The difference that we can obtain for the calculation of the two step and the one step process is -150 J
What is the first law of thermodynamics?In general, the study of heat is what we generally refer to as thermodynamics. Recall that heat has a number of visible effects on a substance such as the increase in the temperature of the substance as well as a change in the state of the substance.
With this in mind, let us try to obtain the heat for the two step process as well as in the one step process as we can see from the question that we have before us just above in this context.
For the first part of the two step process, the heat is obtained from;
q = p dV
q = 2.00 atm (2.95 L - 5.90) = -5.9 atm L or -598 J
For the second step of the two step process
q = 2.5 (2.36 L - 2.95) = -149 J
Total heat for the two step process = -598 J + (-149 J) = -747 J
The value of the heat from the one step process is obtained as;
q = 2.5(2.36 L - 5.90L)
q = -897 J
Difference between q for the two-step process and q for the one-step process in joules;
-897 J - ( -747 J) = -150 J
Learn more about thermodynamics:https://brainly.com/question/1368306
#SPJ1
What is the phase of water at 0.25 atm and 0°C?A. SolidB. GasC. Solid and liquidD. Solid and gas
Answer:
A. Solid
Explanation:
We must look for the pressure of 0.25atm on the vertical axis, and the temperature of 0°C on the horizontal axis, like we can see in the following drawing:
Finally, the phase of water is solid.
The rate constant for this first‑order reaction is 0.0960 s−1
at 400 ∘C.
A⟶products
After how many seconds will 11.6%
of the reactant remain?
The time taken for 11.6% of the products to remain is 22.4 s.
What is the rate of reaction?The rate of reaction is the rate at which the reactants are depleted from the system or the rate at which the products appear in the system. Now we have a first order reaction. Recall that the formula of the first order reaction is written as;
ln[A] = -kt + ln[A]o
ln[A] = concertation at time t
t = time taken
k = rate constant
[A]o = initial concentration
Given that;
[A] = 0.116[A]o and k = 0.0960 s−1
Then;
ln0.116[A]o = -0.0960t + ln[A]o
0.0960t = ln[A]o - ln0.116[A]o
0.0960t = ln([A]o/0.116[A]o)
0.0960t = ln(1/0.116)
0.0960t = 2.154
t = 2.154/0.0960
t = 22.4 s
Learn more about first order reaction:https://brainly.com/question/12446045
#SPJ1
Is this the right answer to this question....?
Which of these is an example of active transport?
A: Transport of Na+ from a place of low concentration to a place of higher concentration
Transport of Na+ from a place of low concentration to a place of higher concentration. This is the right answer.
The sodium-potassium pump is the most common and well-known example of active transport. At the cell membrane, the sodium-potassium pump moves 3 sodium ions out of the cell and two potassium ions into the cell per ATP. Examples of active transport include the uptake of glucose in the human intestine and the uptake of minerals and ions into the root hair cells of plants.
One of the greatest examples of active transport is the movement of calcium ions out of cardiomyocytes. Cells secrete proteins such as enzymes, antibodies, and various other peptide hormones. Amino acids are transported across the intestinal mucosa of the human intestine. The movement of ions or molecules across cell membranes to regions of a higher concentration is assisted by enzymes and requires energy.
Learn more about Active transport here:-https://brainly.com/question/25802833
#SPJ1
Please help I don’t get this
The molar mass of a chemical compound is defined as the mass of the sample divided by the quantity, or number of moles, in the sample, measured in moles. The total grams of Nacl needed to get 0.241 moles exists 14.084 g.
What is meant by Molar mass?The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one.
The molar mass of a chemical compound is defined as the mass of the sample divided by the quantity, or number of moles, in the sample, measured in moles.
Molar mass of Nacl = 58.44g
Total grams of Nacl needed to get 0.241 moles = moles number × molar mass
= 0.241 × 58.44
= 14.084 g
Therefore, the total grams of Nacl needed to get 0.241 moles exists 14.084 g.
