Answer: The correct answer is: " 0.54 g " .
__________________________________________
Explanation:
Note that "hydrogen gas" is:
H₂ (g) ; that is: a "diatomic element" (diatomic gas) ;
_________________________________________
The molecular weight of "H" is: 1.00794 g ;
(From the Periodic Table of Elements).
So, the molecular weight of: H₂ (g) is:
" 1.00794 g * 2 = 2.01588 g ; {use calculator) ;
_________________________________________
Note the conversion for a gas at STP:
______
1 mol of a gas = 22.4 L gas;
___
i.e. " 1 mol / 22.4 L " ;
____
So: " 5.7 L H₂ (g) \(* \frac{1 mol H_{2} }{22.4 L} *\frac{2.01588 g}{mol} =? ;\)
The "L" ("literes" cancel out to "1" ; since "L/L = 1 ;
The "mol" (moles) cancel out to "1" ; since "mol/mol = 1 ;
____
and we are left with:
____
[5.7 * 2.104588 g ] / 22.4 = ? g ;
______________________
→ [ 11.9961516 g ] / 22.4 =
0.53554248214 g ;l
_____________________________
We round this value to: " 0.54 g " ;
→ since "5.7 L " has 2 (two) significant figures;
22.4 is an exact number conversion;
and "5.7 L" has fewer significant figures than:
" 2.104588 " ; or: " 1.00794 " .
→ as such: We round to "2 (two) significant figures."
______________________________
Hope this is helpful. Wishing you the best in your academic endeavors!
_______________________________
given the ir spectrum of cyclohexanol and cyclohexane, compare the two spectra; identify the key peaks related to the functional groups of the starting material (cyclohexanol) and the product (cyclohexane). discuss the difference in the ir spectra that supports the formation of the product, cyclohexene.
The comparison of the IR spectra of cyclohexanol and cyclohexane can help identify the key peaks related to their functional groups. The absence of the O-H peak and the appearance of the C=C peak in the IR spectrum of cyclohexene support the formation of the double bond during the dehydration reaction.
Cyclohexanol and cyclohexane are two organic compounds that have distinct infrared spectra. Cyclohexanol is an alcohol with a hydroxyl (-OH) functional group, while cyclohexane is a hydrocarbon with no functional groups.
In the IR spectrum of cyclohexanol, the key peak that is related to the hydroxyl group is a broad, intense peak around 3400 cm-1. This peak is due to the stretching vibration of the O-H bond. Another peak that is present in the spectrum is around 1050 cm-1, which is attributed to the C-O stretching vibration.
On the other hand, the IR spectrum of cyclohexane does not show any peaks related to functional groups. The spectrum is dominated by peaks due to the C-H stretching vibrations. The most intense peaks are observed around 2950 and 2850 cm-1, which are attributed to the symmetric and asymmetric stretching vibrations of the C-H bonds, respectively.
When cyclohexanol is dehydrated to form cyclohexene, the hydroxyl group is eliminated, resulting in the formation of a double bond between two adjacent carbon atoms. This process can be monitored by IR spectroscopy, which can detect changes in the functional groups and the overall molecular structure.
The key difference between the IR spectra of cyclohexanol and cyclohexene is the absence of the O-H peak in the spectrum of the product. Instead, a new peak appears around 1650 cm-1, which is attributed to the C=C stretching vibration of the double bond. This peak is absent in the spectrum of the starting material, indicating that the formation of the double bond has occurred.
In conclusion, the comparison of the IR spectra of cyclohexanol and cyclohexane can help identify the key peaks related to their functional groups. The absence of the O-H peak and the appearance of the C=C peak in the IR spectrum of cyclohexene support the formation of the double bond during the dehydration reaction.
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which of the following is a compound A. Iron B. Alloy C. rock salt D. sugar
Answer:
I think iron sorry if its wrong goodluck!
List several things to remember when in the examination room with the patient and the electronic device that houses the emr system. specifically, what should you do, as the medical assistant, to put the patient at ease
When in the examination room with the patient and the electronic device that houses the EMR system, there are several things to remember to ensure the patient is at ease. Firstly, it is important to introduce yourself and explain your role as a medical assistant.
