Answer:
180 Torr.
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial temperature (T1) = 127 °C
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 27 °C
Final pressure (P2) =..?
Step 2:
Conversion of celsius temperature to Kelvin temperature.
This is illustrated below:
Temperature (Kelvin) = Temperature (celsius) + 273
T(K) = T(°C) + 273
Initial temperature (T1) = 127 °C
Initial temperature (T1) = 127 °C + 273 = 400 K
Final temperature (T2) = 27 °C
Final temperature (T2) = 27 °C + 273 = 300 K
Step 3:
Determination of the final pressure.
This can be obtained by using the general gas equation as shown below:
Initial temperature (T1) = 400 K
Initial volume (V1) = 400 mL
Initial pressure ( P1) = 120 Torr
Final volume (V2) = 200 mL
Final temperature (T2) = 300 K
Final pressure (P2) =..?
P1V1/T1 = P2V2/T2
120 x 400/400 = P2 x 200/300
120 = P2 x 2/3
Cross multiply
P2 x 2 = 120 x 3
Divide both side by 2
P2 = (120 x 3)/2
P2 = 180 Torr.
Therefore, the new pressure exerted by the gas is 180 Torr.
E ) The distribution coefficient , Ko ( Cether / C water ) , for an organic substance X at room temperature is 13. What relative volume of ether to water should be used for the extraction of 94 percent of X from a water solution in single extraction ?
Answer:
Relative volume of ether to water that should be used for the extraction = 1.205
Explanation:
The extraction/distribution coefficient of an arbitrary solvent to water for a given substance is expressed as the mass concentration of the substance in the arbitrary solvent (C₁) divided by the mass concentration of the substance in water (C₂).
K = (C₁/C₂)
Let the initial mass of the organic substance X in water be 1 g (it could be any mass basically, it is just to select a right basis, since we are basically working with percentages here).
If 94% of the organic substance X is extracted by ether in a single extraction, 0.94 g ends up in ether and 0.06 g of the organic substance X that remains in water.
Let the volume of ether required be x mL.
Let the volume of water required be y mL.
Relative volume of ether to water that should be used for the extraction = (x/y)
Mass concentration of the organic substance X in ether = (0.94/x)
Mass concentration of organic substance X in water = (0.06/y)
The distribution coefficient , Ko (Cether / C water), for an organic substance X at room temperature is 13.
13 = (0.94/x) ÷ (0.06/y)
13 = (0.94/x) × (y/0.06)
13 = (15.667y/x)
(x/y) = (15.667/13) = 1.205
Hope this Helps!!!
Which statement correctly describes a feature of the rock cycle?
PA
Rocks are preserved through the process.
Rocks change from one type to another.
Different rock groups are not related to one another.
Rocks change from one type to another in a specific order.
Answer:
It’s D
Explanation:
Answer:
D Rocks change from one type to another in a specific order.
Explanation:
Will knows that the gravitational pull of Mars is less than the gravitational pull of Earth. When he lands on Mars, his mass will be
Answer:
i think it will "Equal to 75 Kg"
Explanation:
object/person remains same, his mass is somewhere, so it would remain same everywhere. Only Weight of a person changes with gravity
hope i helped
-lvr
A student weighs out a 6.64 g sample of , transfers it to a 500. mL volumetric flask, adds enough water to dissolve it and then adds water to the 500. mL tick mark. What is the molarity of cobalt(II) fluoride in the resulting solution
Answer:
the molarity of cobalt(II) fluoride in the resulting solution is = 0.137 M
Explanation:
Given that :
a student dissolves 6.64 g of CoF₂ into 500 mL of water
volume of the solution(water) = 500 mL = 0.50 L
The standard molar mass of CoF₂ is 96.93 g/mol
number of moles of CoF₂ = mass of CoF₂/molar mass of CoF₂
number of moles of CoF₂ = 6.64 g/96.93 g/mol
number of moles of CoF₂ = 0.0685 mol
The molarity of any given substance is known to be as the number of moles of solute dissolved in one litre of solution.
Thus ;
Molarity of cobalt(II) fluoride CoF₂ in the resulting solution is = number of moles / Volume in (L)
Molarity of cobalt(II) fluoride CoF₂ = 0.0685 mol/ 0.50 L
= 0.137 M
Thus ; the molarity of cobalt(II) fluoride in the resulting solution is = 0.137 M
Balance the chemical equations
Answer:
Explanation:
1). Ca(NO₃)₂ + KI → CaI + K(NO₃)₂
This equation is incorrect.
