The volume (in liters) the gas occupy if the pressure is increased to 1.30 atm and the temperature is decreased to 15.00 °C is 11.2 liters
How do i determine the new volume of the gas?The following parameters were obtained from the question:
Initial pressure of gas (P₁) = 0.75 atmInitial volume of gas (V₁) = 20.0 LInitial temperature of gas (T₁) = 25.00 °C = 25.00 + 273.15 = 298.15 KNew pressure (P₂) = 1.30 atmNew temperature (T₂) = 15.00 °C = 15.00 + 273.15 = 288.15 KNew volume of gas (V₂) = ?The combined gas equation states as follow:
P₁V₁ / T₁ = P₂V₂ / T₂
Inputting the given parameters, we have
(0.75 × 20) / 298.15 = (1.30 × V₂) / 288.15
Cross multiply
298.15 × 1.30 × V₂ = 0.75 × 20 × 288.15
Divide both side by (298.15 × 1.30)
V₂ = (0.75 × 20 × 288.15) / (298.15 × 1.30)
V₂ = 11.2 liters
Thus, we can conclude that the volume of the gas is 11.2 liters
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Can someone please do this for me? Thank you!!
Answer:
1.) F 2.) F 3.) T 4.) T 5.) T 6.) F 7.) F 8.) F
Explanation:
The four lines observed in the visible emission spectrum of hydrogen gas tell us that: a. The hydrogen molecules they came from have the formula H4 b. Only certain energies are allowed for the electron in a hydrogen atom We could observe more lines if we had a stronger prism C. d. There are four electrons in an excited hydrogen atom The spectrum is continuous
The four lines observed in the visible emission spectrum of hydrogen gas tell us that (b) Only certain energies are allowed for the electron in a hydrogen atom.
The observed lines in the hydrogen spectrum correspond to specific energy transitions of the electron within the hydrogen atom. These transitions occur when the electron moves between different energy levels within the atom. Each line represents a specific energy difference between two energy levels, and the wavelengths of these lines correspond to different colors in the visible spectrum.
The observed spectral lines provide evidence for the quantized nature of energy levels in hydrogen. According to quantum mechanics, electrons in atoms can only occupy certain discrete energy levels. The emission lines in the hydrogen spectrum indicate that the electron in a hydrogen atom can only exist in specific energy states, and it transitions between these states by either emitting or absorbing energy in the form of photons. The other options in your statement are incorrect:
a. The hydrogen molecules they came from have the formula H4: The hydrogen spectrum is related to the behavior of individual hydrogen atoms, not hydrogen molecules. Hydrogen molecules (H2) have different energy levels and do not produce the observed spectral lines.
c. We could observe more lines if we had a stronger prism: The number and position of the spectral lines in the hydrogen spectrum are determined by the energy differences between the electron energy levels. The strength of the prism or the spectroscopic instrument does not affect the number of observed lines. However, a higher-resolution instrument may allow for more precise measurement of the wavelengths of the lines.
d. There are four electrons in an excited hydrogen atom: A hydrogen atom normally contains only one electron. The number of observed spectral lines does not provide information about the total number of electrons in the atom.
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A system gains 732 kJ of heat, resulting in a change in internal energy of the system equal to +196 kJ. How much work is done in kJ?
The work done by the system is +536 kJ.
To determine the work done by the system, we can use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (Q) added to the system minus the work (W) done by the system:
ΔU = Q - W
Given that the change in internal energy (ΔU) is +196 kJ (positive indicates an increase in internal energy) and the heat (Q) added to the system is +732 kJ, we can substitute these values into the equation:
+196 kJ = +732 kJ - W
Rearranging the equation to solve for W:
W = Q - ΔU
W = +732 kJ - (+196 kJ)
W = +732 kJ - 196 kJ
W = +536 kJ
The positive sign indicates that work is done on the system, meaning energy is transferred into the system. In this case, the system gains 732 kJ of heat, and an additional 536 kJ of work is done on the system, resulting in a total increase in internal energy of +196 kJ.
It's important to note that the units for heat, work, and internal energy are all in kilojoules (kJ), which is the standard unit for energy in thermodynamics.