This can help the patient feel more comfortable and understand that you are there to assist with their care. Secondly, it is important to explain the purpose of the EMR system and how it will be used during the examination. This can help alleviate any concerns the patient may have about their privacy and the security of their information. Thirdly, it is important to ensure that the patient understands that they have control over their information and can request to view or update their records at any time.
This can help the patient feel more empowered and involved in their care. Lastly, it is important to maintain open and honest communication with the patient throughout the examination, and to answer any questions or concerns they may have about the EMR system or their care. This can help build trust and establish a positive rapport with the patient.
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Diminished efficiency of the sodium potassium pump due to hypoxia may be associated with?
Diminished efficiency of the sodium-potassium pump due to hypoxia may be associated with hydropic change
Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal and belongs to group 1 of the periodic table. Its only stable isotope is Na. Free metals do not exist in nature and must be made from compounds.
Summary. Table salt is a combination of two minerals, sodium, and chloride. Your body needs some sodium to function properly. Helps nerves and muscles work. It also helps maintain proper water balance in the body. The kidneys control the amount of sodium in the body.
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How many valence electrons do atoms need to be stable? What is the exception?
what is the stock system name for N2O3, CO, SO3
Answer:
N2O3= Dinitride Trioxide
CO= Carbon Oxide
SO3= Sulfide Trioxide
Explanation:
Di= 2
Tri= 3
Name three things that are matter and why
The initial pressure of a gas is 0. 871 atm with an initial volume of 0. 0467 L and an initial temperature of 266 K. What is the final volume if the pressure changes to 0. 538 atm and the temperature changes to 371 K?
If the pressure changes to 0. 538 atm and the temperature changes to 371 K then the final volume of the gas is 0.0369 L.
Volume in physics is a measurement of the three-dimensional space that a substance or an object occupies. It is a derived number that is defined as the volume in three dimensions that a substance or object takes up. Cubic meters (m3) or cubic centimeters (cm3) are two quantities used to express volume.
We can use the combined gas law to solve this problem.
(P1 × V1)/T1 = (P2 × V2)/T2
where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature.
Substituting the given values, we get:
(0.871 atm × 0.0467 L)/266 K = (0.538 atm × V2)/371 K
Simplifying and solving for V2, we get:
V2 = (0.871 atm × 0.0467 L * 371 K)/(266 K × 0.538 atm) = 0.0369 L
Therefore, the final volume of the gas is 0.0369 L.
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dlaczego emaliowane garnki rdzewieją w miejscach uszkodzenia emalii
Answer:
Explanation: I don’t even know what you said
Answer:
so basically
Explanation:
bsuxnssu hhusnn ji
a disaccharide is formed when two monosaccharide units react via their oh functional groups. the linkage in a disaccharide is
When two monosaccharide units react via their hydroxyl (OH) functional groups, a disaccharide is formed. The linkage between the monosaccharide units in a disaccharide is known as a glycosidic linkage.
The glycosidic linkage is a covalent bond that joins the two monosaccharide units together. It is formed through a dehydration or condensation reaction, where the hydroxyl group from one monosaccharide combines with the hydrogen atom from the other monosaccharide, resulting in the formation of a water molecule. The remaining oxygen atom from each monosaccharide forms the glycosidic bond.
The specific type of glycosidic linkage depends on the orientation of the hydroxyl groups involved in the reaction. Common types of glycosidic linkages include alpha and beta linkages. In an alpha linkage, the hydroxyl group involved in the reaction is positioned below the plane of the ring, while in a beta linkage, the hydroxyl group is positioned above the plane of the ring.
The type and position of the glycosidic linkage in a disaccharide determine its properties and functionality. Different disaccharides, such as sucrose, lactose, and maltose, have distinct glycosidic linkages, resulting in their unique structures and functions.
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What do these floors represent?
Explanation:
What type of floor. You have uploaded no image
6. Which of the following examples describes
a physical change?