When Ca⁺⁺ reacts with I⁻, final product is CaI₂
And when K⁺ react with NO₃⁻, final product is KNO₃
Hence the equation will be,
Ca(NO₃)₂ + KI → CaI₂ + KNO₃
Now we have to balance this equation.
Ca(NO₃)₂ + 2KI → CaI₂ + KNO₃
↓
Ca(NO₃)₂ + 2KI → CaI₂ + 2KNO₃
2). Ca(NO₃)₂ + KOH → CaOH + K(NO₃)₂
This equation is incorrect,
Since the reaction of Ca⁺⁺ with OH⁻ gives the final product Ca(OH)₂
And final product of K⁺ and NO₃⁻ is KNO₃
Therefore, the equation will be,
Ca(NO₃)₂ + KOH → Ca(OH)₂ + KNO₃
Now we will balance this equation by changing the coefficients of the molecules until the number of atoms on both the sides become equal.
Ca(NO₃)₂ + KOH → Ca(OH)₂ + 2KNO₃
↓
Ca(NO₃)₂ + 2KOH → Ca(OH)₂ + 2KNO₃
3). Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2Na(NO₃)₂
This equation is incorrect,
Since the reaction of Na⁺ and NO₃⁻ gives the final product NaNO₃.
Therefore, the correct equation will be,
Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃
This equation is in the balanced form.
If a sample of Fe2S3 contains 1.25x10ˣ15 iron atoms what is the mass in grams?
Answer:
mass = 0.00000043189g
How many moles of silver are equivalent to 2.408 x 10^24 atoms
The mole is used to measure small particles like atoms and molecules. The 4 moles of silver is equivalent to [tex]\bold{2.408 x 10^2^4 }[/tex] atoms.
Given here,
The number of atoms
[tex]\bold{2.408 x 10^2^4 }[/tex]
Number of moles = ?
1 mol of substance = [tex]\bold{ 6.02 x10^2^3}[/tex]
Hence,
moles of silver,
[tex]\bold {= \dfrac {2.408 x 10^2^4 } { 6.02 x10^2^3} }}\\\\\bold {= 4 mol}[/tex]
Therefore, the 4 moles of silver is equivalent to [tex]\bold{2.408 x 10^2^4 }[/tex] atoms.
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Which title is most appropriate for this table? ANSWERS: Uses of Functional Groups Involving Oxygen Natural Sources of Functional Groups Involving Oxygen Uses of Functional Groups Involving Halides and Amines Natural Sources of Functional Groups Involving Halides and Amines
Answer:
Uses of Functional Groups Involving Oxygen
Explanation:
From the table given above, we obtained the following:
1. The functional group of each compound contains oxygen.
2. The table shows the uses of each compound.
From the observations made above, we can say that the most appropriate title for the table is:
Uses of Functional Groups Involving Oxygen.
Answer:
A.Explanation:
first guy is right give him brainliest
do you always have to begin with two compounds in a neutralization reaction
Answer:
Yes.
Explanation:
Only an acidic compound and then a basic compound react(neutralization reaction) to give a salt.
Acid+Base=Salt+Water.
Hope this helps❤❤❤
Yes, we always have to begin with two compounds in a neutralization reaction.
What is a neutralization reaction?A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form salt and water as products.
When an acid and a base react, the reaction is called a neutralization reaction. That's because the reaction produces neutral products. Water is always one product, and salt is also produced. Salt is a neutral ionic compound.
Yes, we always have to begin with two compounds in a neutralization reaction.
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Polarity of water. Which is the correct answer?
Tick the correct choice and give reason why you have selected the particular choice. [20] 1. A cup of hot tea is left in the same room as a bowl of ice-cream. What is likely to happen to both after some time, if both are placed on the dining table? A. The tea becomes as cold as ice cream B. The ice cream becomes warmer than the tea C. The tea cools to room temperature, the ice cream melts and warms to room temperature D. The tea becomes colder than before but not as cool as the air in the room
Answer:
C. The tea cools to room temperature, the ice cream melts and warms to room temperature.
Explanation:
The tea's temperature was higher than room temperature. The ice cream's temperature was lower than room temperature. After some time, both items will become room temperature, which results in cooling and melting.
hurry please! avogadro's law relates the volume of a gas to the number of moles of gas when temperature and pressure are constant. according to this law, how many moles of gaseous product would be produced by 2 moles of gaseous reactants if the volume of the gases doubled?
