Answers
Step 1
It is known that pH and pOH are calculated as follows:
\(\begin{gathered} pH\text{ = - log }\lbrack H3O+\rbrack\text{ \lparen1\rparen} \\ pOH\text{ = - log }\lbrack OH-\rbrack\text{ \lparen2\rparen} \\ Both,\text{ pH and pOH are related to the next equation:} \\ pH\text{ + pOH = 14 \lparen3\rparen} \end{gathered}\)----------------
Step 2
Information provided:
[OH−] = 1.6×10^−2 M (concentration of OH-)
NaOH is a strong base:
NaOH => Na+ + OH-
---------------
Step 3
Procedure:
Firstly, pOH is calculated because it is provided a base:
From (2),
pOH = - log (1.6x10^-2 M) = 1.8
---
Secondly, pH is calculated from (3) as follows:
pH = 14 - pOH = 14 - 1.8 = 12.2
---
Thirdly, [H3O+] is calculated from (1) as follows:
pH = - log [H3O+] => [H3O+] = 10^(-pH) = 10^-12.2 = 6.3x10^-13 M
[H3O+] is calculated from the pH equation as:
\(\begin{gathered} pH\text{ = -log }\lbrack H3O+\rbrack \\ 10^{-pH}=\text{ }\lbrack H3O+\rbrack \end{gathered}\)Answer: [H3O+] = 6.3x10^-13 M
Related Questions
how many calories are in a snack with 175 kj of energy
Answers
Answer:
41826.05 Calories
Explanation:
1 J = 0.239006 Calories
175 KJ
= 175 x 1000 J
= 175000 J
175000 J to Calories
= 175000 x 0.239006
= 41826.05 Calories
Answer: 41.8
Explanation:
Acellus verified ✅
Solve for x
ax + by = 2abx
Please help
Answers
Subtract 2abx from both sides
-2abx+ax+by=0
Subtract BY from both sides
-2abx+ax=-by
Factor out the x
X(-2ab+a)=-by
Divide both sides by -2ab+a
X=-by/-2ab+a
Solar and wind energy are both intermittent resources that cannot be relied upon for a constant stream of energy production. Explain why developing better ways to store energy is an important part of making these energy sources more practical to use.
Answers
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.
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• How do the physical and chemical properties of each packaging type help create new and better product?
Answers
Answer:
chemical composition and physical properties of packaging materials determine their ability to fulfill the various functions expected from the package.
What is the pressure inside a balloon that contains 10.0 g of helium at 25.0°C when the helium occupies a volume of 56.0 L?
A 10.9 atm
B 0.916 atm
C 11.1 atm
D 1.09 atm
Answers
Explanation is in the file
tinyurl.com/wpazsebu
Solid iron is mixed with a solution of copper (I) nitrate to form iron (III) nitrate solution and metal copper. what is the balanced equation?
Answers
HELP!⚠️ I’ll mark you as brainlist.
Caffeine is a bitter stimulate drug and is found in vary quantities. It’s formula is C8H10N4O2. Match the number of moles of each element found
• numbers are 1.2, 2.0, 4.0, 5.0, 8.0, 10, 16, 27
• There are ___ mol of nitrogen in 0.30 mol
• There are ___ mol of hydrogen in 2.7 mol caffeine
• There are ___ mol of carbon in 2.0 mol caffeine
• There are __ mol of oxygen in 2.5 mol of caffeine
Answers
Answer:
• There are 1.8 mol of nitrogen in 0.30 mol of caffeine.
• There are 21.6 mol of hydrogen in 2.7 mol of caffeine.
• There are 16.0 mol of carbon in 2.0 mol of caffeine.
• There are 5.0 mol of oxygen in 2.5 mol of caffeine.
Explanation:
Using this information, we can calculate:
There are 4.8 x 10^23 (1.2 x 4) nitrogen atoms in 0.30 mol of caffeine.
There are 1.62 x 10^24 (2.7 x 6) hydrogen atoms in 2.7 mol of caffeine.
There are 1.6 x 10^24 (2 x 8) carbon atoms in 2.0 mol of caffeine.
There are 2.7 x 10^24 (2.5 x 2 + 8 x 2) oxygen atoms in 2.5 mol of caffeine.
To find the number of moles of each element, we just need to divide the number of atoms by Avogadro's number:
There are 0.8 mol of nitrogen in 0.30 mol of caffeine.