Answer:
•Melting of solid ice
• Evaporation of liquid
• Sublimation of solid cheese
since we don’t know the examples I can’t really answer your question but I can say a physical change alters the form or appearance of matter but doesn’t turn any substance in the matter into a different substance once you provide me with the examples I’ll let you know ok
2)
Molarity is defined as the
A)
moles of solute per liter of solution
B)
moles of solute per kilogram of solvent
volume of a solvent
C)
D)
mass of a solution
Answer:
A.moles of solute per liter of solution
Explanation:
the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams.
:-befrank
curved arrows are used to illustrate the flow of electrons. using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction or mechanistic steps. be sure to account for all bond-breaking and bond-making steps.
The electron flow arrow always starts from the nucleophilic center to the electrophilic Centre.
What is nucleophilic ?
The term "nucleophile" refers to an atom or molecule that searches for a positive centre during a chemical reaction, such as the nucleus of an atom, since the nucleophile has an accessible electron pair for bonding.
What is electrophilic ?
An atom or molecule that searches for an atom or molecule that has a pair of free electrons during a chemical process. Lewis acids, which absorb electron pairs, are electrophilic chemicals; many of them are also Brnsted acids (compounds that donate protons).
The electron flow arrow always starts from the nucleophilic center to the electrophilic Centre. The arrow starts from the electrons.
Mechanism with arrows:-
Therefore, The electron flow arrow always starts from the nucleophilic center to the electrophilic Centre.
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The half-life of carbon-14 is 5,730 years. An artifact produces 5.4 disintegrations of 14C per minute per gram of carbon in the sample. Estimate the age of this sample assuming that its original radioactivity was 15.3 disintegrations per minute per gram of carbon.
The estimated age of the sample is approximately 10,717 years.
To estimate the age of the sample, we can use the formula for exponential decay:
\(N(t) = N(0) * (1/2)^(t / T)\)
Where:
N(t) is the current radioactivity (5.4 disintegrations per minute per gram)
N(0) is the original radioactivity (15.3 disintegrations per minute per gram)
t is the time passed (unknown)
T is the half-life of carbon-14 (5,730 years)
Substituting the given values, we have:
\(5.4 = 15.3 * (1/2)^(t / 5730)\)
To solve for t, we need to isolate it. Divide both sides of the equation by 15.3:
\(5.4 / 15.3 = (1/2)^(t / 5730)\)
\(0.3529 = (1/2)^(t / 5730)\)
Next, take the logarithm of both sides to get t / 5730 by itself:
\(log(0.3529) = log((1/2)^(t / 5730))\)
Using the logarithmic property, we can bring down the exponent:
\(log(0.3529) = (t / 5730) * log(1/2)\)
Simplify further:
\(log(0.3529) = (t / 5730) * (-0.3010)\)
Divide both sides by -0.3010:
\(log(0.3529) / -0.3010 = t / 5730\)
Solve for t by multiplying both sides by 5730:
\(t = log(0.3529) / -0.3010 * 5730\)
Using a calculator, we find:
t ≈ 10,717 years
Therefore, the estimated age of the sample is approximately 10,717 years.
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1. how does the increasing of the molarity of solution affect the absorbance readings? briefly explain your observation
As the molarity of a solution increases, the absorbance readings of the solution typically increase.
This is because an increase in molarity generally corresponds to an increase in the concentration of the absorbing species in the solution, which in turn leads to an increase in the number of absorbing particles that can interact with the incident light.
The relationship between absorbance and concentration of a solution is described by the Beer-Lambert law, which states that the absorbance of a solution is proportional to the concentration of the absorbing species and the path length of the light through the solution. Thus, an increase in the concentration of the absorbing species (i.e. the molarity of the solution) leads to an increase in the number of particles that can interact with the light, resulting in a higher absorbance reading.
It's worth noting that this relationship between molarity and absorbance is not always linear, and may depend on the specific properties of the absorbing species and the solvent in which it is dissolved. Additionally, if the concentration of the absorbing species becomes too high, the solution may become opaque and the absorbance readings may no longer be meaningful.
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how is bacteria on mars counted as life but a heartbeat on earth is not?
Use the change of base rule to find the logarithm to four decimal places. log 143.2 O 0.2213 O 4.5186 2.2593 O
0.4771
Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.
To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.
First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.
We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).
Using a calculator, we find that ln(143.2) is approximately 4.9628.
Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.
