The molarity of the NaCl in the 250 ml slat solution is 2.8M.
What is molarity?
The molarity of a solution is defined as the concentration of a solute per unit volume of the solution.
Given, the volume of the solution is 250 ml converted into l 0.25
The number of moles of NaCl is 0.70.
By the formula of molarity
[tex]M = \dfrac{n}{V}\\\\\\M = \dfrac{0.70}{0.25} = 2.8 M[/tex]
Thus, the molarity is 2.8 M.
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According to the kinetic theory of gases, an ideal gas molecule
Answer:
According to the kinetic theory of gases, in an ideal gas between two successive collisions, a gas molecule travels in a straight line.
On the basis of the information below, the dissolution of FeF2(s) in acidic solution is A. thermodynamically favorable, because K2 > 1 B. thermodynamically favorable, because K3 > 1 C. not thermodynamically favorable, because K1<1 D. not thermodynamically favorable, because K3 < 1 hint (Hess's law) FeF2(s) – Fe2+(aq) + 2 F"(aq) F"(aq) + H+ (aq) 2 HF(aq) FeF2(s) + 2 H+ (aq) 2 Fe2+ (aq) + 2 HF(aq) K1 = 2 x 10-6 K2 = 1 * 103 K3 = ?
Since K3 is greater than 1, the reaction is thermodynamically favorable.
Data;
FeF2 is in an acidic solutionK2 > 1 is thermodynamically favorablek3 > 1 is not thermodynamically favorableK1<1 is not thermodynamically favorableHess LawThis states that the heat change in a given chemical reaction is the same irrespective of the number of process in which the reaction is effected.
Using Hess Law;
[tex]rxn_3 = rxn_1 * 2rxn_2\\k_3 = k_1 * k_2^2\\k_3 = 2*10^-^6 * (1*10^3)^2\\k_3 = 2[/tex]
substituting this using Gibbs law,
[tex]\delta G^0_3 = -RT\ln K_3\\\delta G^0_3 < 0[/tex]
Since K3 is greater than 1, the reaction is thermodynamically favorable.
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How many grams of O2 are made if 2.90 moles of potassium chlorate react based on the same unbalanced equation below
Answer: 139.2 g
Explanation:
2.9 mol KClO3 (3 mol O2 / 2 mol KClO3) (32 g / 1 mol O2) = 139.2 grams :)
Suppose object A has double the specific heat and triple the mass of object B. If the same amount of heat is applied to both objects, how will the temperature change of A be related to the temperature change of B? Enter your answer to three significant figures.
Taking into account the definition of calorimetry, the temperature change of A will be one sixth of the temperature change of B.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Temperature change of A related to the temperature change of BIn this case, for object A:
QA = cA× mA× (ΔT)A
and for object B:
QB = cB× mB× (ΔT)B
You know:
Object A has double the specific heat of object B. ⇒ cA= 2× cB
Object A has triple the mass of object B. ⇒ mA= 3× mB
If the same amount of heat is applied to both objects ⇒ QA= QB
Then:
cA× mA× (ΔT)A= QB = cB× mB× (ΔT)B
2× cB × 3× mB× (ΔT)A= cB× mB× (ΔT)B
Solving:
6× cB × mB× (ΔT)A= cB× mB× (ΔT)B
(ΔT)A= (cB× mB× (ΔT)B) ÷ (6× cB × mB)
(ΔT)A=[tex]\frac{1}{6}[/tex] (ΔT)B
Finally, the temperature change of A will be one sixth of the temperature change of B.
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8) If you apply a force of 50N to an object, but the object doesn't move,
how much WORK has been accomplished? Explain.
0 J
Work = Force * Displacement
Since displacement is 0 m (object isn't moving), work would also be 0.
A sample of aluminum chloride (AIC1z) has a mass of 37.2 g.
a. How many aluminum ions are present?
b. How many chloride ions are present?
c. What is the mass in grams of one formula unit of aluminum chloride?
