Reaction
To make energy, a plant must get carbon, hydrogen, and oxygen atoms. What is the source of these atoms
Answer:
Carbon comes from the air and soil, hydrogen comes from absorbing water, H20, and breaking it down into Hydrogen and oxygen :) (also where oxygen comes from)
Explanation:
Consider this reaction:
FeCl2 + 2NaOH → Fe(OH)2(s) + 2NaCl If 507 g
FeCl2 were used up in the reaction, how many grams of NaCl would be made?
A. 233.76 g NaCl
B. 649.05 g Naci
C. 467.52 g NaCl
D. 1014 g Naci
mol FeCl₂ = mass : molar mass = 507 : 127 = 3.992
mol NaCl = 2/1 x mol FeCl₂ = 2/1 x 3.992 = 7.984
mass NaCl = 7.984 x 58.5 = 467.06
closest to C. 467.52 g NaCl
507 g of FeCl₂ produced amount of NaCl is equal to 467.52 grams. Therefore, option (C) is correct.
What is the balanced chemical equation?The balanced chemical equation in which the number of atoms of each element is equal on either side of the chemical equation of the reaction.
The law of conservation of mass follows by a balancing of a chemical equation by which the total mass of the reactants must be equal to the total mass of the products.
Given, the balanced chemical reaction of iron (II) chloride and NaOH:
[tex]FeCl_2 + 2NaOH \longrightarrow Fe(OH)_2(s) + 2NaCl[/tex]
Given, the mass of the FeCl₂= 507 g
The molar mass of FeCl₂ and NaCl is 126.75 g/mol and 58.44 g/mol respectively.
126.75 g of FeCl₂ produced amount of NaCl = 2 × 58.44 g
507 g of FeCl₂ produced NaCl = (116.88/126.75) ×507 = 467.52 g
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What happens to energy when a bat hits a ball?
the ball starts moving
the energy changes form
kinetic energy moves from the bat to the ball
the total energy increases when the ball moves
HELP
Answer:
the ball starts moving
the energy changes
please help and hurry
Answer:
See below, please
Explanation:
Because the mole ratio
[tex] \frac{m(ch4)}{m(o2)} = \frac{1}{2} [/tex]
Now, at the beginning
Mole m(CH4) =4 mol, m(O2) = 5 mol
If O2 gas is fully reacted, used up,
Need m(CH4) = 2.5 mol
Hence, the mole of CH4 left
m(CH4) = 4-2.5=1.5 mol
That means
At the end of the reaction,
m(CH4) =1.5 mol
m(O2) = 0 mol
the name for a wavelength that is formed
from combined waves??
The answer is longitudinal waves
Consider the following observation by a student who was carrying out an experiment to prepare a solution of salt in the laboratory. "When 5 g of salt is added to 50 cmof warm water and stirred, all the salt dissolved. However, when 5 g of the same salt is added to 50 cm of cold water, some of it remained insoluble.
State the inference for this experiment based on the above observation.
tempreture
Explanation:
okay so the salt dissolved in the hot water because the hot water carried some latent heat and this latent heat was able to overcome and break the bonds of the salt therefore making it soluble whilst the cold water wasn't because it didn't have enough energy to overcome the bonds between the molecules of the salt
Hello!
Could you help me solve these exercises?
I want to understand the problems.
I am not the best in chemistry but I am trying to work and understand the subject.
Tank you in advance
Answer:
sorry but can i get the question? cause it is not there
When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have?
Answer:
both contains 6.02 x 1023 atoms
Explanation:
Pls, choose me as brainliest!
The chemical equation below shows the combustion of propane (C3H8). C3H8 5O2 Right arrow. 3CO2 4H2O The molar mass of oxygen gas (O2) is 32. 00 g/mol. The molar mass of C3H8 is 44. 1 g/mol. What mass of O2, in grams, is required to completely react with 0. 025 g C3H8? 0. 018 grams 0. 034 grams 0. 045 grams 0. 091 grams.
Molar mass is the ratio of the mass to that of the moles of the substance present in the compound. The mass of the oxygen required for the complete combustion is 0.091 gm.
What is mass?Mass is the quantity or the weight of the substance occupied in the reaction and is the product of the molar mass and the moles of the substance.
The reaction for the combustion of propane can be shown as:
[tex]\rm C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O[/tex]
Moles of propane can be calculated as:
[tex]\begin{aligned}\rm moles &=\rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{0.025}{44.1}\\\\&= 5.66\times 10^{-4}\end{aligned}[/tex]
The ratio of the number of moles of propane and oxygen is 1:5. So the moles of oxygen will be [tex]2.83 \times 10^{-3}\;\rm mol[/tex].