There are 2.7 mol of hydrogen in 2.7 mol of caffeine.
There are 0.2 mol of carbon in 2.0 mol of caffeine.
There are 1.5 mol of oxygen in 2.5 mol of caffeine.
1 Correct the following statement . Alkanol is
common system of naming alcohols in its series.
Answers
Answer:
The common system of naming alcohol in its series is alcohol
For the reaction 2Na + Cl2 2NaCl, calculate the percent yield if
155.0 g of chlorine (Cl2) should be produced and your experiment
produced 143 g (C12).
Answers
Answer:
\(Y=92.25\%\)
Explanation:
Hello there!
In this case, according to the given chemical reaction, it is possible for us to calculate the percent yield by dividing the actual yield of 143 grams of gaseous chlorine by the theoretical yield of 155 g of this gas. In such a way, we proceed as follows:
\(Y=\frac{143g}{155g} *100\%\)
Which has a result of:
\(Y=92.25\%\)
Regards!
Of the waves shown below, which has the most energy?
Answers
Answer:
red it has to be red cuz it is the largest one out of it
Answer:
Apparently its Green
Explanation:
just took the test on A P E X
What is a higland? Help now 50 points
Answers
Answer:
Noun
1. An elevated region; plateau:
He moved to a highland far from the river.
2. highlands, a mountainous region or elevated part of a country.
adjective
3: of, relating to, or characteristic of highlands.
three requirements to start a fire
Answers
(c) What is the volume of 4 kg of water in liters?
Answers
Answer:
\(\huge\boxed{\sf v = 0.004\ m\³}\)
Explanation:
Given Data:Mass = m = 4 kg
Density of water = 1000 kg/m³ (Standard)
Required:Volume = v = ?
Formula:Density = m/v
Solution:1000 = 4 / v
Multiply v to both sides1000 × v = 4
Divide both sides by 1000v = 4/1000
v = 0.004 m³
\(\rule[225]{225}{2}\)
If an equilibrium mixture of the three gases at 600K contains 2.92*10^-2 M COCH(g) and 1.76*10^2 M CO, what is the equilibrium
concentration of Cl2?
Answers
Answer:
C
Explanation:
Please Help! Chemistry Homework
1. A gas has a volume of 1200.0 mL at -50.0 °C and 450 mm Hg. What would the volume of the gas be at 227.0 °C and 1.20 atm of pressure?
2. If a gas at standard temperature occupied 4.20 L at a pressure of 1.3 atm, how much would the volume of the gas be at standard temperature and pressure (STP)?
3. A gas at 20.0°C has a pressure of 0.97 atm. If the temperature increases to 80.0oC, what is the new pressure if the temperature and volume are constant?
Answers
The volume of the gas is 1009 mL
The Volume of the gas is 5.46 L
The pressure of the gas is 1.2 atm
What are the gas laws?The gas laws are a set of fundamental principles that describe the behavior of gases under different conditions, such as temperature, pressure, and volume.
1) Given that;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V2 = P1V1T2/P2T1
V2 = 450 * 1200 * 500/1.2 * 223
V2 = 1009 mL
2)
Since temperature is constant;
P1V1 = P2V2
V2 = P1V1/P2
V2 = 1.3 * 4.2/1
V 2 = 5.46 L
3) P1/T1 = P2/T2
P1T2 = P2T1
P2 = P1T2/T1
P2 = 0.97 * 353/293
P2 = 1.2 atm
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pls help
Which subatomic particle has a neutral charge?
A) electron
B) neutron
C) nucleus
D) proton
Answers
Answer: B
Neutrons are a combination of electrons and protons. They do not have a charge because of this reason. Protons and electrons have positive and negative charges.
Hope it helps!
Charge of calcium atom
Answers
Answer: The calcium ion has a 2+ charge and the phosphate ion has a 3- charge.
Jupiter's mass is more than _________ the mass of the other planets put together.
Answers
Answer:
2.5 times
Explanation:
Jupiter's mass is 2.5 times that of all the other planets in the Solar System combined—this is so massive that its barycenter with the Sun lies beyond the Sun's surface at 1.068 solar radii from the Sun's center.
Explanation: I’ve gotten asked this question in class before
At 25 oC, the rate constant for the first-order decomposition of a pesticide solution is 6.40 x 10-3 min-1. If the starting concentration of pesticide is 0.0314 M, what concentration will remain after 62.0 minutes at 25 oC? 3.12 x 10-2 M 47.4 M 2.11 x 10-2 M 4.67 x 10-2 M 8.72 M
Answers
Answer:
\(2.11\ * 10^{-2}\) is the correct answer to the given question.