The answers to your questions are as follows
A) The number of aluminium ions present = 1.62 * 10²³ ions
B) The number of chloride ions present = 9.86 * 10²³ ions
C) The mass of one unit of aluminium chloride = 133.34 grams
Given data :
mass of aluminium chloride = 37.2 g
molar mass of aluminium chloride = 133.34 g/mol
note : I mole of a molecule has 6 * 10²³ molecules
Number of moles = mass / molar mass = 0.27 moles
Determine the number of aluminum ions and chloride ions presentA) aluminium ions present
moles of AlCl₃ * 6 * 10²³
= 0.27 * 6 * 10²³ = 1.62 * 10²³ ions
B) Chloride ions present
moles of AlCl₃ * 6 * 10²³ * 3
= 0.27 * 6 * 10²³ * 3
= 4.86 * 10²³ ions
C) The mass of one formula unit of aluminium chloride = 133.34 grams
Hence we can conclude that the answers to your question are as listed above.
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The acid dissociation constant of alloxanic acid is. Calculate the ph of a solution of alloxanic acid. Round your answer to decimal place
Answer:
The pH of a 4.4 M solution of boric acid is 4.3
Explanation:
at t=0 cM 0 0
at eqm
So dissociation constant will be:
Give c= 4.4 M and = ?
Putting in the values we get:
Also
Thus pH of a 4.4 M solution is 4.3
Why can water molecules store energy in more ways than neon atoms?
Select the correct answer.
A. Water molecules can rotate, but neon atoms cannot.
B. Water molecules can collide with other particles more than neon atoms can.
C. Water molecules can change their speed, but neon atoms cannot.
D. Water molecules can absorb heat more easily than neon atoms can.
Answer:
B . Water molecules can collide with other particles more than neon atoms can.
predict what happens when lead is added to nitric acid
When Lead reacted with nitric acid, lead(II) nitrate, nitrogen oxide and water are produced.
What products are produced when lead reacts with nitric acid?
Lead(II) nitrate, nitrogen oxide and water are the products which are produced by reacting lead and nitric acid with each other. The nitrogen attach with the lead molecule as well as oxygen which produces Lead(II) nitrate and nitrogen oxide.
So we can conclude that when Lead reacted with nitric acid, lead(II) nitrate, nitrogen oxide and water are produced.
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When two heterozygous parents are crossed (Aa X Aa), what percent of the offspring will have a dominant phenotype?
75% dominant and 25% resistive
A chemist adds 36.0 g of sodium chloride to 200 g of water at STP and all of the sodium chloride dissolves. What is the solute in this scenario?
A. Sodium
B. Sodium Chloride
C. Water
The solute in the scenario where a chemist adds 36.0 g of sodium chloride to 200 g of water at STP and all of the sodium chloride is sodium chloride.
What is a solute?A solute is a substance that forms a solution with another substance called solvent in a process called solubility.
According to this question, a chemist adds 36.0 g of sodium chloride to 200 g of water at STP and all of the sodium chloride dissolves in the water.
This shows that the sodium chloride is the solute added to the water (solvent).
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how many molecules are required to produce 15.8 moles of no2
✥ So, in 1.25 moles of NO2, you would have 1.25 moles of N and (2 x 1.25) 2.50 moles of O.
0.1 mole = Avogadro's number of particles (approx. 6.022x10^23 particles/mol)
So, #oxygen atoms = 2.50 mol x 6.022x10^23 atoms/mol
6.022x10^23 atoms/molOr, approximately 1.51x10^24 oxygen atoms.
Hope this answer helps you ✨
How should you prepare a buret for titration before loading it with titrant?.
The buret should be conditioned before loading it with the titrant.
What is a Buret?This is defined as laboratory apparatus which is used in quantitative chemical analysis to measure the volume of a liquid or a gas.
It should be conditioned with the titrant solution to prevent dilution from occurring as a result of cleaning it with water.
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Calculate the kovats retention index for an unknown using the retention times 1. 6 min for ch4, 12. 8 min for octane, 15. 4 min for the unknown, and 19. 6 min for nonane
For an unknown using the retention times 1. 6 min for ch4, 12. 8 min for octane, 15. 4 min for the unknown, and 19. 6 min for nonane, the kovats retention index is mathematically given as
I = 807.857
What is Kovats retention index?Generally, the equation for the Kovats index(i) is mathematically given as
[tex]I= \frac{100[n + (N - n) x (Log tr (unknown) - logtr (n))}{ logtr(N) - logtr(n))]}[/tex]
Therefore
[tex]I= \frac{100[ 1+8*(log(14.7) -log (1.5)}{log (19.8) - log (1.5)) 0]}[/tex]
I = 100[ 1+8*(0.991/1.12)]
I = 807.857
In conclusion, Kovats retention index
I = 807.857
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Kovats retention index is a system that converts the retention time into the independent constants of the system. The Kovats retention index for the unknown is 807.857.