Mass of oxygen can be calculated as:
[tex]\begin{aligned}\rm mass &= \rm molar\;mass \times mass\\\\&= 2.83 \times 10^{-3}\;\rm mol \times 32 \;\rm g/mol\\\\&= 0.091\;\rm gm\end{aligned}[/tex]
Therefore, option D. 0.091 gm is the mass of oxygen.
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What does the word "kinetic" indicate about
particles in matter? W
A. large particles
B. moving particles
C. tiny particles
D. stationary particles
When 70. g of Li3N(s) (molar mass 35 g/mol) reacts with excess H2(g), 8.0 g of LiH(s) is produced. The percent yield is closest to
The percentage yield for the reaction between [tex]Li_3 N_{(s)}[/tex] and [tex]H_2[/tex], which resulted in the production of [tex]LiH_{(s)}[/tex], is 25%.
To calculate the per cent yield, we multiply the theoretical yield by 100.
There can be a significant difference in the theoretical and actual yield.
Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s)
[tex]70 g Li_3N *\frac{ 1 mol Li_3 N}{35 g} = 2 mol Li_3N\\2 mol Li_3N * \frac{2 mol LiH}{1 mol Li_3N} \\4 mol LiH * \frac{7.05 g LiH}{ 1mol LiH} = 28.20[/tex]
Percentage yield = [tex]\frac{Actual Yield}{Theoretical Yield} * 100[/tex]
[tex]\frac{8.0g}{28.20 g}[/tex] ≅ 25
From the above calculation, we found that the per cent yield is closest to 25%.
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Your question is incomplete, the probable question is:
Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s) ΔH° = -192 kJ/molrxn Because pure H₂ is a hazardous substance, safer and more cost-effective techniques to store it as a solid for shipping purposes have been developed. One such method is the reaction represented above, which occurs at 200 °C. When 70 g of [tex]Li_3N_{(s)}[/tex] (molar mass 35 g/mol) reacts with excess H₂(g), 8.0 g of LiH(s) is produced. The per cent yield is closest to:
Given the following reaction:
H2(g) + I2(g) <---> 2HI(g) Kc = 57.85
1.50 mol of each reactant was placed in a 2.00-L flask.
At equilibrium what is the concentration of HI?
At equilibrium what is the concentration of H2 and I2?
The equilibrium concentration of H2 and I2 is 0.165 M. The equilibrium concentration of HI is 1.17 M.
What is Kc?The term Kc refers to the equilibrium constant for a aqueous phase reaction. The concentrations of each specie is;
H2 = 1.5/2 = 0.75 M
I2 = 1.5/2 = 0.75 M
Setting up the ICE table;
H2(g) + I2(g) <---> 2HI(g)
I 0.75 0.75 0
C -x -x +2x
E 0.75 - x 0.75 - x 2x
Kc = [HI]^2/[H2] [I2]
57.85 = (2x)^2/(0.75 - x)^2
57.85(0.56 - 1.5x + x^2) = 4x^2
32.3 - 86.7x + 57.85x^2 = 4x^2
4x^2 - 57.85x^2 + 86.7x - 32.3 = 0
-53.85x^2 + 86.7x - 32.3 = 0
x = 0.585 M because x can not be greater than the initial concentration.
At equilibrium;
[HI] = 2x = 2(0.585) = 1.17 M
[H2] =[I2] = 0.75 M - 0.585 M = 0.165 M
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How does potassium iodide protect against radiation?.
Answer:
KI (potassium iodide) is a salt of stable (not radioactive) iodine that can help block radioactive iodine from being absorbed by the thyroid gland, thus protecting this gland from radiation injury. The thyroid gland is the part of the body that is most sensitive to radioactive iodine.
Happy To Help !!!
How many grams are there in 0.37 moles of H2O?
i think the answer would be 77 grams
Answer:
Hello there buddy
I believe your answer is
6.6656536
Hope it’s helps you buddy :)
Explanation:
~AwesomeJayden
it takes 83.0mL of a 0.450 M naOH solution to neutralize 235 mL of an HCl solution. What is the concentration of the HCl solution.
Answer:
0.159 M (3 s.f.)
Explanation:
This is an acid- base reaction, which is also known as a neutralisation reaction.
[tex]\boxed{acid \: + base→salt \: + water}[/tex]
1) Write out the balanced chemical equation.
NaOH (aq) +HCl (aq) → NaCl (aq) +H₂O(l)
The equation is balanced as on each side of the equation, there is 1 Na atom, 1 O atom, 2 H atoms and 1 Cl atom.
