Answer:
pH = 9.475
Explanation:
Hello there!
In this case, according to the basic ionization of the hydroxylamine:
[tex]HONH_2+H_2O\rightarrow HONH_3^++OH^-[/tex]
The resulting equilibrium expression would be:
[tex]Kb=\frac{[HONH_3^+][OH^-]}{[HONH_2]} =1.1x10^{-8}[/tex]
Thus, we first need to compute the initial concentration of this base by considering its molar mass (33.03 g/mol):
[tex][HONH_2]_0=\frac{1.34g/(33.03g/mol)}{0.500L} =0.0811M[/tex]
Now, we introduce [tex]x[/tex] as the reaction extent which provides the concentration of the hydroxyl ions to subsequently compute the pOH:
[tex]1.1x10^{-8}=\frac{x^2}{0.0811-x}[/tex]
However, since Kb<<<<1, it is possible to solve for [tex]x[/tex] by easily neglecting it on the bottom to obtain:
[tex]x=[OH^-]=\sqrt{1.1x10^{-8}*0.0811}= 2.99x10^{-5}[/tex]
Thus, the pOH is:
[tex]pOH=-log(2.99x10^{-5})=4.525[/tex]
And the pH:
[tex]pH=14-4.525\\\\pH=9.475[/tex]
Regards!
How many molecules are in 87.8 moles of CO2?
Answer:
5.29*10^25 molecules CO₂
Explanation:
Use Avogadro's Number: 6.02*10^23
87.8 mol CO₂ x 6.02*10^23 molecules CO₂/1 mol CO₂ = 5.29*10^25 molecules CO₂
what is the purpose of time on analyzing fluid viscosity
Answer:
Gathering viscosity data on a material gives manufacturers the ability to predict how the material will behave in the real world.
Example:
If toothpaste does not have the correct viscosity, it can either be too difficult to pump out from the tube, or pump out too much.
15 points will mark brainliest
This molecule undergoes a substitution reaction through an SN1 pathway when warmed and stirred with HBr. Draw the two substitution products of this reaction. Show the correct stereochemistry by using wedges and dashes at all chiral centers. In part two, select the term that correctly describes the relationship between the products.
Answer:
See explanation and image attached
Explanation:
The mechanism of this reaction is shown in the image attached. The image was obtained from HomeworkLib.
The first step in the reaction is protonation and loss of -OH2. A carbocation is now created which undergoes a 1,2 hydride shift. This yields a tertiary carbocation which is more stable.
A racemic mixture of two products, major and minor are now obtained as shown.
Which of the following is true according the the Arrhenius theory of acids?
A strong acid increases the OH-ion concentration in an aqueous solution.
A strong acid decreases the OH-ion concentration in an aqueous solution.
O A strong acid decreases the H+ and OH-ion concentration in an aqueous
solution.
A strong acid increases the H+ ion concentration in an aqueous solution.
Most atoms follow the octet rule meaning they need ------ electrons to fill their valence shells. One important exception is H which only needs ------------ electrons to fill its valence shell.
full they blank
Answer:
The octet rule means that atoms need a total of 8 valence electrons to fill their valence shell. Hydrogen only needs two to fill its valence shell.
Explanation:
All atoms except for hydrogen can hold a total of 8 valence electrons in their outer energy levels (2 in the s level, 6 in the p level). Hydrogen only has two electrons total, so it does not require more than the s level and two electrons to have a full valence.
What is the pressure (in atm) in a 5.00 L tank with 9.00 grams of oxygen gas at 350 K?
Answer:
1.61 atm
Explanation:
Using general gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
From the information provided in this question,
V = 5.00L
T = 350K
mass of O2 = 9.00g
Using mole = mass/molar mass
Molar mass of O2 = 16(2) = 32g/mol
mole = 9/32
mole = 0.28mol
Using PV = nRT
P = nRT/V
P = 0.28 × 0.0821 × 350/5
P = 8.0458/5
P = 1.609
Pressure = 1.61 atm
The pressure of the oxygen gas at the given temperature and volume is 1.61 atm.