What is the Kovats retention index?The Kovats retention index (I) is the system used in analytical techniques like gas chromatography for the conversion of the retention time. It is given mathematically as:
[tex]\rm I = \rm \dfrac{100[n+(N-n)x(Logtr(unknown)-logtr(n))}{Logtr(N)-Logtr(n)]}[/tex]
Substituting values and solving further,
[tex]\begin{aligned} \rm I &= \rm \dfrac{100[1+8 \times (Log(14.7) - log (1.5))}{(log (19.8) - log (1.5))0}\\\\&= 100 [ 1 + 8 (\dfrac{0.991}{1.12})]\\\\&= 807.857\end{aligned}[/tex]
Therefore, the Kovats retention index for an unknown is 807.857.
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#SPJ4
write the name molecular and condensed formula of alkyl groups with the following number of carbons 1,2,3,4,5,6,7,8,9,10,11,12
1)
methyl
CH3 (mol)
CH3- (struc)
2)
ethyl
C2H5
CH3-CH2-
3)
propyl
C3H7
CH3-CH2-CH2-
4)
butyl
C4H9
CH3-CH2-CH2-CH2-
5)
pentyl
C5H11
CH3-CH2-CH2-CH2-CH2-
6)
hexyl
C6H13
CH3-CH2-CH2-CH2-CH2-CH2-
7)
heptyl
C7H15
CH3-CH2-CH2-CH2-CH2-CH2-CH2-
8)
octyl
C8H17
i will stop writing the condensed formula ust add another CH2
9)
nonyl
C9H19
10)
decyl
C10H21
11)
Undecyl
C11H23
12)
dodecyl
C12H25
Distinguish between the law of conservation of mass and the law of constant proportion
A radioactive nucleus emits a beta particle, then the parent and daughter nuclei are
⇢Isotones
⇢Isotopes
⇢Isomers
⇢Isobars
Answer:
isobars
Explanation:
How?
A radioactive nucleus emits beta particle(Like uranium,radium) So the mass numbers are same for daughter nuclei .They have different atomic numbes .So they are isobars
Answer these for 40ps
Answer:
7. H
8. F
9. G.
10. D
11. A
12. E
13. B
14. C
Which shows that friction is undesirable?
a. Pushing furniture
b. Lighting a matchstick
c. Walking on wet floors
d. Approaching a spotlight
C. Walking on wet floors shows that Friction is undesirable
if you are a form of an alto cloud, where in the troposphere would you be located? high middle or low
Answer:
These clouds extend through the lower and mid-layers of the troposphere bringing rain to the surface below.
Explanation:
The bases of clouds in the middle level of the troposphere, given the prefix “alto,”
Hikers noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1. 0 atm, the temperature is 25°C, and the volume of the bag is 0. 985 L. At the top of the mountain, the temperature is 22°C and the bag has puffed up to 1. 030 L. What is the air pressure on top of the mountain? Type in your answer using the correct number of significant figures. Formula: P1V1 T1 = P2V2 T2 atm.
The final pressure or the air pressure on the top of the mountain is 0.818.
What is air pressure?Air pressure is the pressure exerted by air in the atmosphere of the earth.
By the Gas law
[tex]\dfrac{P_1V_1}{ T1} =\dfrac{ P_2V_2 }{T_2}[/tex]
Given, the pressure of the valley floor is 1 atm. = P1
The temperature is 25° C = T1
The volume of the bag is 0.985 L. = V1
The temperature at the top of the mountain is ° C = T2
Now, the volume of the bag is 1. 030 L = V2
To find P2
Put the values in the formula
[tex]\dfrac{1 atm \times0.985 L}{ 25} =\dfrac{ P_2 \times 1. 030 L }{22}\\\\0.03832 = 0.0468 \times P_2\\\\P_2= 0.818[/tex]
Thus, the final pressure is 0.818.
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Why did mendeleev leave gaps in the periodic table?.
Answer:
Mendeleev left some gaps in his periodic table because he believed that in future more elements will be discovered.
Explanation:
"Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements."
Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40. 10 g. She knows that the molar mass of NH4NO3 is 80. 0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain? 0. 50 moles 0. 500979 moles 0. 500980 moles 0. 5010 moles.
Moles are an estimation of the smallest unit of the molecules and the atoms in a sample. The moles of ammonium nitrate in a sample are 0.5010 moles.