To learn more about Molar mass refer to:
https://brainly.com/question/837939
#SPJ13
How many grams of copper(II) chloride are needed to produce 42.8 g copper(II) phosphate in the presence of excess sodium phosphate?
Taking into account the reaction stoichiometry, 45.35 grams of copper(II) chloride are needed to produce 42.8 g copper(II) phosphate in the presence of excess sodium phosphate.
Reaction stoichiometryIn first place, the balanced reaction is:
3 CuCl₂ + 2 Na₃PO₄ → Cu₃(PO₄)₂ + 6 NaCl
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CuCl₂: 3 molesNa₃PO₄: 2 molesCu₃(PO₄)₂: 1 moleNaCl: 6 molesThe molar mass of the compounds is:
CuCl₂: 134.44 g/moleNa₃PO₄: 164 g/moleCu₃(PO₄)₂: 380.62 g/moleNaCl: 58.44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
CuCl₂: 3 moles ×134.44 g/mole= 403.32 gramsNa₃PO₄: 2 moles ×164 g/mole= 328 gramsCu₃(PO₄)₂: 1 mole ×380.62 g/mole= 380.62 gramsNaCl: 6 moles ×58.44 g/mole= 350.64 gramsMass of CuCl₂ requiredThe following rule of three can be applied: if by reaction stoichiometry 380.62 grams of Cu₃(PO₄)₂ are produced by 403.32 grams of CuCl₂, 42.8 grams of Cu₃(PO₄)₂ are produced by how much mass of CuCl₂?
mass of CuCl₂= (42.8 grams of Cu₃(PO₄)₂× 403.32 grams of CuCl₂) ÷380.62 grams of Cu₃(PO₄)₂
mass of CuCl₂= 45.35 grams
Finally, 45.35 grams of CuCl₂ is required to produce 42.8 g copper(II) phosphate.
Learn more about the reaction stoichiometry:
brainly.com/question/24741074
brainly.com/question/24653699
#SPJ1
Arrange these acids according to their expected pKą values. (Highest to lowest)
CH₂CH₂COOH
CI2CHCOOH
CICH₂COOH
CICH₂CH₂COOH
I need help with this homework assignment problem
The chemical symbol for the ion will be [tex]Ar^2^+[/tex]
The ion has a total of 16 electrons
The ion has a total of zero 3d electrons
Electron configurationsThe atom in question is a cation with a charge of +2.
The electron configuration goes thus: [tex]1s^2, 2s^2, 2p^6, 3s^2, 3p^4[/tex]
The total number of electrons of the ion of the atom can be calculated as:
2+2+6++2+4 = 16
With a charge of +2, it means two electrons have been lost. The total number of electrons in the atom would be:
16 + 2 = 18.
The symbol of an atom of a neutral element with 18 electrons is Ar. A neutral atom will have an equal number of protons and electrons. The number of protons in an atom is equivalent to the atomic number.
Thus, the atom is Argon with the symbol Ar.
The chemical symbol for the ion would, therefore, be [tex]Ar^2^+[/tex]
From the electron configuration, the ion has no 3d electrons. In other words, there are zero 3d electrons in the ion.
More on electron configurations can be found here: https://brainly.com/question/14283892
#SPJ1
A chemist reacts 10.5 g of Ag with 7.5 g of s in the reaction from the previous question what is the percent yield of a chemist actually obtains 9.8 g of ag2s
If 10.5 g of Ag and 7.5 g of S are reacted and 9.8 g of [tex]Ag_2S[/tex] is obtained, the percent yield of the reaction would be 81.4%
Percent yieldAg and S react to form [tex]Ag_2S[/tex] as follows:
[tex]2Ag + S -- > Ag_2S[/tex]
The mole ratio of Ag to S is 2:1.
