Taking into account the Charles's law, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.
Charles's lawThis law states that the volume is directly proportional to the temperature of the gas: for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.
In summary, Charles' law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Studying two different states, an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Temperature of helium gasIn this case, you know:
V1= 3.1 LT1= 139 C= 412 K (being 0 C= 273 K)V2= 0.71 LT2= ?Replacing in Charles's law:
[tex]\frac{3.1 L}{412 K} =\frac{0.71 L}{T2}[/tex]
Solving:
[tex]\frac{3.1 L}{412 K} T2=0.71 L[/tex]
[tex]T2 =\frac{0.71 L}{\frac{3.1 L}{412 K}}[/tex]
T2= 94.36 K= -178.64 °C
Finally, to 94.36 K or -178.64 °C must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure.
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Justify why sound cannot travel through space.
Answer:
Sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound.
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The compound below is treated with chlorine in the presence of light. Draw the structure for the organic radical species produced by reaction of the compound with a chlorine atom. Assume reaction occurs at the weakest c-h bond.
Explanation:
A carbon radical is a reaction intermediate, which is produced during a free-radical reaction. These carbon radicals contain one unpaired electron on a carbon atom. Hence, these radicals are highly reactive in nature.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate.
What is radical in chemistry?A radical in chemistry is indeed an atom, molecule, and ion that possesses one least one unpaired electron electron. The term "radical" is sometimes used to refer to a free radical. These unpaired electrons provide radicals, with a few exceptions, a high degree of chemical reactivity. Radicals frequently dimerize on their own. The majority of organic radicals have brief lives.
A free-radical reaction results in the production of a carbon radical as a reaction intermediate. One unpaired electron is present on the carbon atom in these radical forms of carbon. As a result, the nature of these radicals is very reactive.
Therefore, a free-radical reaction results in the production of a carbon radical as a reaction intermediate.
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One mole of copper atoms is 6.02 x 1023 copper atoms.
True or false?
Answer:
Explanation:
The relation between molecular (formula) mass and molar mass page 44 . To obtain one mole of copper atoms (6.20 x 1023 ne atoms) weigh out 63.55 g copper. The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance.
Stirring iced tea mix into water is a chemical change?
Answer:
true
Explanation:
it changes the chemicals in the water and adds new ones
1. What happens when an environment reaches its carrying capacity?
A. The population will decrease B. The population will increase
C. The resources will be unlimited
D. Nothing will happen.
Answer: b. population will decrease
Explanation:
since earth only has a finite amount of resources, it could only support a set amount of people. once these sources can no longer be used, the population will decrease because resources can no longer support the population.
Which location represents a period on a periodic table?.
Carbon is the main constituent of hydrocarbons. Why some are called unsaturated hydrocarbon? Briefly describe.
Some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.
What are hydrocarbons?Hydrocarbons are any organic compounds that contain hydrogen and carbon in its structure.
Hydrocarbons can be grouped into the following based on whether they contain single or double bonds:
Saturated hydrocarbons - contain only single bonds e.g. alkanesUnsaturated hydrocarbons - contain double and triple bonds e.g. alkenesTherefore, it can be said that some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.
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Which of the following statements is true?
1. The molar mass of Oz is 48 g/mol
2. A 100-gram sample contains at least 2 moles of Oz
3. 48 grams of O3 contains 6. 02 x 1023 molecules of Oz
The molar mass of Oz is 48 g/mol is true.
What is the molar mass of a substance?Molar mass of a substance is the mass of 1 mole of that substance or it is the number of grams per mole of a substance. The units for molar mass is grams/mole.
Therefore,The molar mass of Oz is 48 g/mol is correct because ozone have three oxygen and the molar mass of one oxygen is 16g/mol.
Ozone= 16×3
Ozone=48g/mol.
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The specific heat capacity of iron 0. 45 j/gk. Find the molar heat capacity for iron
Answer:
The final temperature of the sample is 21.004 °C
Explanation:
The molar heat capacity for iron is 25.130 J/g.c joules per gram per Kelvin.
What is molar heat capacity?The amount of heat needed to increase one temperature of one mole of a substance is called molar heat capacity.
By the formula [tex]\rm \Delta T^\circ c = \Delta Tk[/tex]
Given that c = 0.45 J/g.C
Molar mass of iron is 55.845
Then putting the values in the equation
[tex]c= 0.45 \times 55.845 \\\\c= 25.130 \;J/g.^\circ c[/tex]
Thus, the molar heat capacity for iron is 25.130 J/g.c
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how many molecules are required to produce 15.8 moles of no2
✥ So, in 1.25 moles of NO2, you would have 1.25 moles of N and (2 x 1.25) 2.50 moles of O.
0.1 mole = Avogadro's number of particles (approx. 6.022x10^23 particles/mol)
So, #oxygen atoms = 2.50 mol x 6.022x10^23 atoms/mol
6.022x10^23 atoms/molOr, approximately 1.51x10^24 oxygen atoms.