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Explain how an anthropologists uses a regression formula to estimate height
Provide an example with correct calculations
(ignore my tag for it being about chem they don't have forensics science on this site ig)
analyse the effects of the monosubstituents,
Effect of substituents groups -OH, -CI, -NO2, -CH3 on the benzene ring. For each one predict the
position that the attacking species will go to (2, 3 or 4 on the ring) and give the IUPAC name. Including, Whay a particular postion on the rings are favoured
And Percentage yield of isomers formed.
The effects of different monosubstituents (-OH, -Cl, -NO2, -CH3) on a benzene ring can be analyzed in terms of their electron-donating or electron-withdrawing nature and their impact on the reactivity of the ring towards attacking species.
-OH (Hydroxyl group): The -OH group is electron-donating, increasing electron density on the benzene ring. It directs the attacking species to the ortho (2) and para (4) positions. The IUPAC name for the ortho isomer is 2-hydroxybenzene or o-hydroxybenzene.
-Cl (Chlorine atom): The -Cl group is weakly electron-withdrawing, decreasing electron density on the benzene ring. It directs the attacking species to the meta (3) position. The IUPAC name for the meta isomer is 3-chlorobenzene.
-NO2 (Nitro group): The -NO2 group is strongly electron-withdrawing, significantly decreasing electron density on the benzene ring. It directs the attacking species to the meta (3) position. The IUPAC name for the meta isomer is 3-nitrobenzene.
-CH3 (Methyl group): The -CH3 group is weakly electron-donating, increasing electron density on the benzene ring. It does not direct the attacking species to any specific position but rather leads to the formation of a mixture of ortho, meta, and para isomers. The IUPAC name for the methylbenzene isomers are ortho-xylene, meta-xylene, and para-xylene.
Regarding the favored positions, the directing effect is influenced by the electronic nature of the substituents and steric hindrance. Electron-donating groups (such as -OH and -CH3) increase electron density, making the ortho and para positions more favorable.
Electron-withdrawing groups (such as -Cl and -NO2) decrease electron density, making the meta position more favorable.
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2A+2b+2c rate law for this reaction?
Rate =[tex]k[A]^2[B]^2[C]^2[/tex] with an overall reaction order of 6.
The rate law for a chemical reaction expresses the relationship between the rate of the reaction and the concentrations of the reactants. In the given reaction, 2A + 2B + 2C, the general rate law expression can be written as:
Rate =[tex]k[A]^a[B]^b[C]^c[/tex]
However, since the coefficients in the balanced chemical equation represent the stoichiometric coefficients, they can also be used as the exponents in the rate law expression. Therefore, the rate law for the given reaction would be:
Rate =[tex]k[A]^2[B]^2[C]^2[/tex]
Here, a = 2, b = 2, and c = 2 represent the exponents corresponding to the reactants A, B, and C, respectively. The overall order of the reaction is determined by adding the exponents:
Overall reaction order = a + b + c = 2 + 2 + 2 = 6
Hence, the rate law for the reaction 2A + 2B + 2C would be:
Rate =[tex]k[A]^2[B]^2[C]^2[/tex] with an overall reaction order of 6.
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What volume (in mL) of a 0.150 M solution of sodium hydroxide is needed to react
completely with 45 mL of a 0.250 M solution of H₂SO4?
2 NaOH(aq) + H₂SO4(aq) →→→ Na₂SO4(aq) + 2 H₂O(1)
O 5.6 mL
O 37.5 mL
O 150 mL
O22.5 mL
O 11.3 mL
Answer:
150 mL
Explanation:
Recall that
[tex]Molarity = \frac{moles}{volume}[/tex]
Now, we are given a Molarity of 0.250 M H2SO4 with a volume of 45 mL. We will convert this to moles
[tex]mol = \frac{M}{L}[/tex]
Then, since the mole ratio from H2SO4 to NAOH is 1:2, we will multiply by 2
Finally, we will get the volume by dividing by the Molarity of NaOH which is 0.150 M.