10.5 g of Ag = 10.5/108
= 0.0972 moles
7.5 g of S = 7.5/32
= 0.2344 moles
In other words, Ag is limiting in availability.
The mole ratio of Ag to [tex]Ag_2S[/tex] = 2:1
0.0972 Ag is equivalent to 0.0972/2 = 0.0486 moles of [tex]Ag_2S[/tex]
0.0486 moles [tex]Ag_2S[/tex] weighs = 0.0486 x 247.8
= 12.04 grams
percent yield of [tex]Ag_2S[/tex] = 9.8/12.04 x 100%
= 81.4%
The percent yield of [tex]Ag_2S[/tex] that the chemist actually obtained is 81.4%.
More on percent yield can be found here: https://brainly.com/question/17042787
#SPJ1
Elizabeth is going to use an electrostatic dust print lifter at a crime scene. What is MOST likely TRUE about her evidence?
A.
It is an impression that is not very deep.
B.
It is buried deep in a carpet on the ground.
C.
It will take up to 24 hours to capture it.
D.
It is a large object that cannot be taken to a lab.
Elizabeth using an electrostatic dust print lifter at a crime scene means her evidence is most likely an impression that is not very deep and is denoted as option A.
What is Evidence?
These refers to the information and happenings which help to prove that something is true and is used in investigations so as to ensure that the culprit is caught.
The electrostatic dust print lifter employs the use of electrostatic adhesion turned on which attracts dust to it and for such to occur, then it means the impression is not very deep which is why it was chosen as the correct choice.
Read more about Crime scene here https://brainly.com/question/10702774
#SPJ1
Answer: A
Explanation:
(02.03 LC)
Which physical evidence supports the evolution of Earth due to deposition?
Concave shape of Wave Rock is the physical evidence that supports the evolution of Earth due to deposition.
Concave shape of Wave RockThe concave shape of Wave Rock is nice physical evidence of deposition in the Earth's evolution. It is a 2.7-billion-year-old land structure that served as the foundation for the formation of the Australian continent.
What is Wave Rock?A naturally occurring rock formation that resembles a tall, breaking ocean wave is called Wave Rock. The "wave" is roughly 110 m (360 ft) long and 15 m (49 ft) tall. It makes up the north side of the isolated hill known as "Hyden Rock."
Since Wave Rock is made of much tougher material from its surroundings, the weathering lowered the surrounding terrain while the bedrock remained to serve as a witness for the past.
The structure of Wave Rock was created by the weathering of the surrounding area, and this is exactly what proves the deposition part. Wave Rock was below the ground because of the deposition of the material around it over time.
To know more about Wave Rock, visit:
https://brainly.com/question/14078606
#SPJ9
Complete Question
Which physical evidence supports the evolution of Earth due to deposition?
A) Red color of Thor's Hammer
B) Concave shape of Wave Rock
C) Streaks on the face of Wave Rock
D) Broader tip than base of Thor's Hammer
i need help with chemistry equation
From the mole ratio and the masses of reactants:
The maximum amount in grams of ammonia (NH₃ ) that can be formed is 2.83 gThe formula of the limiting reagent is N₂.The amount of the excess reagent that remains after the reaction is complete is 3.65 grams.What is the maximum amount of the product that can be formed?The maximum amount of the product that can be formed is calculated from the equation of reaction as follows:
3H₂ (g) + N₂ (g) ---> NH₃ (g)The mole ratio of hydrogen to nitrogen is 3 : 1
From the given data:
4.67 grams of hydrogen gas are allowed to react with 4.67 grams of nitrogen.
The moles of the reactants is determined as follows:
Moles of hydrogen = 4.65/2 = 2.325 moles
Moles of nitrogen = 4.67/28 = 0.1667 moles
Hence, the limiting reagent is nitrogen while the excess reagent is hydrogen.