The given parameters;
volume of the gas, V = 5 Lmass of the oxygen gas, m = 9 gtemperature of the gas, T = 350 KThe number of the moles of the given gas is calculated as follows;
[tex]moles = \frac{m}{M} \\\\moles = \frac{9}{32} \\\\moles = 0.28 \ mol[/tex]
The pressure of the gas is calculated as follows;
[tex]PV = nRT\\\\P = \frac{nRT}{V} \\\\P = \frac{0.28 \times 0.0821 \times 350}{5} \\\\P = 1.61 \ atm[/tex]
Thus, the pressure of the oxygen gas at the given temperature and volume is 1.61 atm.
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A flask with a volume of 1.50 L, provided with a stopcock, contains ethane gas 1C2H62 at 300 K and atmospheric pressure 11.013 * 105 Pa2. The molar mass of ethane is 30.1 g>mol. The system is warmed to a temperature of 550 K, with the stopcock open to the atmosphere. The stopcock is then closed, and the flask is cooled to its original temperature. (a) What is the final pressure of the ethane in the flask
Solution :
Apply ideal gas equation, PV=nRT to find the number of moles.
The number of moles of a gas is
[tex]$n=\frac{P_1V_1}{RT_1}$[/tex]
[tex]$n=\frac{(11.013 \times 10^5\ Pa)(1.50 \times 10^{-3}\ m^3)}{(8.134 \ J/Mole.K)(300 \ K)}$[/tex]
n = 0.66 mole
The initial mass of the ethane in the flask is
m = 0.66 mole x 30.1 g/mole
= 19.866 g
The volume and the number of moles remains constant after the stopcock is closed.
The final pressure of the ethane is
[tex]$p_2=\frac{T_2}{T_1}p_1$[/tex]
[tex]$=\frac{300}{550} \times 11.013 \times 10^5$[/tex]
= [tex]$60.0709 \times 10^4 \ Pa$[/tex]
An antacid tablet weighs 2.10 grams. It requires 45.67 mL of 0.105 M of HCI solution to react completely with the carbonate present in the tablet. Determine the mass of CaCO3 present in the tablet?
Answer:
≅ 0.240 grams (3 sig. figs.)
Explanation:
Rxn: CaCO₃ + 2HCl => CaCl₂ + H₂O + CO₂
Given: ?g 45.67ml(0.105M)
= 0.04567L x 0.105 mole/L
= 0.0048 mole HCl
Rxn ratio for CaCO₃ to HCl is 1:2
∴ moles CaCO₃ consumed = 1/2 of moles HCl used
=> 1/2(0.0048)mole CaCO₃ used = 0.0024 mole CaCO₃
mass CaCO₃ = 0.0024 mole CaCO₃ x 100.09 grams CaCO₃/mole CaCO₃
= 0.23998 grams CaCO₃ (calculator answer)
≅ 0.240 grams (3 sig. figs.)
Ellie started her reaction between the KMnO4 and malonic acid by first heating the two solutions in the hot water bath. She then removed the test tubes from the water bath and poured the KMnO4 into the 75-mL test tube containing the malonic acid. She mixed the solution, placed it back into the water bath, then started the timer. For the data collected at 75 oC, indicate how the process explained above impacts the reaction time.a. The time recorded in the lab notebook is the true reaction time because the reaction only starts after the timer is started b. The time recorded in the lab notebook is longer than the true reaction time because the reaction starts the moment the two solutions were mixed c. The time recorded in the lab notebook is the true reaction time because the reaction only starts after the mixture is placed back into the hot water bath d. The time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed
Answer:
The time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed
Explanation:
A chemical reaction is "a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction" (Oxford dictionary).