Answer:
Option B. 4 moles of the gaseous product
Explanation:
Data obtained from the question include:
Initial volume (V1) = V
Initial number of mole (n1) = 2 moles
Final volume (V2) = 2V
Final number of mole (n2) =..?
Applying the Avogadro's law equation, we can obtain the number of mole of the gaseous product as follow:
V1/n1 = V2/n2
V/2 = 2V/n2
Cross multiply
V x n2 = 2 x 2V
Divide both side by V
n2 = (2 x 2V)/V
n2 = 2 x 2
n2 = 4 moles
Therefore, 4 moles of the gaseous product were produced.
The combustion of methane is a reaction commonly used in chemistry problems due to its ability to fit into multiple topics. So it should not surprise you to see it here as well. How many L of CO2 would be produced if 45 g of CH4 was combusted with ample oxygen in a room that was 90 degrees Celsius and under 1 atm of pressure
Answer:
20.76 L OF CO2 WILL BE PRODUCED BY 45 G OF METHANE.
Explanation:
Equation of the reaction:
CH4 + 02 --------> CO2 + 2H20
Molar mass of methane = ( 12+ 1*4) g/mol = 16 g/mol
Calculate the number of moles present in 45 g of methane
1 mole of methane = 16 g / mol of methane
(45 / 16) mole of methane = 45 g of methane
= 2.8125 moles
Using the ideal gas equation:
PV = nRT
P = 1 atm
n = 2.812 moles
T = 90 C
R = 0.082 L atm/ mol C
V = unknown
So we have:
V = nRT / P
V = 2.8125 * 0.082 * 90 / 1
V = 20.756 L
In the production of CO2 by 45 g of methane, 20.756 L of methane was used.
Then, the volume of CO2 produced by this volume will be 20.756 L since 1 mole of methane produces 1 mole of CO2.
In other words;
1 mole of CH4 = 1 mole of CO2
22.4 dm3 of CH4 = 22.4 dm3 of CO2
20.76 DM3 = 20.76 dm3
The volume of CO2 produced will therefore be 20.76 L
How many molecules are there in 45 moles of diphosphorus trioxide?
Answer:
[tex]2.71(10^{25})[/tex] molecules
Explanation:
Remember 1 mol is equal to Avogadro's number
[tex]45 mol (\frac{6.02(10^{23}) molecules}{1 mol})[/tex]
Which reaction occurs at the anode of a galvanic cell that has a zinc
electrode in an electrolyte with zinc ions and a copper electrode in an
electrolyte with copper ions? The reduction potential for the reduction of Cu2+
= 0.34 V. The reduction potential for the reduction of Zn2+ = -0.76 V.
A. Zn(s) → Zn2+(aq) + 2e
B. Cu(s) → Cu2+(aq) + 2e
C. Zn2+ (aq) + 2e → Zn(s)
D. Cu2+ (aq) + 2e →
Cu(s)
Answer: The reaction that occurs at anode is [tex]Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-[/tex]
Explanation:
Given : [tex]E^o_{Zn^{2+}/Zn}=-0.76V[/tex]
[tex]E^o_{Cu^{2+}/Cu}=+0.34V[/tex]
The substance having highest positive reduction potential will always get reduced and will undergo reduction reaction. Here, copper will undergo reduction reaction will get reduced.
The substance having highest negative reduction potential will always get oxidised and will undergo oxidation reaction. Here, zinc will undergo oxidation reaction will get oxidised.
Oxidation reaction occurs at anode and reduction reaction occurs at cathode.
Oxidation half reaction (anode) : [tex]Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-[/tex]
Reduction half reaction (cathode) : [tex]Cu^{2+}(aq.)+2e^-\rightarrow Cu(s)[/tex]
Why does carbon form covalent bonds?
Answer:
Carbon has 4 electrons in its outermost shell. ... Therefore, carbon completes its octet by sharing its 4 electrons with other carbon atoms or with atoms of other elements and forms covalent bond. It forms strong covalent bonds because of its small size.
Explanation:
En la electrólisis del Cloruro de plomo se han depositado 2.6 gramos del metal en 20 minutos el peso atómico del plomo es 206 calculo la intensidad de la corriente eléctrica empleada AYUDENNNNN PLISSSS es para hoy!!!!!