Hope this answer helps you ✨
) Which direction does thermal energy flow in the following diagram? *
2 points
Heat flows from the ice cream to the hand.
Heat flows from the hand to the ice cream.
The system is too cold for heat to move.
Answer:
the heat flows from the hand to the ice cream
Explanation:
we produce body heat therefore it moves to the ice cream also there is no possible way the heat could move from the ice cream because the ice cream is cold
Heat flows from the hand to the ice cream. Therefore, the correct option is option B among all the given options.
What is thermal energy?When the temperature rises, a type of energy called thermal energy is produced. The amount of thermal energy usually directly inversely proportional to the object's change in temperature. Thermal energy takes the form of heat. The thermal energy of a substance increases with temperature.
The quicker movements of the substance's atoms and molecules are what cause thermal energy to rise as temperature rises. In some cases, a substance's molecules will separate from one another and leave because the temperature has such high. Unexpectedly, thermal energy also affects the states of matter. Heat flows from the hand to the ice cream.
Therefore, the correct option is option B.
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Which images show chemical reactions?
Explanation:
image 3 and 4show chemical reactionsAnswer:
image 3 and 4show chemical reactions
Explanation:
Compared to the nucleus 5626fe, what is the density of the nucleus 112 48cd?
For a comparison of the nucleus 5626fe, the density of the nucleus 112 48cd is mathematically given as the same.
n(Cd) / n(Fe)=1
What is the density of the nucleus 112 48cd?Generally, the equation for the density is mathematically given as
d=\frac{A}{4/3}\piR^3
Therefore
n(Cd) / n(Fe) = [A (Cd) / (A Fe) ] * [ R (Fe) / R (Cd)]^3
n(Cd) / n(Fe)= (112 / 56 ) * (1/1.26)3
n(Cd) / n(Fe)=1
In conclusion, The ratio of n(Cd) = n(Fe) is 1, hence same
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Compared to the nucleus ⁵⁶₂₆Fe, the density of the nucleus ¹¹²₄₈Cd is same.
How do we calculate the density of nucleus?Density of any nucleus will be calculated by using the below equation as:
ρ = m/V, where
m = mass of the atom
V = volume = 4/3πR³
For the given question calculation will be proceed as:
n(Cd) / n(Fe) = [m(Cd)/m(Fe)].[R(Fe)/R(Cd)]³
From the given formulas of iron and cadmuim we put values on the above equation then we get,
n(Cd) / n(Fe) = (112 / 56 ) × (1/1.26)3
n(Cd) / n(Fe) = 1
Hence the density of nucleus ¹¹²₄₈Cd is same as of nucleus ⁵⁶₂₆Fe nucleus.
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How many moles of hydrochloric acid are in 500. Ml of a 0. 300 m solution?.
Answer:
300
Explanation:
because it's not highly concentrated
Consider the reaction 3CH4(g)→C3H8(g)+2H2(g).
Calculate ΔG at 298 K if the reaction mixture consists of 41 atm of CH4 , 0.013 atm of C3H8 , and 2.3×10−2 atm of H2 .
Given:
ΔH for...
CH4 = -74.8 C3H8 = -103.85 H2 = 0
ΔS for...
CH4 = 0.1863 C3H8 = 0.2699 H2 = 0.13058
ΔG for...
CH4 = -50.8 C3H8 = -23.4 H2 = 0
ΔG at 298 K = 128.9 kJ
From the calculations performed, the free energy change for the reaction is 72 kJ/mol.
What is the equilibrium constant?The equilibrium constant is a value that shows the extent to which reactants have been converted to products.
Given that the equation of the reaction is;
3CH4(g)→C3H8(g)+2H2(g)
Then;
PC3H8 = 0.013 atm
PH2 = 2.3×10−2 atm
PCH4 = 41 atm
Now;
ΔG = ΔG° + RTlnQ
ΔG°reaction = ΔG°products - ΔG°reactants
ΔG°reaction = [( -23.4) +2(0)] - 3(-50.8)
ΔG°reaction = 129 kJ/mol
Q = PC3H8 * PH2^2/PCH4^3
Q = 0.013 * (2.3×10−2)^2/( 41)^3
Q = 6.877 * 10^-6/68921
Q= 9.9* 10^-11
Hence;
ΔG = 129 * 10^3 + [8.314 * 298 * (ln 9.9* 10^-11 )]
ΔG = 129 * 10^3 - 57073
ΔG = 72 kJ/mol
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What is the effect Coriolis effect
The Coriolis effect is a natural phenomenon in which objects appear to be deflected as they travel around and above the Earth. The Earth is always rotating, or spinning, from west to east. It completes a full rotation every 24 hours. The Coriolis effect is caused by this rotation.
In the electroplating of nickel, 0. 200 faraday of electrical charge is passed through a solution of niso4. What mass of nickel is deposited?.