The maximum moles of ammonia (NH₃ ) that can be formed = 0.1667 moles.
mass of ammonia formed = 0.1667 * 17 grams
mass of ammonia formed = 2.83 g
The moles of the excess reagent remaining after the reaction is complete = 2.325 - (0.1667 * 3) = 1.825
moles of the excess reagent remaining = 1.835 moles
mass of the excess reagent remaining = 1.825 * 2
mass of the excess reagent remaining = 3.65 grams
Learn more about limiting reagents at: https://brainly.com/question/22199171
#SPJ1
Carbon disulfide (CS2) reacts with excess chlorine (Cl2) to produce carbon tetrachloride (CCl4) and disulfur dichloride (S2Cl2). If 73.5 g of CS2 yields 86.3 g of CCl4, what is the percent yield?
The percent yield is 85.16%
Percent yield is the percent ratio of the weight of the product obtained to the theoretical yield and we calculate the percent yield by dividing the experimental yield by the theoretical yield and multiplying the result by 100 to express the final answer in %
Here given data is carbon disulfide (CS₂) reacts with excess chlorine (Cl₂) to produce carbon tetrachloride (CCl₄) and disulfur dichloride (S₂Cl₂) if 73.5 g of CS₂ yields 86.3 g of CCl₄ means reaction is
CS₂ + Cl₂ → CCl₄ + S₂Cl₂
And here weight are given CS₂ = 73.5 g and CCl₄ = 86.3 g
So, % yield = ratio of the weight
% yield = 73.5 g/86.3 g×100
% yield = 85.16%
Know more about percent yield
https://brainly.com/question/6222572
#SPJ1
I need help understanding this is not a test but study material
Explanation:
The law of conservation of mass:
In a chemical reaction, the mass is neither created nor destroyed. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
------------------
According to this task, the statement that demonstrates the law of conservation of mass is:
Answer: there are 10 aluminum (Al) atoms represented on each side of the equation.
what is percentage of volume of a phenol (c6,h5,oh) in a solution containing of 25.5ml of phenol in 495ml of ethanol (ch3,ch2,oh)?
Molecular mass of Phenol = 94 g/mol
Ethanol = 46 g/mol
Weight of Phenol Taken = 25.5 g
Ethanol = 495 g
Total Weight = 495 + 25.5 = 520.5 g
So moles of phenol = 25.5 94 = 0.27
mole of ethanol = 495 / 46 = 10.76
1. Mole fraction of phenol = 0.27 / (10.76 + 0.27) = 0.27 / 11.03 = 0.0244
2. Mass % of phenol = mass of phenol / total mass x 100
25.5 / x 10.5 = 4.9 %
3. Molar concentration of phenol = mol Phenol/mass of solvent (kg)
the solvent is ethanol => Because presents an exceedingly high amount
0.27 / 495 X 1000 m = 0.54m
4. Molarity = moles of phenol/ vol of solution (in liter)
Density of solution = 0.938 g/mL 44
Mass of solution = 520.5 g
Volume of Solution = Mass / Density = 520.5 / 0.938 = 554.9 or 555 ml
Molarity = (0.27 / 555)X 1000 = 0.48 M.
Phenol has unique properties and is not classified as alcohol. They are highly acidic because the aromatic ring is tightly bound to oxygen and the bond between oxygen and hydrogen is relatively loose.
Learn more about A phenol here:-https://brainly.com/question/24387767
#SPJ1
Avogadro's number is the number of
Avogadro's number is number of elementary entities (atoms or molecules) comprising one mole of a given substance.
What is the Avogadro's number?Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³.
It is the number of elementary entities (atoms or molecules) comprising one mole of a given substance.
The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction.
Therefore, it can be simply said that Avogadro's number is the number of units in one mole of a substance.
