Answer:
23.48
Explanation:
Good Luck!
Answer: 23.48 g
Explanation:
formula: mass = density x volume
Volume of copper = 2.62 cm^3
Density of copper = 8.96 g/cm^3
mass = 8.96 x 2.62 = 23.4752
The painkiller, Advil® contains the active ingredient ibuprofen (IB), which has a pKb of
5.20. If the pH of a solution containing a dissolved tablet of Advil® was found to be
8.20, what was the equilibrium concentration (mol/L) of ibuprofen?
IB + H2O ⇀ IBH+ + OH−
A) 3.7 × 10−4
B) 5.5 × 10−5
C) 2.8 × 10−7
D) 4.0 × 10−7
E) 9.2 × 10−7
This problem is providing the basic dissociation constant of ibuprofen (IB) as 5.20, its pH as 8.20 and is requiring the equilibrium concentration of the aforementioned drug by giving the chemical equation at equilibrium it takes place. The obtained result turned out to be D) 4.0 × 10−7 M, according to the following work:
First of all, we set up an equilibrium expression for the given chemical equation at equilibrium, in which water is omitted for it is liquid and just aqueous species are allowed to be included:
[tex]Kb=\frac{[IBH^+][OH^-]}{[IB]}[/tex]
Next, we calculate the concentration of hydroxide ions and the Kb due to the fact that both the pH and pKb were given:
[tex]pOH=14-8.20=5.80[/tex]
[tex][OH^-]=10^{-5.8}=1.585x10^{-6}M[/tex]
[tex]Kb=10^{-5.20}=6.31x10^{-6}[/tex]
Then, since the concentration of these ions equal that of the conjugated acid of the ibuprofen (IBH⁺), we can plug in these and the Kb to obtain:
[tex]6.31x10^{-6}=\frac{(1.585x10^{-6})(1.585x10^{-6})}{[IB]}[/tex]
Finally, we solve for the equilibrium concentration of ibuprofen:
[tex][IB]=\frac{(1.585x10^{-6})(1.585x10^{-6})}{6.31x10^{-6}}=4.0x10^{-7}[/tex]
Learn more:
(Weak base equilibrium calculation) https://brainly.com/question/9426156
How many grams of CO2 are produced using 0.29 moles of O2?
The mass of CO2 produced using 0.29 moles of O2 is 12.76 grams.
The reaction between carbon and pxygen atom is exprssed as:
C + O2 -> CO2From he balanced equation, we can see that 1 mole O2 reacted to produce 1 mole of CO2.Hence if 0.29 moles of CO2 was used in the reaction, the number of moles of CO2 produced will be 0.29 moles as well.Mass of CO2 = number of moles * molar mass
Mass of CO2 = 0.29 * (12 + 32)
Mass of CO2 = 0.29 * 44
Mass of CO2 = 12.76grams
Hence the mass of CO2 produced using 0.29 moles of O2 is 12.76 grams.
learn more on stoichiometry here: https://brainly.com/question/16060199
A sample of Ammonia gas at 650mmHg and 15 degree has a mass of 56.8g.calculate the volume occupied by the gas. Take N=14, H=1,R=8.3145jk.
Answer:
The first thing we have to do is change and state all the units so that we can use our ideal gas law equation ([tex]PV = nRT[/tex]).
650 mmHg is a pressure unit, we have to convert this to kiloPascals. We know that 760 mmHg gives us 101 kPa.
[tex]650 \ mmHg \ * \ \frac{101kPa}{760 mmHg} = 86 \ kPa[/tex]
P = 86kPa
T = 15°C + 273K = 288K
R (Gas constant) = 8.31 kj/mol
Molar mass of Ammonia ([tex]NH_{3}[/tex]) = (1 x 3) + (14) = 17g/mol
n (moles) = [tex]\frac{mass}{molar \ mass}[/tex] [tex]= \frac{56.8}{17} =[/tex] 3.34 mol
V = ?
Rearrange the equation to solve for Volume:
[tex]V = \frac{nRT}{P}[/tex]
Substitute the values inside:
V = [tex]\frac{(3.34)(8.31)(288)}{(86)} = 93 L (rounded)[/tex]
Therefore 93 L of volume is occupied by the ammonia gas.
How do carbon atoms form many organic compounds
Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.
a wrong
b wrong
c right
d wrong
Determine the highest occupied energy level in the
following elements:
a. He
b. Be
c. Al
d. Ca
e. Sn
Does pure water conduct electricity? If not, what can we do to make it conduct electricity?.
how much evaporated milk equals 1 cup of whole milk?