Answer:
2.01 A
Explanation:
Para esta pregunta debemos empezar por la semi-reaccion del plomo:
[tex]Pb^+^2~_(_a_q_)~+~2e^-~->~Pb_(_s_)[/tex]
Se intercambian dos electrones en la semi-reacción del plomo. Si tenemos en cuenta la ecuación:
[tex]n=\frac{I*t}{z*F}[/tex]
Donde:
n= Moles depositados
I= Intensidad de corriente (en Amperios)
z= Numero de electrones intercambiados
F= Constante de faraday = 96484 C/mol
t=tiempo (en segundos)
Que conocemos de esta ecuación?
Los moles (se pueden calcular a partir de la masa atómica del plomo, 207.2 g/mol)
[tex]2.6~g~Pb\frac{1~mol~Pb}{207.2~g~Pb}=0.0125~mol~Pb[/tex]
El tiempo (hay que convertirlo a segundos):
[tex]20~min\frac{60~s}{1~min}=1200~s[/tex]
Z (Numero de electrones)
De acuerdo a la semi-reacción son intercambiados 2 electrones.
Por lo tanto podemos resolver para "I":
[tex]I=\frac{n*z*F}{t}=\frac{0.0125~mol*2*96484\frac{C}{mol}}{1200~s}[/tex]
[tex]I~=~2.01~\frac{C}{s}=2.01~A[/tex]
Espero que sea de ayuda!
What is chemical potential energy?
Answer:
Chemical potential energy is the energy stored in the chemical bonds of a substance.
Explanation:
1.825 gm HCl is dissolved in 250 ml solution. What is the pH of that solution? Please answer with the explanation.
The first step is calculating the number of HCl moles. The molar mass of HCl is AH+ACl which is 1+35,5=36,5 g/mole. The formula for the pH is -lg[H+] where [H+] is the molar concentration of protons in the solution. To find the molar concentration we need to divide the number of moles by the volume(L).
We get the number of moles by dividing the mass given in the problem to the molar mass of the compound.1.825/36.5=0.05 moles of HCl so 0.05 moles of
H+.Molarity=n/V=0.05/0.25=0.2moles/liter.The pH is -lg0.2=2.321.
How would you measure the specific latent heat of vaporisation of a liquid?
Answer:
Ramsey and Marshall method.
Explanation:
The specific latent heat of vapourization of a liquid is measured by a modification of the method of Ramsey and Marshall in the year 1896.
why is temperature not a chemical change
Answer:
Temperature is not a chemical change because when a substance changes in temperature, its chemical makeup is not changing.
With carbon dioxide, what phase change takes place when pressure
increases from 1 atm to 10 atm at -40°C?
Carbon Dloxide Phase Diagram
Melting
point
Boling
point
20-
15-
Liquid
Pressure (atm)
10-
Solid
5-
Gas
0
0
00
-100
Temperature (°C)
A. A solid changes to a liquid.
B. A liquid changes to a solid.
O C. A liquid changes to a gas.
D. A gas changes to a liquid.
Answer:B. A liquid changes to a solid.
Explanation:
A Liquid changes to solid when pressure
increases from 1 atm to 10 atm at -40°C
What is the concept for this?The increase in pressure on liquid it forms a solidIf the pressure above the liquid is decreased sufficently, the liquid form a gas How to solve this problem?Here the Freezing point is -78.33°C i.e [-109°F]above this temperature CO2 remains in liquid stateSo, given at -40°C
CO2 will be in liquid state and as per the concept explained above by increasing the pressure on liquid we get the solid state
Thus , With CO2 a liquid phase change to a solid
phase when pressure increases 1 atm to 10atm at -40°C
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which of the following us not a property of salt in the ionic and covalent properties lab
Explanation:
I think Low melting point
because NaCl (salt has mp 801 degC)
Water has mp 0 degC
Using the balanced equation below, how many grams of iron(iii) oxide would be required to make 187g iron Fe2O3+3CO = 2Fe+3CO2
Answer:
267.14 iron oxide.
Explanation:
Given that
[tex]Fe_2O_3+3CO = 2Fe+3CO_2[/tex]
We know that molecular mass of iron-oxide = 160 g/mole.
We know that molecular mass of iron = 56 g/mole.