Explanation:
Given k=6.40 x 10-3 min-1.
According to the first order reaction .
The concentration of time can be written as
\([\ A\ ]\ = \ [\ A_{0}\ ] * e \ ^\ {-kt}\)
Here \([\ A\ ]_{0}\) = Initial concentration.
So \([\ A\ ]_{0}= 0.0314 M\)
Putting this value into the above equation.
\(0.0314 \ *\ e^{6.40 x 10^{-3} \ * \ 62.0 }\)
=0.211 M
This can be written as
\(=\ 2.11 *\ 10^{-2}\)
6. How many molecules of ammonia are present in 34 g of ammonia (Formula = NH3)?
Answers
After mixing for three hours, the product is extracted into dichloromethane and the solvent is removed to give 245 mg of an oil. Using the moles of our protected aldehyde calculated earlier (2.96) and the molecular weight of the product (102 g/mol) predict the theoretical 100% yield of the product in milligrams. Round to the tenths place.
Answers
Answer:
the theoretical 100% yield of the product in milligrams is 302920 mg
Explanation:
Given the data in the question;
245 mg of an oil
Using the moles of our protected aldehyde calculated earlier (2.96)
the molecular weight of the product (102 g/mol) = 102000 mg/mol
so, the mass of aldehyde produced (100% yield) will be;
⇒ number of moles × molar mass
⇒ 2.96 mol × 102000 mg/mol
⇒ 302920 mol.mg / mol
⇒ 302920 mg
Therefore, the theoretical 100% yield of the product in milligrams is 302920 mg
Chemistry Lab Determination of the Universal Gas Constant (R)
SHOW ALL WORK
Given:
Initial mass of butane lighter: 54.24g
Final Mass of Butane Lighter: 54.01g
Temperature of water: 23.0°C
Volume of gas collected: 100.0mL
FIND:
Barometric pressure of room: 766.86 mmHg CONVERTED TO atm
Vapor pressure of water at room temperature(PH2O) (IN atm)
FIND:
Mass difference if butane lighter in grams
Moles of Butane gas collected in moles of C4H10
Partial pressure if butane gas in atm
Converted temperature of water in Kelvin
Converted volume of gas collected in Liters
Experimental value of R in Latm/molk
Accepted value of R in Latm/molk
Percent error in experimental value of R in %
CONCLUSION QUESTIONS:
1. List at least 3 factors that either did it could contribute to the percent error
2. Should the value of R go up or down if the gas had not been corrected for the partial pressure of water. Why?
3. How could this experiment be repeated to increase the accuracy, or in other words, decrease the percent error?
NOTE: LET ME KNOW IF YOU WANT A PICTURE OF THE LAB INSTRUCTIONS TO HELP SOLVE
ALSO SHOW ALL WORK PLS
Answers
To determine the universal gas constant (R), we can use the ideal gas law equation: PV = nRT, where P is the total pressure, V is the volume of gas, n is the number of moles, R is the universal gas constant, and T is the temperature in Kelvin.
Barometric pressure of the room: To find the barometric pressure in atm, we convert 766.86 mmHg to atm by dividing it by 760 mmHg/atm, giving us 1.0089 atm.Vapor pressure of water at room temperature (PH2O).The vapor pressure of water at 23.0°C is 0.0313 atm.
Mass difference of butane lighter:The mass difference is calculated by subtracting the initial mass (54.24 g) from the final mass (54.01 g), resulting in a difference of 0.23 g.
Moles of butane gas collected:To find the moles of butane gas, we can use the equation n = m/M, where n is the number of moles, m is the mass, and M is the molar mass of butane (58.12 g/mol). Thus, n = 0.23 g / 58.12 g/mol = 0.003959 mol.
Partial pressure of butane gas:The partial pressure of butane gas is calculated by multiplying the moles of butane gas (0.003959 mol) by the ideal gas constant (R) and the converted temperature (23.0°C + 273.15 K). Let's assume the converted temperature is 296.15 K.
Converted volume of gas collected:The volume of gas collected is given as 100.0 mL, which needs to be converted to liters by dividing it by 1000, resulting in 0.1 L.
Experimental value of R:The experimental value of R can be determined by rearranging the ideal gas law equation to solve for R: R = (P - PH2O) * V / (n * T).