Answer:
1/2 cup evaporated milk plus 1/2 cup water.
Explanation:
rank the crystal lattice structures in order of decreasing efficiency of space in the structure.
Rank the crystal lattice structures in order of decreasing efficiency of space in the structure.
1. Simple cubic
2. Body centered cubic
3. Face centered cubic
4. Hexegonal close packed
11. Bacteria and dead cells are removed from circulatory
fluid in the
A) urinary bladder
C) alveoli
B) gallbladder
D) lymph nodes
To solve this we must be knowing each and every concept related to lymph node. Therefore, the correct option is option D among all the given options.
What is lymph nodes?A lymph node, sometimes known as a lymphatic gland, is indeed a kidney-shaped lymphatic and immune system component. The lymphatic veins connect a massive amount of lymph nodes to one another throughout the body.
Most lymph nodes lie within the trunk adjacent to other major structures in the body - such as the paraaortic lymph nodes and the tracheobronchial lymph nodes. The lymphatic drainage patterns are different from person to person and even asymmetrical on each side of the same body. Bacteria and dead cells are removed from circulatory fluid in the lymph nodes.
Therefore, the correct option is option D.
To know more about lymph nodes, here:
https://brainly.com/question/29829253
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Select from the unit conversion factor options below to determine the mass in grams of 1.204 × 1024 atoms of carbon.
1 mol C/ 6.02 x 1023 atoms C, 6.02 x 1023 atoms C / 1 mol C
12 g C / 1 mol, 1 mol / 12 g C
a
12040 g
b
24 g
c
204 g
d
1.99 g
Answer:
option a is the answer
Explanation:
bye bye
Please what the element it is
Answer:
Helium
Explanation:
One electron shell is shown in the model of Helium drawn by Bohr, and it has two electrons inside of it. The atomic number of helium is 2, so the number of protons and electrons that can be used to make its Bohr diagram is the same as its number.
which two observers would be experiencing the same apparent solar time?
The observers which would experience the same apparent solar time are observer B and observer E. This means the correct response as per the full question indicated in the attached document is number 2.
Types of Solar TimeThere are two types of Solar Time. They are:
Apparent Solar Time and Mean Solar TimeWhat is Apparent Solar Time?Apparent solar time refers to the time of the day that is shown by the hour angle of the sun. It is also defined as the sun's position in the sky going by direct observation. Direction observation of the sun to determine Solar Time is possible using a Sundial.
See the link below for more about Apparent Solar Time:
https://brainly.com/question/6336054
Helpp you will get a brainly
HC= Hydrocarbon
CH=benzene
Explanation:
HC is Hydrocarbon, how? -- Hydrocarbon, a category of substances consisting only of hydrogen and carbon.
CH is benzene, how? -- benzene is represented by the empirical formula CH, which indicates that a typical sample of the compound contains one atom of carbon (C) to one atom of hydrogen (H).
----(Is this what you meant???)
!!!SOMEONE HELP !!!
PLEASE
Answer:
use other websites u might have luck and find ur anwer
Explanation:
(
−
5
2
)
−
1
(
−
5
+
1
)
=
24
−
4
=
−
6
(−5+1)
(−5
2
)−1
=
−4
24
=−6
if a substance has a normal boiling point of 50 °c, what can you state about the vapor pressure of the same substance at 40 0 °c?
PLEASE HELP I AM FAILING
Answer:
160.3 g S
Explanation: there you go
True or false: The
louder you yell into a
megaphone in space,
the more likely it is for
the sound waves to
travel.
Answer:
True
Explanation:
This is known as a lapse rate. When you shout something to someone across the lake, the sound waves near the surface end up moving faster than the sound waves higher up. Since the speed is greatest near the ground, sound waves bend upward, causing the audio to be just out of ears reach.
How many sig figs are in 6.0395? Please no links-
Answer:
5 significant figures
Explanation:
The zeros as considered when they are in between or after numbers greater than zero.
Ex1: 0.005 = 1 significant figure
Ex2: 0.0050 = 2 significant figure
Ex3: 0.05500= 4 significant figure
Ex4: 5.00 = 1 significant figure
Give one example of how environmental factor could influence the way a gene is expressed.
Answer:
The presence of drugs or chemicals in an organisms environment can also influence gene expression in the orgains.
Pb2O4 has a ratio of 2:4. It needs to be reduced to?
A.) 1:0
B.) 2:0
C.) 1:2
D.) 2:2
Answer:
C
Explanation:
The reason why is because if you divide 2 by 2 you get 1 and 4 divided by 2 is 2. Hope this helps .