From the above reaction we can say that
1 mole of iron -oxide produce 2 mole of iron
160 gm of iron oxide produce 112 gm of iron
So
1 gm of iron required [tex]\dfrac{160}{112}=1.42 gm[/tex] of iron oxide
Therefore
187 gm of iron required [tex]1.42\times = 187 = 267.14\ gm[/tex] of iron oxide.
Therefore 187 gm of iron required 267.14 iron oxide.
Answer: 267.14
Explanation:
how many moles of O2 react with .75 moles of c10h22
Answer:
2 moles
Explanation:
why am i blonde.............
Answer:
because your parents carry the recessice gene or they are blond
Explanation:
it could also be ffrom a mutation or just because you dyed your hair
Which statement accurately describes tectonic plate movement? A)Tectonic plate movement can be prevented with planning. B)Tectonic plate movement does not cause environmental change. C)Tectonic plate movement does not affect organisms. D)Tectonic plate movement is a long-term environmental change.
Answer: I wanna say D because pangea was tectonic plates that moved and reshaped the earth
Explanation:
I hope that helps
Answer
D on edge
Explanation:
1. Describe potential long-term and short-term effects of exposure to chemicals.
Answer:
The answer to the question is explained below
Explanation:
A chemical is any substance or an element that can occur naturally or can be created artificially. Chemicals are found in many places like the soil, water, air. They can be found solely as an element without being combined with other elements, and they can also be found as a mixture in compounds.
Exposure to chemicals can be made possible through direct contact with the eye, broken skin. It can also be possible through Inhalation of gases, also through the mouth.
Long-term effects occur when an individual has been exposed to harmful chemicals over a long period of time, with the effect often fatal. Long-term exposure to chemicals include:
1. The weakening of the immune system
2. can cause cancer. For example, Carcinogens that cause cancer in humans, are gotten from exposures to Carbon Tetrachloride, Chloroform.
3. It can cause brain damage
4. It can lead to reproductive disorders
5. It can lead to eye damage, skin problems, and respiratory problems
Short-term effects occur when an individual has been exposed to harmful chemicals accidentally, or within a short period of time. As such, depending on the type of chemical, the amount the individual is exposed to, the effect is usually less fatal and can be addressed. Short-term exposure to chemicals include:
1. Skin or eye irritation
2. Headache
3. Nausea
4. Cough
5. Dizziness
6. Physical injuries
heterogeneous non example
Heterogeneous 'mixtures' (because they don't meet the definition of mixtures) are mixtures substances that aren't completely uniformly spread out. They haven't reacted with the solvent to become a solution.
Explanation: There are 2 types of heterogeneous solutions, A Colloid and a suspension.
Colloid: You can check if a mixture is heterogeneous by passing a light ray through it. This may cause the Tyndall effect (If the mixture is a colloid) when the Colloidal Heterogeneous mixture's particles are so small that they refract the beam of light and the path of light will be visible, like if you add 3 drops of milk in a glass of Water and shine a laser light through it. This is because the particles are too small to be seen by the unaided eye but big enough to scatter you laser light. However that particles won't settle down or will be separated by a filter paper due to particles' small size.
Suspension: A solution will be a solution when the particles of the Mixture is big enough to be seen by the unaided eye. Like if you mix sand and Water, the sand will eventually settle down due to Gravity. The mixture's solute will be big enough to pass through a filter paper.
Which is one way that analyzing ice benefits scientists who study ancient climates? Scientists can analyze frozen volcanic dust to help predict eruptions. Scientists can drill deep into the ice to collect ice cores. Scientists can use pollen grains in ice to make inferences about the climate area. Scientists can study tree rings in ice to learn more about past climates.
Answer:
The correct option is;
Scientists can drill deep into the ice to collect ice cores which contain trapped atmospheric gases
Explanation:
The study of past climates also known as paleoclimatology, is accomplished by acquiring information from proxy data sources which are physical environment characteristics that are preserved through time to remake the conditions of past climate
Past physical environmental characteristics, from which information about ancient climate can be gained are stored in nature's climate variability records including, ice cores, rings in tree stems, fossil pollen, sediments found in the waters of the ocean
The proxy sources provide a means of understanding the conditions of ancient climate before advent of climate measurement.
Therefore, one way that analyzing ice benefits scientists who study ancient climates is that scientists can drill deep into the ice to collect ice cores which contain trapped atmospheric gases from past climates.
Answer: B: Scientists can study the layers of ice cores to gather information about past atmospheric composition.
Explanation: Got it right on a test!