The setup for the answer is as follow
[tex](0.25 M H_2SO_4)(45 mL H_2SO_4)(\frac{2 mol NaOH}{1 mol H_2SO_4} )(\frac{1}{0.15MNaOH})[/tex]
The final answer is 0.150 L or 150 mL.
Can someone please do this for me? Thank you!
20. What is the pOH for a solution with a pH of 5.02?
The Carbon-14 content of an ancient piece of wood was found to be one eighth of that in living trees. How old is this piece of wood assuming the half-life of Carbon-14 is 5770 years.
Answer:
its 5770 yrs old
Explanation:
A liquid ester used to flavour food is believed to be impure. What would be the best way of testing its purity?
Answer:
Filter it
Explanation:
How does carbon enter the soil? O used to make shells and bones O dissolves from the atmosphere O decomposition of plant and animal material O photosynthesis converts it into sugars
Photosynthesis is a process by which plants convert light energy into chemical energy which is later used to carry out cellular activities. The carbon enter into the soil through photosynthesis. The correct option is D.
Through the process of photosynthesis, plants assimilate carbon and return some of it to the atmosphere through respiration. The carbon that remains as plant tissue is then used by animals or added to the soil as litter when plants die and decompose.
The carbon dioxide molecules are captured by the plants and are changed into organic matter. The plants keep the carbon and respire the oxygen.
Thus the correct option is D.
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How much heat energy is absorbed when 147 g of ice melts?
Answer in units of kJ.
also
Calculate the energy required to heat 229 g of mercury from 37 ◦C to 42 ◦C. The specific heat capacity of Hg(l) is 0.138 J/g ·◦ C.
Answer in units of cal.
Answer: 49.098 kJ and 37.77 cal
Explanation:
Problem 1
Heat of fusion for water is needed since there is a phase change of water from solid to ice (Heat of fusion is 334 J/g or 0.334 kJ/g).
Q=mL (m is mass and L is latent heat, which in this case is heat of fusion)
Q = 147*0.334 = 49.098 kJ
Problem 2
1 cal = 4.184 J
Q = mcT (m is mass, c is specific heat capacity, and T is change in temperature)
Q = 229*0.138*(42-37) = 229*0.138*5 = 158.01 J
158.01 J = 37.77 cal
30
Task 1 - picture description
1. What kind of picture is it?
2. What does it depict in general?
3. What does it depict precisely?
4. What is the atmosphere in the picture like?
5. Does the picture pose a threat?
6. Have a guess: Where does the pollution depicted in the picture come from?
7. How can people avoid this kind of pollution?
30
8. If you were able to decide what kind of pollution should be stopped immediately, what
would that be?
9. What do YOU de to avoid environmental pollution?
1. We can actually deduce here that the picture is a political cartoon.
2. It actually depicts water pollution.
3. Precisely, it depicts the pollution of the sea water body.
4. The atmosphere looks untidy and smelly.
5. Yes, the picture poses a threat.
What is pollution?The introduction of toxins into the environment that have a negative impact on it is known as pollution. Any substance (solid, liquid, or gas) or energy can cause pollution (such as radioactivity, heat, sound, or light). Both naturally occurring contaminants and imported substances/energies can be considered pollutants, which are the elements of pollution.
6. The pollution depicted in the picture comes from drainage/sewage system.
7. People can avoid this kind of pollution by treating the waste before releasing it into the water body.
8. The pollution that should be stopped immediately is water pollution. This is because it affects human health and leads to the death of aquatic animals.
9. In order to avoid environmental pollution, one will have train and lecture people on ways to dispose waste properly.
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Which of these does not accurated descibe the wright brothers first airplane
Answer:
it had wings that flapped similat to birds wings
d) Would the following molecules be attracted to a magnet? Briefly explain i. B ii. C iii. HCI Tutorial Roo to be handed in Monday 9th May 2022 b 16.00
The field of magnetic materials research and development is frequently reinvented.
Thus, Work on permalloys, ferrites, transport processes, and magnetic resonance in bulk and thin film samples dominated the magnetic material.
Magnetic "bubble films"—perpendicularly magnetized domains that could store and alter information—and the quick advancements in amorphous magnetic alloys drew a lot of attention in the 1970s.