Learn more about Avogadro's number at: https://brainly.com/question/11907018
#SPJ1
In the following acid-base reaction,H₂PO₄⁻ is theH₂PO₄⁻ (aq) + NH₃ (aq) ---> HPO₄²⁻ (aq) + NH₄⁺ (aq)a) conjugate acidb) acidc) base
Explanation:
H₂PO₄⁻ (aq) + NH₃ (aq) ---> HPO₄²⁻ (aq) + NH₄⁺ (aq)
acid base conjugate base conjugate acid
H₂PO₄⁻ is donating a proton to NH₃. So H₂PO₄⁻ is acting like an acid, and NH₃ is acting as the base. Then, HPO₄²⁻ is the conjugate base of H₂PO₄⁻ and NH₄⁺ is the conjugate acid of NH₃.
Answer: b) acid
which species has 18 electrons
Answer:
Argon - Ar has 18 electrons
An ion that has 18 electrons is a potassium ion.
Hope this helps!
Explanation:
i need help with chemistry equation
Answer:
12.1 grams and 77.8%
Explanation:
(Note: in this answer, sig figs are rounded in the end, not along the way) The molar ratio of calcium sulfate to calcium hydroxide is 1:1
there are 6.56 grams of calcium hydroxide, so the number of moles is the number of grams / the molar mass, which is (6.56 grams) / (74.093 g/mole)
=0.08854 moles of calcium hydroxide
Theoretically, 0.08854 moles of calcium hydroxide would make 0.08854 moles of calcium sulfate.
To find the number of grams of calcium sulfate, multiply the number of moles by the molar mass, which is .08854 * 136.14 = 12.054 grams, or
12.05 grams
The percentage yield of calcium sulfate is just the actual yield / predicted yield, which is 9.37/12.05 which is 0.7776, or 77.8%
In the reaction of magnesium nitrate (aq) and sodium hydroxide (aq), the spectator ions are:
Answer:Magnesium nitrate will react with sodium hydroxide to form magnesium hydroxide and sodium nitrate.
Explanation:
describe how to use Le Chateliers principle to predict the possible ways a chemical system can respond to changes
According to Le Châtelier's principle, if a dynamic equilibrium is disturbed by changing the conditions, the equilibrium position will move to compensate for the change and restore the equilibrium.
What is meant by Le Chatelier's Principle?Le Chatelier's Principle states that "a system at equilibrium will modify itself in such a way to minimize the effect of that change made in it" when external stress is applied by changing concentration, pressure, or temperature.
Change in Concentration:
A + B ⇆ C
In order to counteract the impact of the additional reactant added, the equilibrium will shift forward and produce more product when the concentration of reactants (A or B) is increased. Or it will react in the opposite way if product (C) is added.
Change in Pressure:
A + B ⇆ C
Because there is a decrease in volume at the product side, if pressure is applied to this equilibrium, the equilibrium will shift in the direction of forwarding motion (1 mole as compared to reactants which are 2 moles). If the pressure drops, the opposite situation will be seen.
Change in Temperature:
A + B ⇆ C + Heat
The heat produced in this exothermic reaction (heat is evolved) is on the product side. The equilibrium will shift in the opposite direction as the temperature rises. A drop in temperature will cause the equilibrium to move forward.
To learn more about Le Chatelier's Principle refer to:
https://brainly.com/question/15074130
#SPJ4
Following the procedure of this experiment, you determined that your 1.000g sample of a fruit drink powder contained 6.04E-5 moles of acidic protons. Of these acidic protons, 2.00E-5 moles were due to VC. The rest were due to an acid H2B in the sample. Calculate: a) Moles of acidic protons due to H2B in the fruit drink sample b) Moles of H2B in the fruit drink sample
a.) 4.04E-5 moles of acidic protons
b.) 2.02E-5 mole of H2B in the fruit drink
What are protons?A proton can be defined as a stable subatomic particle with symbol p , H⁺, or ¹H⁺ that has a positive electric charge of +1 e elementary charge.
The mole with its symbol mol, is the unit of amount of substance in the International System of Units. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.