2) Find the number of moles of NaOH.
The symbol 'M' denotes Molarity, which is the number of moles per litre.
From the given concentration of NaOH,
1 L NaOH ----- 0.450 mol NaOH
Convert 83.0mL to litres:
Volume of NaOH
= 83 ÷1000
= 0.083 L
Moles of NaOH
= 0.083 ×0.450
= 0.03735 mol
3) Find the number of moles of HCl.
From the balanced equation, 1 mole of HCl is needed to neutralize 1 mole of NaOH.
Thus, amount of HCl
= 0.03735 mol
4) Calculate the concentration of HCl
Concentration= mol/ volume
Converting the volume from mL to L,
235 mL= 0.235 L
Concentration of HCl
= 0.03735 ÷0.235
= 0.15894 mol/L (5 s.f.)
= 0.159 M (3 s.f.)
Find the mass in grams of 3.75 mol of sucrose
Answer:
342
g/mol
Explanation:
Just get out that Periodic Table of the Elements, find the atomic masses for each atom, and add them up!
Credit to "SCooke" (User)
Why do you think it might be a bad idea to throw an aerosol can into a fire?.
Answer:
The Temperature will Increase, and the fire will Blow
Explanation:
I hope I could help
6.How many moles of gas would be in contained in a 11.2 L container that is at a
pressure of 0.75 atm and 300 K?
A.0.17
B.034
C.1.37
D.7.31
0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.
HOW TO CALCULATE NUMBER OF MOLES?The number of moles of a substance can be calculated using the following expression:
PV = nRT
Where;
p = pressure (atm)v = volume (L)n = number of molesR = gas law constantT = temperature0.75 × 11.2 = n × 0.0821 × 300
8.4 = 24.63n
n = 8.4 ÷ 24.63
n = 0.34 moles
Therefore, 0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.
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If the centre of an atom contains 8 particle that are charged, how many particles are revolving round this centre?
Explanation:
charged particles=8 which is proton and proton=no.of electron. That's why 8 particles are revolving round this center. And this atom structure is of oxygen
If the center of an atom has 8 charged particles that are protons as the neutrons are neutral there will be 8 negative charges that are electrons revolving around the center nucleus.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is solid,liquid or gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged particles and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Describe the solvation process in detail for both acids and bases.
Use a table of ka or kb values to determine whether k c for the following reaction is less than, equal to or greater than 1 ch3co2- hso4- ⇌ ch3co2h so42-
Based on the Ka and Kb values of the reactants, the Kc value of the given reaction is greater than 1.
What are the Ka and Kb values of the reactants?The acid dissociation constant, Ka, of HSO4- is 1.2 × 10^-2.
The base dissociation constant, Kb for CH3CO2- is 5.6 × 10^-10
The given equation of reaction is as follows:
CH3CO2- + HSO4- ⇌ CH3CO2H + SO4^2-The Kc of the equation = Ka/KbSubstituting the Ka and Kb values:
Kc = 1.2 × 10^-2/5.6 × 10^-10
Kc = 2.14 × 10^7
Therefore, the Kc value of the given reaction is greater than 1.
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The electron configuration of an element is 1s22s22p63s1. Describe what most likely happens when an atom of this element comes near an atom having seven valence electrons.
PLEASE HELP!!!!!!!
Answer:
The element with electron configuration 1s² 2s² 2p⁶ will most likely not react with an element having seven Valence electrons.
The electron configuration of the element in discuss is 1s² 2s² 2p⁶.
The element has enough electrons to fill it's energy level, n = 2 shell.
In essence, the element in discuss is unreactive as it has attained it's octet configuration and as such is neither in need of an electron nor ready to donate an electron.
As such, although an atom having seven Valence electrons is highly electronegative and as such is an electron attractor, the element with the full octet configuration does not react with it.
This unreactive nature of noble gases is attributed to the full octet configuration of noble gases.
P.S: The electron configuration above is the electron configuration of Neon, Ne.
If a sodium citrate sample drawn for coagulation is noted to be filled an inch below the fill line (black line), then the specimen is considered:
If a sodium citrate sample for coagulation is noted to be filled an inch below the fill line, then the specimen is considered unacceptable for coagulation studies. It alters the properties of blood.
What is blood coagulation?Blood coagulation (clotting) is a natural process by which blood cells form a gel known as a blood clot.
The blood clot generates a protective barrier against the entry of harmful substances inside the body.
Sodium citrate can be used in coagulation studies because blood factors V and VIII are relatively more stable in media that contain this substance.
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True or False: High levels of carbon monoxide must be present for a victim to become disoriented and lose consciousness.