The introduction of Fe-Nd-B permanent magnets and the dramatic acceleration of activity in magnetic thin films and surfaces, as well as continuous advancements in amorphous magnetic alloys, were all seen in the 1980s.
Thus, The field of magnetic materials research and development is frequently reinvented.
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How much heat energy is absorbed when 147 g of ice melts?
Answer:
79.8 cal/g
Explanation:
The molar mass of titanium, Ti, is 47.87 g/mol.
How many moles of titanium are in 104.5 grams of titanium?
Answer:2.18 moles are present in 104.5 gm of titanium
Explanation:
Given: molar mass 47.87 gm/mole of Ti
given: mass =104.5gm of Ti
no of moles =given mass/molar mass
therefore, 104.5/47.87=2.18 moles
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2.18 moles of titanium are present in 104.5 grams of titanium.
The molar mass, also known as the molecular weight, is the mass of one mole of a substance. It is expressed in units of grams per mole (g/mol). The molar mass of a compound can be calculated by summing the atomic masses of all the atoms in its chemical formula.
Given:
The molar mass of titanium (Ti) = 47.87 g/mol
Mass of titanium = 104.5 grams
Convert the mass to moles.
To calculate the number of moles, use the formula:
Number of moles = Mass / Molar mass
Substituting the given values:
Number of moles = 104.5 g / 47.87 g/mol
Performing the calculation:
Number of moles = 2.18 moles
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How many moles of CO are needed to produce 209.7 moles Fe?
We must utilise the chemical formula for the reaction of iron and carbon monoxide to make iron oxide in order to respond to this question. It goes like this: CO + 2 Fe = Fe2O3. Therefore, 1 mole of CO is required for every 2 moles of Fe.
We must multiply the necessary 209.7 moles of Fe by 1/2 to determine the necessary moles of CO. We now have 104.85 moles of CO overall. We may utilise the stoichiometric coefficient for CO, which is 1, to verify our response. It is 1.
Accordingly, 1 mole of Fe2O3 is created for every mole of CO. As a result, 104.85 moles of Fe2O3 are created for every 104.85 moles of CO. because 2 moles If 104.85 moles of Fe2O3 are needed to make 1 mole of Fe2O3, then multiply that figure by two to find the amount of Fe that was created. This provides us the same quantity of Fe that we started with, or 209.7 moles, which supports our conclusion.
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Draw energy diagrams for the following situations:
A slow reaction with a small negative ΔG. Make sure to label all the parts to get the full credit.
To draw an energy diagram for a slow reaction with a small negative ΔG, we will represent the reaction progress on the x-axis and the energy on the y-axis.
The energy diagram consists of the reactants, products, and the energy changes that occur during the reaction.
Reactants: This represents the energy level of the reactants at the start of the reaction.
Activation Energy (Ea): The activation energy represents the minimum energy required for the reactants to overcome in order to undergo the reaction and form products. It is the energy barrier that must be surpassed for the reaction to proceed.
Products: This represents the energy level of the products formed after the reaction.
ΔG: In this case, since the reaction has a small negative ΔG, the energy of the products is slightly lower than the energy of the reactants.
Thus, this can be concluded regarding the given scenario.
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Determine the moles of LiOH produced when 0.38 g of LigN reacts with water according to the following equation.
LigN + 3 H2O --> NH3 + 3 LiOH
To begin addressing this issue, determine how many moles of LigN are contained inside 0.38 g. Given that LigN has a molar mass of 30.02 g/mol, 0.38 g of LigN is equivalent to 0.0126 moles of LigN.
The next step is to calculate how many moles of LiOH are created when 0.0126 moles of LigN react with water using the mole ratio provided by the equation. LigN and LiOH have a mole ratio of 1:3, meaning that when LigN combines with water, 3 moles of LiOH are created.
As a result, 0.0378 moles of LiOH would be created when 0.0126 moles of LigN reacted with water. In conclusion, the reaction between 0.38 g of LigN and water in the 0.0378 moles of LiOH are created using the provided equation.