The formula for the number of moles formula is expressed as follows;
Number of moles = Mass of substance / Mass of one mole.
n = m/M
from the given above, we have that
mass of sample = 1.00g
a.) Moles of acidic protons due to H2B in the fruit drink sample will be
6.04E-5 moles of acidic protons - 2.00E-5 moles were due to VC
= 4.04E-5 moles of acidic protons.
b.) Moles of H2B in the fruit drink sample = 2.02E-5 mole of H2B in the fruit drink
Learn more about moles at ; https://brainly.com/question/24322641
#SPJ1
Can water stay liquid below zero degrees Celsius?
Water cannot stay liquid below zero degree Celsius (0°C) because it freezes at 0°C.
What is freezing point?Freezing point is the temperature at which a liquid freezes, and the solid and liquid phases are in equilibrium.
Different liquids have different freezing points. Water as a liquid has a freezing point of 0 °C. This means that water in a liquid state will begin to turn solid (ice) at that temperature.
For example;
Ethanol has a freezing point of -114.1 °CMercury has a freezing point of -38.83 °CIn accordance with this question, water cannot stay liquid below a temperature of 0°C because it has a freezing point of 0°C.
Learn more about freezing point at: https://brainly.com/question/3121416
#SPJ1
A certain reaction has an activation energy of 36.11 kJ/mol.
At what Kelvin temperature will the reaction proceed 4.50
times faster than it did at 315 K?
Kelvin temperature will the reaction proceed 4.50 times faster than it did at 315 K is 293K
Temperature is the degree of hotness or coldness of an object
Here given data is certain reaction has an activation energy of 36.11 kJ/mol and reaction proceed 4.50 times faster than it did at 315 K and we have to find kelvin temperature = ?
Then, we have to use the arrhenius equation and set k1 = 1 and k2 = 4.50 because rate = k[A] so as long as concentration of reactants doesn't vary, rate is proportional to k
ln (k₂/k₁) = Ea/R(1/T₁ - 1/T₂)
k₂ = 4.50
k₁ = 1
Ea = 36.11 J/mole
R = 8.314 J/mol⁻k
T ₁= 315 K
T₂ = ?
ln(4.50/1) = 36.11/8.314 (1/314 - 1/T₂)
1.50 = 4.343 (1/315 - 1/T₂)
1.50 = 0.013 - 4.343/T₂
-1.48 = - 4.343/T₂
T₂ = 293 K
Know more about temperature
https://brainly.com/question/23822575
#SPJ1
Sergeant Jeffers likes to use a photo array when he is conducting an investigation. Because of this, what is he MOST likely to do in his current case?
A.
He uses a 35mm camera, a digital camera, and a video camera at the scene.
B.
He takes photos of every piece of evidence before it is sent to the lab.
C.
He has a sketch artist draw the subject based on descriptions.
D.
He asks eyewitnesses to pick out the subject from many options.
He takes photos of every piece of evidence before it is sent to the lab is what Sergeant Jeffers who likes photo array will do in this case and is denoted as option B.
What is Investigation?This is defined as the process in which something is examined and it is usually accompanied with thorough search for facts so as to get accurate and meaningful results.
The use of photo arrays for investigation means that photos of every piece of evidence is taken which is worked on by the professional through series of techniques so as to catch the culprit and ensure justice is served.
Read more about Investigation here https://brainly.com/question/25578076
#SPJ1
5.85 gram of sodium chloride (NaCl) is dissolved in 250ml solution. Calculate The mass percentage of the solute?
According to the given statement The mass percentage of the solute is 2.2%.
What does mass percentage mean?As a mass percentage, an element's quantity in a compound or component of a combination can be expressed. The mass percentage is calculated by multiplying this result by 100% after dividing the comparable higher by the masses of each component.
What purposes does mass percentage function?When the mass of a solute and the mass of a solution are known, the concentration of a solution is expressed as a mass percent.
Briefing:A mass percentage is calculated by multiplying the ratio of the solute's mass to the total mass by 100.