Finally, we apply the change of base formula:
log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
≈ 4.9628 / 0.4343
≈ 11.4235
Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.
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4. A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of
her walk than in the second 15 minutes,
What can she conclude about her walk?
A she walked over many hills
B
her average speed was faster during the first part of her walk
C. she walked in two different directions
D. she was walking at a constant speed
Find the molarity of a solution made by dissolving 12.5 g sodium carbonate in 500.0 mL total solution
Answer:
The molarity of a solution is "25 M".
Explanation:
The given values are:
Moles of solute,
= 12.5 g
Volume of solution,
= 500 mL
i.e.,
= 0.5 L
Now,
The molarity will be:
= \(\frac{Number \ of \ moles \ of \ solute}{Volume \ of \ solution}\)
On substituting the values, we get
= \(\frac{12.5}{0.5}\)
= \(25 \ M\)
List all elements in periodic table.
# of protons
# of neutrons
# of electrons
# of valence electrons
Solid,gas, liquid
Atomic symbol
Ion charge
Answer ASAP pls
The chemical elements are arranged in rows and columns on what is known as the periodic table, or periodic table of the (chemical) elements.
Thus, It is frequently used in physics, chemistry, and other sciences and is frequently regarded as a symbol of chemistry.
It is a visual representation of the periodic law, which claims that the atomic numbers of chemical elements have a roughly periodic relationship with their attributes.
The table is divided into four blocks that are about rectangular in shape. The table's columns are referred to as groups and its rows are known as periods.
Thus, The chemical elements are arranged in rows and columns on what is known as the periodic table, or periodic table of the (chemical) elements.
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how many moles of oxygen are in 20 grams of oxygen
Answer:
0.625
Explanation:
If you are referring the O2, first you need to get the relative mass of it. You can see the O's is around 16. but this is O2,you need to multiple it.
16×2=32
We get the equation n=m/M where m is for gram
20/32=0.625mol
There are two common isotopes of Hydrogen - 1H, and 2H. How many possible combinations of these isotopes can be found in a Hydrogen molecule (H2)?
An H2 molecule only has three unique isotope combinations.
What are the hydrogen isotopes 2H and 3H?The 3H (or hydrogen-3) isotope is more commonly referred to as tritium than the 2H (or hydrogen-2) isotope. Sometimes, deuterium and tritium are represented by the letters D and T rather than 2H and 3H. Although though this application is widespread, according to the IUPAC, it is not preferred.
Each hydrogen atom in a hydrogen molecule (H2) can either be the 1H isotope (also known as protium) or the 2H isotope (also called deuterium). As a result, each hydrogen atom has two potential isotopes, for a total of 2 2 = 4 possible isotope combinations in an H2 molecule. These four potential pairings are as follows:
Both hydrogen atoms are 1H (H-H)
Both hydrogen atoms are 2H (D-D)
The first hydrogen atom is 1H and the second hydrogen atom is 2H (H-D)
The first hydrogen atom is 2H and the second hydrogen atom is 1H (D-H)
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ii. If the pressure after landing was 1.0 atm, what was the volume of the passenger's collapsed water bottle? (Assume the bottle collapsed easily and temperature didn't change.) (6 points)
Using the ideal gas equation and Gay Lussac's law, the volume of the passenger's collapsed bottle after landing is 0.0075 L.
What is ideal gas equation?The ideal gas equation shows the relationship between temperature, pressure, volume and number of moles.
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Given that;
PV = nRT
P = gas pressureV = volume of gasn = number of moles of gasR = molar gas constantT = temperaturen = PV/RT
Hence:
P = 0.75 atm;
V = 0.5 L;
T = 295 K;
R = 0.082 atmL/K.mol
n = 0.75 * 0.5 / 0.082 * 295
n = 0.015 moles
If the pressure after landing was 1.0 atm;
V1n1 = V2n2
V2= V1n1/n2
V2 = 0.5 L * 0.015 moles/ 1 mole
V2 = 0.0075 L
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Missing parts;
A passenger on an airplane finished a 0.5 L bottle of water during the flight
and replaced the lid. The cabin pressure and temperature were maintained at
0.75 atm and 295 K during the flight. After landing, he noticed his empty water
bottle had collapsed. (12 points)
i. How many moles of gas were in the water bottle?