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How much heat energy is absorbed when 132 g of ice melts
Explanation:
To calculate how much heat energy is absorbed when 132 g of ice melts, we need to know the heat of fusion for ice, which is the energy required to change the ice from solid to liquid without changing its temperature. The heat of fusion of ice is 334 joules per gram. Using this information, we can calculate how much heat energy is absorbed when the ice melts:
q = mass × heat of fusion
q = 132 g × 334 J/g
q = 44,088 J
So, 44,088 joules of heat energy are absorbed when 132 g of ice melts.
If a 300.0 mL sample of a gas is heated at constant pressure from 25.0ºC to 55.0ºC, its new volume is ___ mL?
The new volume of the gas at 55.0ºC is 330.7 mL (rounded to three significant figures).
Assuming the gas behaves ideally, we can use the following formula to calculate the new volume of the gas:
V₂ = V₁ * (T₂/T₁)
Where:
V₁ is the initial volume of the gas at temperature T₁
T₁ is the initial temperature of the gas
V₂ is the new volume of the gas at temperature T₂
T₂ is the final temperature of the gas
We are given:
V₁ = 300.0 mL
T₁ = 25.0ºC = 298.15 K
T₂ = 55.0ºC = 328.15 K
Substituting the values into the formula, we get:
V₂ = 300.0 mL * (328.15 K / 298.15 K)
V₂ = 330.7 mL
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a gas has a volume of 460ml at 500 mmHg. What will be the volume at 1.2 atm?
Answer:
The new volume at 1.2 atm will be 252.23 ml
Identify all the oxidation numbers in the following reaction. Then, identify whether oxidation-reduction has occurred. Finally, justify your answer.
3SO2 + 2HNO3 + 2H2O → 3H2SO4 + 2NO
Oxidation-reduction has occurred in the reaction [tex]3SO_{2}[/tex] + [tex]2HNO_{3}[/tex] + [tex]2H_{2}O[/tex]→ [tex]3H_{2} SO_{4}[/tex] + 2NO
In the reaction [tex]3SO_{2}[/tex] + [tex]2HNO_{3}[/tex] + [tex]2H_{2}O[/tex]→ [tex]3H_{2} SO_{4}[/tex] + 2NO, the oxidation numbers of the elements involved are:
- Sulfur (S) [tex]SO_{2}[/tex] has an oxidation number of +4.
- Nitrogen (N) [tex]HNO_{3}[/tex] has an oxidation number of +5.
- Hydrogen (H) in [tex]HNO_{3}[/tex] and [tex]H_{2}[/tex]O has an oxidation number of +1.
- Oxygen (O) in [tex]SO_{2}[/tex], [tex]HNO_{3}[/tex], and [tex]H_{2}[/tex]O has an oxidation number of -2.
- Sulfur (S) [tex]H_{2}[/tex][tex]SO_{4}[/tex] has an oxidation number of +6.
- Nitrogen (N) in NO has an oxidation number of +2.
To determine whether oxidation-reduction has occurred, we need to compare the oxidation numbers of the elements before and after the reaction. We can see that the oxidation number of sulfur has increased from +4 [tex]SO_{2}[/tex] to +6 [tex]H_{2} SO_{4}[/tex], indicating that it has undergone oxidation. Similarly, the oxidation number of nitrogen has decreased from +5 [tex]HNO_{3}[/tex] to +2 NO, indicating that it has undergone reduction.
Therefore, oxidation-reduction has occurred in the given reaction. The sulfur has been oxidized while the nitrogen has been reduced.
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Which of these is an example of an inherited trait of the plant shown?
Responses
A how it absorbs waterhow it absorbs water
B its need for sunlightits need for sunlight
C how it uses sunlighthow it uses sunlight
D the color of its flower petals
The wave speed of sound waves traveling through four different media were measured at a constant temperature. Results are summarized in the tabl- Based on the data, which medium has the highest density? Medium Wave speed of Sound Unknown A 366 m/s Unknown B 1,433 m/s Unknown C 5,640 m/s Unknown D 6,100 m/s Unknown B Unknown A O Unknown D Unknown C
The wave speed of sound traveling through the four different media, Unknown D has the highest density.