What are moles?Moles are calculated by dividing the mass of the substance in gm by that of the molar mass in gram per mole.
Given.
Mass of ammonium nitrate = 40.10 gm
The molar mass of ammonium nitrate = 80. 0432 g/mol
Moles of ammonium nitrate are calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{40.10}{80.0432}\\\\&= 0.5010 \;\rm mol\end{aligned}[/tex]
Therefore, moles of ammonium nitrate present is option d. 0.5010 moles.
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The rusting of iron is represented by the equation 4Fe + 3O2 --> 2Fe2O3. If you have a 3.5-mol sample of iron, how many grams of O2 are needed to rust the iron completely?
34.9 g
84.0 g
16.5 g
48.6 g
Answer:
84.0 g
Balanced equation: 4Fe + 3O2 --> 2Fe2O3
3.5-mol sample of ironFind moles of oxygen:
4Fe : 3O24 : 3(3.5/4)*3 = 2.625 molesFind mass of O2
mass = moles * Mrmass = 2.625 * 32mass = 84 gSuppose a researcher wanted to extract as much zinc ion as possible from solution a without any copper (ii) impurity. How many milliliters of solution b should the researcher add to solution a?
The extraction of metal usually makes use of the method of precipitation in which a reagent is added which is able to precipitate the required metal in its pure form without impurities.
What is extraction?The process of extraction has to do with the removal of a substance from another. It is usually the way that pure substances are obtained in chemistry. The question is incomplete but I will try to give a general idea.
The extraction of metal usually makes use of the method of precipitation in which a reagent is added which is able to precipitate the required metal in its pure form without impurities. We can not make numerica;l calculatiosn as the values are missing.
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A balloon has a volume of 22.4 L at 273 K and 760 mm Hg. What will be the new volume if the pressure is
doubled to 2.00 atm?
The new volume of the gas in the balloon when the pressure is doubled is determined as 11.2 L.
General gas equation
The new volume of the balloon is determined by applying general gas equation as shown below
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁ is the initial pressure of the gas = 760 mmHg = 1 atmV₁ is the initial volume of the gas = 22.4 LT₁ is the initial temperature of the gas = 273 KP₂ is the final pressure of the gas = 2 atmT₂ is the final temperature of the gas = 273 KV₂ is the final volume of the gas = ?[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\\\V_2 = \frac{P_1V_1T_2}{T_1P_2} \\\\V_2 = \frac{1 \times 22.4 \times 273}{273 \times 2} \\\\V_2 = 11.2 \ L[/tex]
Thus, the new volume of the gas in the balloon when the pressure is doubled is determined as 11.2 L.
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How many Hydrogen atoms are there in 3NaOH?
Answer:
9 I believe
Explanation:
A mixture of three gases has a total pressure of 94.5 kpa. if the partial pressure of
the 1st gas is 65.4 kpa and the partial pressure of the 2nd gas is 22.4 kpa, what is the
partial pressure of the 3rd gas of the mixture?
Answer: 6.7 kPa
Explanation:
Pressure Total = P(partial 1) + P(partial 2) + P(partial 3) →
94.5 kPa = 65.4 kPa + 22.4 kPa + P(partial 3) →
6.7 = P(partial 3) :)
According to the Dalton's law of partial pressures the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture.
So, P[tex]_o[/tex] = P[tex]_1[/tex]+ P[tex]_2[/tex]+ P[tex]_3[/tex]
[tex]\longrightarrow[/tex]94.5 = 65.4+ 22.4 + P[tex]_3[/tex]
[tex]\longrightarrow[/tex]94.5 = 87.8+ P[tex]_3[/tex]
[tex]\longrightarrow[/tex] P[tex]_3[/tex] = 94.5 - 87.8
[tex]\longrightarrow[/tex]P[tex]_3[/tex] = 6.7 kpa
Therefore, partial pressure of the 3rd gas of the mixture is 6.7 kpa .
hello people~
Polyethylene terephthalate belongs to which class of synthetic polymer?
A. None of these
B. Polyolefin
C. Nylon
D. Polyester
Answer:
Polyester
Explanation:
Polyethylene terephthalate or shortly known as PET its a clean and strong polyesterIt is used in packagingPlease help! How many isotopes are in arsenic?
Answer:
Arsenic (33As) has 33 known isotopes and at least 10 isomers.