Accepted value of R:The accepted value of R is 0.0821 Latm/molK.
The percent error can be calculated using the formula: (|Experimental value - Accepted value| / Accepted value) * 100.
Factors contributing to percent error could include experimental error in mass measurements, inaccurate temperature measurements, and loss of gas during collection or transfer.
If the gas had not been corrected for the partial pressure of water, the value of R would be lower because the partial pressure of water would contribute to the total pressure, resulting in a smaller value for P in the ideal gas law equation.
To increase accuracy and decrease percent error, the experiment could be repeated multiple times to obtain an average value, use more precise measuring instruments, conduct the experiment in a controlled environment, and ensure accurate calibration of equipment.
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Table 1, don’t mind the filled out answers in red(i’m not sure if they’re correct)
Answers
First, these types of reactions are simple displacement reactions.
We must pay attention to the reactivity series. This reactivity series predict if a simple displacement reaction occurs or not.
Zn + HCl
Im gonna give the rest of my points for this
Answers
Answer:
Boiling evaporation and freezing. These happen at different temperatures in all substances for example for water, boiling evaporation happens at 100°C and freezing happens at 0° C
2 NaCl + O₂ -> OCI₂ + 2 Na
If she does the reaction with 56.44 grams of O₂, how many grams of Na are created? answer choices, 162.2, 81.10, or 20.28
PLEASE HELP ME
Answers
100 g of NaCl contains 39.34 g Na and 60.66 g Cl.
What is one gram of sodium?One gram of salt has around 400 milligrams of sodium in it. Adults have a daily limit of 2,300 milligrams of salt, which is little less than six times this value. Children require far less sodium. Furthermore, whereas one sodium atom has an approximate mass of 23 u, one mol of Na atoms has an approximate mass of 23 kg.
We must first convert this figure to the number of moles. As a result, 1.94 moles of Na2O N a 2 O will yield 3.88 moles of NaOH. We must now convert moles to grams. As a result, 155.2 g of NaOH is formed from 120 g of Na2O N a 2 O and excess H2O H 2 O.
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what is the chemical formula for ammonia sulfide
Answers
Answer:
(NH4)2S
Explanation:
What sample at STP has the same number of molecules as 5 L of NO2
Answers
Answer:
5l NO
2
at STP
No. of molecules=
22.4
5
mol=
22.4
5
×N
A
molecules
A) 5ℊ of H
2
(g)
No. of moles=
2
5
mol=
2
5
×N
A
molecules
B) 5l of CH
4
(g)
No. of moles of CH
4
=
22.4
5
mol=
22.4
5
N
A
molecules
C) 5 mol of O
2
=5N
A
O
2
molecules
D) 5×10
23
molecules of CO
2
(g)
Molecules of 5l NO
2
(g) at STP=5l of CH
4
(g) molecules at STP
Therefore, option B is correct.
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Assignment Tools
r
A⟶products
()
(−1)
275
0.379
725
0.676
What two points should be plotted to graphically determine the activation energy of this reaction? To avoid rounding errors, use at least three significant figures in all values.
1=
1=
2=
2=
Determine the rise, run, and slope of the line formed by these points.
rise:
run:
slope:
What is the activation energy of this reaction?
a=
J/mol
Hi. Can you please work this problem out step by step, including the maths. In full detail.
Answers
The activation energy of this reaction is approximately -13.770 J/mol.
1. To graphically determine the activation energy, we need to plot two points. The given data points are:
Point 1: (1, -1.275)
Point 2: (2, 0.379725)
2. The rise is the change in the y-coordinate between the two points:
Rise = y2 - y1 = 0.379725 - (-1.275) = 1.654725
3. The run is the change in the x-coordinate between the two points:
Run = x2 - x1 = 2 - 1 = 1
4. The slope of the line formed by these two points can be calculated using the formula:
Slope = rise / run = 1.654725 / 1 = 1.654725
5. The activation energy (Ea) can be determined using the equation:
Ea = -R * slope
Here, R is the ideal gas constant, which is approximately 8.314 J/(mol·K).
6. Plugging in the values:
Ea = -8.314 * 1.654725 = -13.770 J/mol
Note that the activation energy is negative because it represents the energy difference between the reactants and the transition state (higher energy) in an exothermic reaction.
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Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Answers
Answer:
Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.
Explanation:
The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
Answers
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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