Based on the data provided, we can determine which medium has the highest density by considering the wave speed of sound in each medium. The speed of sound is influenced by the density of the medium it is traveling through. In general, sound waves travel faster in denser media.
The wave speeds for the four unknown media are
Unknown A: 366 m/s
Unknown B: 1,433 m/s
Unknown C: 5,640 m/s
Unknown D: 6,100 m/s
From these values, we can see that sound waves travel the slowest in Unknown A and the fastest in Unknown D. Since sound waves typically travel faster in denser media, we can infer that Unknown D has the highest density among the four media. Conversely, Unknown A has the lowest wave speed, which suggests that it has the lowest density.
In summary, based on the wave speed of sound traveling through the four different media, Unknown D has the highest density.
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Which characteristic of a livable exoplanet does the image below support?
A. The Planet needs have an acceptable temperature for atoms to move.
B. The planets needs to have reliable source of energy.
C. The planet needs to have liquid water available.
D. The planet needs to have an atmosphere to retain heat and reflect solar radiation.
The planet needs to have an atmosphere to retain heat and reflect solar radiation. Option D
Should a planet have an atmosphere to retain heat and reflect solar radiation?A planet's atmosphere can aid in heat retention and solar radiation reflection. Heat is trapped by the atmosphere, which works as a blanket to keep it from escaping into space. The greenhouse effect is a phenomenon that is crucial to preserving the Earth's habitable climate.
However, a planet's capacity to trap heat and reflect solar radiation is not only determined by the presence of an atmosphere.
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How have deep sea creatures adapted to live below the photic zone?
A. Some have large eyes to increase light sensitivity.
B. Some have feelers to replace peripheral vision.
C. Some have slower metabolisms.
D. All of the above
The correct answer is D. All of the above. Deep sea creatures have evolved various adaptations to survive in the extreme conditions of the deep ocean, below the photic zone where light penetration is minimal.
Deep sea creatures have evolved various adaptations to survive in the extreme conditions of the deep ocean, below the photic zone where light penetration is minimal. These adaptations enable them to navigate, find food, and cope with the high pressure and low temperatures. The correct answer is D. All of the above. Some deep-sea creatures have developed large eyes (option A) to maximize light sensitivity. This allows them to detect bioluminescent organisms or faint traces of light in their dark environment. Others have adapted by developing long, sensitive feelers or appendages (option B) that help them navigate and sense their surroundings. In addition, many deep-sea creatures have slower metabolisms (option C) to conserve energy and cope with the limited food availability in the deep ocean. They can survive on scarce food resources and endure long periods of fasting. By combining these adaptations, deep-sea creatures have successfully colonized the depths of the ocean and thrived in an otherwise challenging and inhospitable environment.
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i. red the answers to this chemistry quiz sheet please!
1. decreases.
According to Boyle's Law, the relation between pressure and volume cab be stated as PV = k, where P is the pressure inside the container and V is the volume of the container.
So, pressure and volume are inversely proportional. If volume decreases pressure in the container increases and vice-versa. But this law is obeyed until the temperature and amount of gas remain unchanged.
2. Solids
Only solids are the substances which have fixed volume, changing shape and are not compressible.
3. 22.4 liters
At STP (Standard Temperature and Pressure), one mole of any ideal gas occupies a volume of approximately 22.4 liters.
4. D.
According to the kinetic Molecular Theory, solid's molecules move very quickly with high kinetic energy.
5. direct
Temperature and volume have direct relationship according to ideal gas law equation PV = nRT. We can see that temperature (T) and volume (V) are directly related.
6. Indirect
Pressure and volume have direct relationship according to ideal gas law equation PV = nRT. We can see that Pressure (T) and volume (V) are indirectly related.
7. P1 V1/n1 T1 = P2 V2/n2 T2
As the values V = 0.35 L, T = 18. degree celsius and P = 980 mmHg and constant R = 8.314 J/(mol·K), we can easily find V2 easily.
8. PV = nRT
The ideal gas law equation PV = nRT can be used fing V as the values for P, T, n are given in the problem and R value is a constant.