A chemical reaction begins immediately the reactants are mixed together in a reaction vessel because the particles of the reactants immediately begin to collide with each other. There is no lost time before reactions begins!
This implies that, the time recorded in the lab notebook is shorter than the true reaction time because the reaction starts the moment the two solutions were mixed.
Answer:
the first one is B. and E. and the second is A., B., and D. on edge 2023
Explanation:
Ecosystems are self-sustaining. They naturally recycle resources without human intervention. Do you think this is true for a pop- bottle biome?
Answer:
yes. For a pop bottle biome to be self sustaining it needs a water cycle, mineral cycle, solar energy flow, and a balance.
Explanation:
hope this helps
Answer:
I would say no because you have to add water and other recourses for it to grow and work
Explanation:
identify two possible reasons for unemployment
Answer:
not sufficient salary and medical reasons
Explanation:
Two possible reasons for unemployment include the following:
Labour demand - supply mismatch.Poor economic growth.What is Unemployment?This is when an individual who is looking for a job doesn't find one and is caused by various factors.
Such factors include poor economic growth in the place of residence or not being qualified to fill vacant positions.
Read more about Unemployment here https://brainly.com/question/305041
can someone help me with this ? i’ll give extra points too :)
Answer:
i believe it is A
Explanation:
when you are doing something (working) you are using up your energy
Question
Does _____ energy.
When you do work on an object, some of your energy is transferred to the object. You can think of work as the transfer of energy. In fact, both work and energy are measured in the same unit, the joule. ... Energy can be transferred from the man to the ball, but the total amount of energy in the system does not change.
Therefore, the answer is ( C ).
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Both the sweatshirt and the balloon are negatively charged. They are most
likely to (blank)
one another.
A-give
B-attract
C-repel
D-help
Answer:
B attract
Explanation:
There will be statication
Does anyone know the answer I need help
Answer:
Can you put other picture because the picture is blurry? please
Explanation:
what is the difference between crystalline and amorphous solid..???
Answer:
Crystalline solids have regular ordered arrays of components held together by uniform intermolecular forces, whereas the components of amorphous solids are not arranged in regular arrays.
Explanation:
describe an example of abiotic conditions and give an example.
Answer:
Abiotic does not mean dead. It means never alive.
Examples of abiotic factors are rocks. weather
Explanation:
because
Which aquatic organism would be least likely to survive in a <7 pH environment?
protozoa
worms
algae
bacteria
How do surface currents differ from deep ocean currents? Deepwater currents are dependent on the wind and landmasses. Deepwater currents are dependent on temperature and salinity. Deep ocean currents are affected by salinity and wind. None of the above
Answer:
surface currents are caused by winds : deep water currents are caused by difference in water density.
I guess the answer of your question is this
Answer:
Deepwater currents are dependent on temperature and salinity.
Explanation:
Choose the larger atom from each of the following pairs.
a. Between Se and Te, the larger atom is __________
b. Between I and Kr, the larger atom is ________
c. Between P and Pb, the larger atom is _______
d. Between Ge and Br, the larger atom is___________
e. Between G e and B r, the larger atom is _________
1. Se
2. Kr
3. S
4. C
Answer:
C, between P and Pb, largest atom is Pb
The larger atom from each of the following pairs is as,
a. Between Se and Te, the larger atom is Te .
b. Between I and Kr, the larger atom is I .
c. Between P and Pb, the larger atom is Pb .
d. Between Ge and Br, the larger atom is Ge .
e. Between G e and B r, the larger atom is Ge .
How atomic size of elements vary in periodic table?In periodic table, on moving from top to bottom in a group the atomic size of elements increases while on moving left to right in a period the atomic size of elements decreases.
To learn more about periodic table here.
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what is the alkane
A.single bond
B.double bond
C.saturated
D.unsaturated
E.A.b
f. non
Answer:
A.Single Bond
Explanation:
hope help's you<3
What is the phase label on H3O+(?)