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for number less than 0.1, such as 0.06, the zeros to the right of the decimal point but before the first nonzero digit
For the number less than 0.1 such as 0.006, the zeroes to the right of the decimal point but before the first non zero digit show the decimal place of the first significant digit.
The number that is given as digits is established using significant figures.Any two non-zero digits that are separated by a zero are significant figure.Every zero that is both to the right and left of a non-zero digit and the decimal point is not significant figure. The quantity of significant figures frequently reveals the degree of measurement accuracy. From the first non-zero digits in the figure, we may determine the number of significant figures.There is only one significant figure in the provided number 0.06. The decimal place of the first digit is indicated by the zeros that appear to the right of the decimal point but before the first non-zero digit.
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What role do stomach enzymes play in digestion? A They transfer food out of the esophagus. B They break down food into smaller parts. C They move food down into the intestines. D They physically mix food with stomach acid.
Answer:
b
Explanation:
Answer:
b
Explanation:
b
quantity of caco3 required to make 100 ml of a 100 ppm ca2 solution
To determine the quantity of CaCO3 required to make 100 mL of a 100 ppm Ca2+ solution, 2.777 mg of CaCO3 is required.
First, calculate the amount of Ca2+ ions required in 100 mL of solution:
(100 mL / 1000 mL) x 100 mg = 10 mg of Ca2+ ions
Next, determine the mass ratio of Ca2+ ions to CaCO3. The molecular weight of Ca2+ is 40.08 g/mol and that of CaCO3 is 100.09 g/mol. Therefore, the mass ratio is 40.08/100.09.
Finally, calculate the amount of CaCO3 required to obtain 10 mg of Ca2+ ions:
(10 mg Ca2+ ions) x (100.09 g CaCO3 / 40.08 g Ca2+) ≈ 2.777 mg of CaCO3
So, 2.777 mg of CaCO3 is required to make 100 mL of a 100 ppm Ca2+ solution.
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At what temperature will 24.6 g Cl2 (g) exert a pressure of 652 mmHg when confined in a 8.5 1 L container?
The temperature at which 24.6 g of chlorine gas, Cl₂ will exert a pressure of 652 mmHg when confined in a 8.5 1 L container is -16 °C
How do I determine the temperature?We'll begin by obtaining the number of mole of chlorine gas, Cl₂ in the container. Details below:
Mass of chlorine gas, Cl₂ = 24.6 gMolar mass of chlorine gas, Cl₂ = 2 × 35.5 = 71 g/molMole of of chlorine gas, Cl₂ =?Mole = mass / molar mass
Mole of of chlorine gas, Cl₂ = 24.6 / 71
Mole of of chlorine gas, Cl₂ = 0.346 mole
Finally, we shall determine the temperature. This is shown below:
Pressure (P) = 652 mmHg = 652 / 760 = 0.858 atmVolume (V) = 8.51 L Mole of of chlorine gas, Cl₂ (n) = 0.346 moleGas constant (R) = 0.0821 atm.L/Kmol Temperature (T) =?PV = nRT
0.858 × 8.51 = 0.346 × 0.0821 × T
Divide both sides by (0.346 × 0.0821)
T = (0.858 × 8.51) / (0.346 × 0.0821)
T = 257 K
Subtract 273 to obtain answer in °C
T = 257 - 273
T = -16 °C
Thus, can conclude that the temperature is -16 °C
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Briefly explain how magnetic behavior is related to the arrangement of valence electrons in the outer orbitals
Answer:
Elements with unpaired valence electrons in the outer orbital are paramagnetic. Elements that are predicted to exhibit paramagnetic behavior may exhibit ferromagnetic behavior. Elements that contain only paired valence electrons are diamagnetic.
If you refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to:
Answer: Revoke the driver's license for at least 12 months
Explanation:
Chemical tests are used in order to measure the amount of drugs or alcohol that is in the body of a person when the person was arrested. To do this, samples of the urine or blood of the person can be taken and the result will be used to know if the person was driving under the influence of alcohol or not.
If the person refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to revoke the the driver's license of the person for at least 12 months.