5.85/250+5.85*100
=2.2 %
The mass percentage of the solute is 2.2%.
To know more about Mass percentage visit:
https://brainly.com/question/16885872
#SPJ9
What electrons participate in chemical bonding?
Answer:
valence electrons
Explanation:
they are the electrons that are in the outermost shell
What does it mean it for a solution to be supersaturated?
O A. The maximum amount of solute has been dissolved.
O B. More solute can still be dissolved in the solvent.
O C. More solute has dissolved than should be possible.
D. The dissolving speed was increased thtough heating.
A solution to be supersaturated means more solute can still be dissolved in the solvent.
What does a solution being supersaturated mean?A solution is said to be supersaturated if it contains more solute than can effectively dissolve at a certain temperature. The injection of a tiny crystal of solute, known as a seed crystal, can start the recrystallization of the excess dissolved solute in a supersaturated solution.
What does saturated vs supersaturated mean?A saturated solution is one that has dissolved the most solute possible at the temperature specified. A supersaturated solution is one that contains more solute than is necessary to reach saturation.
To know more about saturation :
https://brainly.com/question/28215821
#SPJ9
1. What is the [H3O+] of 0.145M HNO2 ? Assume that the Ka=7.2x10^−4 at 25 ∘C .
Express your answer using two significant figures.
2. What is the pH of 0.145M HNO2 ?
Express your answer using two decimal places.
The concentration of the oxonim ion is 0.0099 M while the pH of the solution is 2.
What is the Ka?The term Ka means the acid dissociation constant. This speaks of the extent to which the acid is able to become dissociated in water. We know that is an acid is able to dissociate completely in water then the acid is a strong acid. However, if the acid is not able to dissociate complete in solution then the acid is a weak acid.
We can now set up the ICE table as we would show below;
HNO2(aq) + H2O (l) ⇔ H3O^+(aq) + NO2^-(aq)
I 0.145 0 0
C -x +x +x
E 0.145 - x x x
Ka = 7.2x10^−4
Ka = [H3O^+] [NO2^-]/[ HNO2]
7.2x10^−4 = x^2/0.145 - x
7.2x10^−4(0.145 - x) = x^2
1.044 * 10^-4 - 7.2x10^−4x = x^2
x^2 + 7.2 * 10^-4x - 1.044 * 10^-4 = 0
x=0.0099 M
Then we know that [H3O^+] = [NO2^-]
Thus;
pH = - log( [H3O^+])
pH = - log(0.0099 M)
pH = 2
Learn more about pH:https://brainly.com/question/15289741
#SPJ1
Fill in the blank.
7.95×10^7 = [?]×10^6
Answer: 79.5
Explanation: Every positive exponent moves the decimal one place to the right. So if you are multiplying by one less decimal to get the same answer your starting number would have to be one place greater to the right.
If your exponents are negative numbers the decimal moves one place per each number to the left. You'll learn that later. Math is a blast! Enjoy it!
How many grams of Fe2O3 can form from 22.4g of O2
74.5 gram of Fe₂O₃ is formed from 22.4 g of O2
The balanced equation of the reaction is
4 Fe + 3 O₂ → 2 Fe₂O₃
4 moles of Fe and 3 moles of O₂ gives 2 moles of Fe₂O₃
Number of moles in 22.4g of O₂ = Given mass / molar mass [Molar mass of O₂ = 32]
= 22.4 / 32
= 0.7 moles
We know that, 3 moles of oxygen form 2 moles of Fe₂O₃
0.7 moles of O₂ form [(2/3) * 0.7] = 0.47 moles of Fe₂O₃
Thus, mass of Fe₂O₃ = number of moles * molar mass [Molar mass of Fe₂O₃ = 159.69]
= 0.47 * 159.69
= 74.5 grams of Fe₂O₃
To know more about Molar mass
https://brainly.com/question/12127540
#SPJ1