A. aq
B. s
C. e
D. g
E.
Ammonia and oxygen react to form nitrogen monoxide and water, like this:
Also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition:
Compound pressure at equilibrium
NH_3 65.3 atm
O_2 7.79 atm
NO 12.1 atm
H_2O 65.8 atm
calculate the value of the equilibrium constant Kp for this reaction. Round your answer to 2 significant figures.
Kp=
Answer: The value of the equilibrium constant Kp for this reaction is [tex]3.3\times 10^3[/tex]
Explanation:
Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K
For the given balanced chemical reaction:
[tex]4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)[/tex]
The expression for [tex]K_p[/tex] is written as:
[tex]K_p=\frac{[p_{NO}]^4\times [p_{H_2O}]^6}{[p_{NH_3}]^4\times [p_{O_2}]^5}[/tex]
[tex]K_p=\frac{(12.1)^4\times (65.8)^6}{(65.3)^4\times (7.79)^5}[/tex]
[tex]K_p=3.3\times 10^3[/tex]
The value of the equilibrium constant Kp for this reaction is [tex]3.3\times 10^3[/tex]
Please help. ASAP!
What most likely happens when water loses heat?
It changes into ice.
It changes into vapor.
Its temperature increases.
Its temperature remains constant.
Answer:
It changes into ice.
Explanation:
solid form of water. When water vapor in the atmosphere cools down, it will condense and change back into liquid water, forming clouds
Answer:
It changes into ice,
Explanation:
Because if it's hot it would melt or evaporate, but if it's LOSING heat it would mean the opposite, and the only one that supports this is that "it changes into ice". Hope this helped, sorry i wasn't on for some time
Which of the following is a scientific question about the planet Jupiter?
A. Why is Jupiter a fascinating planet to observe?
B. How often is Jupiter visible in the nighttime sky?
O C. Does the big red spot on Jupiter look like a giant eye?
O D. Why was Jupiter named after a Roman god?
HURRY PLEASE!! Chelsea is expecting a call from her sister in New York at 1:00 p.m. Pacific time. What time will it be in New York when Chelsea's sister calls?
1:00 p.m.
9:00 a.m.
4:00 p.m.
10:00 a.m.
Answer:
it will be 4:00 pm
Explanation:
subtracting eight hours from Coordinated
GIVING BRAINLEST ASAP IM BEING TIMED
Two adaptations to plants are described below:
Adaptation 1: A hornwort is a nonflowering plant that produces a large number of spores instead of seeds.
Adaptation 2: A kangaroo paw has tiny, woolly hairs on it that help it hold onto water droplets.
Which statement is true about these adaptations?
Both are showing adaptations to their physical characteristics.
Both are showing adaptations to their life cycles.
Adaptation 1 is an adaptation to physical characteristics, Adaptation 2 is an adaptation to life cycle.
Adaptation 1 is an adaptation to life cycle, Adaptation 2 is an adaptation to physical characteristics.
Answer:
Adaptation 1 is an adaptation to life cycle, Adaptation 2 is an adaptation to physical characteristics.
Explanation:
Answer:
Adaptation 1: A hornwort is a nonflowering plant that produces a large number of spores instead of seeds
Which of the following compounds is the most stable?
Answer:
Hey mate......
Explanation:
This is ur answer......
fluoridesThus, fluorides are the most stable while iodides are the least stable.
Hope it helps!
Mark me brainliest pls.....
Follow me! :)
Answer:
LICI
Explanation:
a p e x :)
Hard water contains relatively large concentrations of
A. Magnesium ions
B. Calcium ions
C. Iron ions
D. All of these ions
Answer:
I think the answer is All of these ions
What might happen if an endocrine hormone such as thyroid hormone was controlled by positive instead of negative feedback?
Answer:
cdg I will be a little late to the party but I have to go to the store and get ❤️❤️❤️❤️❤️❤️