Read the following chemical equations.
Reaction 1: 2KI + H2O2 2KOH + 12
Reaction 2: Cl2 + H2 → 2HCI
Which of the following statements is true for both the chemical equations?
A. I is oxidized in reaction 1 and Cl2 is oxidized in reaction 2.
B. I is reduced in reaction 1 and Cl2 is reduced in reaction 2.
C. I is oxidized in reaction 1 and Cl2 is reduced in reaction 2.
D. I is reduced in reaction 1 and Cl2 is oxidized in reaction 2.
This problem is providing two reduction-oxidation (redox) reactions in which the oxidized and reduced species can be identified by firstly setting the oxidation number of each element:
Reaction 1: 2K⁺I⁻ + H₂⁺O₂⁻ ⇒2K⁺O⁻²H⁺ + I₂⁰
Reaction 2: Cl₂⁰ + H₂⁰ ⇒ 2H⁺CI⁻
Next, we can see that iodine is being oxidized and oxygen reduced in reaction #1 and chlorine is being reduced and hydrogen oxidized in reaction #2 because the oxidized species increase the oxidation number whereas the reduced ones decrease it.
In such a way, the correct choice is C.
Learn more:
(Redox reactions) https://brainly.com/question/13978139why is oxygen more electronegative than hydrogen
Answer:
The attraction of the Oxygen for an electron as measured by the electronegativity of Oxygen is 3.5 which is higher than the electronegativity of Hydrogen at 2.2
Explanation:
NO LINKS!!!
Help . . .
Where is the magnetic field strongest?
A. closest to the wire
B. Farthest from the wire
Answer:
In general, the magnetic field is strongest close to the wire and weaker farther away. In fact, the magnetic field weakens as 1/r1/r where rr is the distance from the wire. This can change a bit depending on the length and shape of the wire. Far enough away, the magnetic field decays as 1/r21/r2 .
Answer:
Closest to the wire
Explanation:
In general, the magnetic field is strongest close to the wire and weaker farther away. In fact, the magnetic field weakens as where is the distance from the wire. This can change a bit depending on the length and shape of the wire.
Types of Reaction
A) Synthesis
B) Decomposition
C) Single displacement
D) Double displacement
E) Combustion
F - Synthesis
G - Single Displacement
H - Combustion
I - Double Displacement
Hope it helps :)
True or False? The energy carried by a sound
wave is blocked by collisition
between the particles in the
material the name is traveling
in
Answer:
true
Explanation:
i checked on moogle
Give an example for the neutralisation between a strong acid and a weak base, also mention the nature of its salt.
need help !! ~~~~
Answer:
Neutralization occurs when a strong acid and a strong base come together in a chemical reaction to form water and salt.
Explanation:
not sure huhuhu
You are studying the boiling points of liquids with some fellow students. You have two liquids of different molecular weights, and you test each of them twice. You find that the one with a lower molecular weight also has a lower boiling point. You would like to be more confident with the pattern you are noticing. What are two possible next steps? In one to two sentences, give specific, different examples of how the experiment could be extended, assessed, or improved.
The boiling points of two or three other pairs of liquids in which one liquid has a lower molecular mass than the other can be studied in order to see if the pattern is consistent.
The boiling point of a substance refers to the temperature at which its vapor pressure is equal to the atmospheric pressure. The boiling point of a substance has a lot to do with its molecular mass.
Generally, substances that has a higher molecular mass has a higher boiling point except other factors at at work. In order to confirm whether the pattern that you are noticing about molecular weights and boiling point is consistent, three other liquids with different molecular masses, one being higher than the other can be studied and their boiling points compared.
Learn more about boiling points: https://brainly.com/question/2153588
select the best explanation for why methanol, ch3oh, cannot be used as a solvent for the deprotonation of a terminal alkyne by sodium amide, nanh2.
Answer:
d. Methanol is more acidic than the alkyne and will be deprotonated instead.
Explanation:
because acidity is the ability to lose H+, leaving an anion behind; acidity depends on the stability of the anion.
Oxygen is produced by the reaction of sodium peroxide, Na2O2 , and water.
2 Na2O2 (s) + 2 H2O(l) ---> O2(g) + 4 NaOH(aq)
Calculate the mass of Na2O2 in grams needed to form 5.20 g of oxygen.
Answer: 23.53g
Explanation:
5.2/(2x16) = 0.1625 mol
0.1625 x 2 = 0.325 mol
0.325 x (23 x 2 + 16 x 2) = 78 x 0.325 = 23.53g
Sources of error in colorimetry?