The mass of nickel, Ni deposited when 0.2 faraday of electrical charge is passed through a solution of NiSO₄ is 5.9 g
Balanced equationNi²⁺ + 2e —> Ni
Molar mass of Ni = 59 g/mol
Mass of Ni from the balanced equation = 1 × 59 = 59 g
Number of faraday = 2
SUMMARY
From the balanced equation above,
2 faraday deposited 59 g of Nickel
How to determine the mass of nickel depositedFrom the balanced equation above,
2 faraday deposited 59 g of Nickel
Therefore,
0.2 faraday will deposit = (0.2 × 59) / 2 = 5.9 g of Nickel
Thus, 5.9 g of Nickel were deposited in the process
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Answer:
5.9 grams
Explanation:
You need 2 faraday to deposit 1 mole of Ni (59 grams) because there are 2 moles of electrons in equation:
Ni+2 + 2e- --> Ni(s)
So, 0.2 faraday will deposit 1/10 of that or 5.9 grams of Ni(s).
At the top of a hill, an athlete on a skateboard has X joules of mechanical energy. How much mechanical energy will she have at the bottom of the hill? Ignore the effects of friction. X joules less than X joules more than X joules There is not enough information to know.
If an athlete has X joules of mechanical energy at the top of the hill, he will have the same X amount of energy at the bottom of the hill.
What is mechanical energy?Mechanical energy is the addition of kinetic and potential energy. It can be either kinetic or potential energy.
It is the energy possessed by the position or the motion of the body.
It is the energy present to perform any work.
So, the athlete will have X joule of energy at the top and bottom of the hill.
Thus, the correct option is a, X joules.
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Answer:
X Joules
Explanation:
Calculate the volume of 1.5 M nitric acid required to neutralize 30.0 mL of 7.0 M sodium
hydroxide.
HNO3 (aq) + NaOH (aq) → H2O (l) + NaNO3 (aq)
Answer:
0.14 liters nitric acid
Explanation:
Molarity = moles / liter
7.0 M = x / 0.03 L
= 0.21 moles NaOH
0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3
Molarity = moles / liter
1.5 M = 0.21 moles / x
x = 0.21 moles / 1.5 M
x = 0.14 Liters HNO3
Answer:
[tex]140mL[/tex]
Explanation:
[tex]M_1V_1=M_2V_2[/tex]
[tex]M_1=1.5M[/tex] molarity of nitric acid
[tex]V_1=?[/tex] volume of nitric acid
[tex]M_2=7.0M[/tex] molarity of sodium hydroxide
[tex]V_2=30.0mL[/tex] volume of sodium hydroxide
[tex](1.5M)(V_1)=(7.0M)(30.0mL)[/tex]
[tex]V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL[/tex]
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10) How can you find the density of any gas at standard conditions?
Can someone do this fill in the blanks
Answer: aragon is in group 0
2. It’s a non metal
3. Group number
Explanation:
Draw the alkyl bromide(s) you would use in a malonic ester synthesis of ethyl 2-methylbutanoate
The structure of the alkyl bromides used in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate are as drawn in the attached image.
Ethyl 2-methyl-4-pentenoate by Malonic ester synthesis.The malonic ester synthesis is a chemical reaction characterized by the alkylation of diethyl malonate or a similar ester of malonic acid at the carbon alpha (directly adjacent) to both carbonyl groups, and subsequently converted to a substituted acetic acid.
Hence, it follows from the structure of Ethyl 2-methyl-4-pentenoate that the alkyl bromides used are Ethyl bromide and methyl bromide.
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Alkyl bromide is a compound that contains a halogen atom in alkane based structure. The structure of the alkyl bromides is attached in the image below.
What is Malonic ester synthesis?Malonic ester synthesis is the alkylation of an ester of malonic acid or diethyl malonate at alpha carbon and is converted to substituted acetic acid.
In malonic ester synthesis of ethyl 2-methyl butanoate, ethyl bromide and methyl bromide are the alkyl bromides used and their images are attached below.
Therefore, alkyl bromides used in the synthesis are ethyl bromide and methyl bromide.
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SCIENCE help pls need kna
I answered your question in the photo sent
Good luch
Perform the following operation
and express the answer in
scientific notation.
9.2x10^7 ÷ 3.7x10^9
Answer:
coefficient green : 2.4865
exponent (yellow) : 16
Explanation:
How many potassium ions are needed to bond with a phosphate ion?.
Jesse is riding the bus home from school. He is moving away at 30 miles per hour. From which reference point would this description be correct? A. Jesse's home B. the driver of the bus C. the school D. another student on the bus
Answer:
the correct answer is going to be the school
Which ion combines with ba2 to form a compound that is most soluble in water
Answer:
(2) OH- is the answer.
Explanation:
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
The ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
What is barium?Barium is a chemical element with atomic number 58.
Barium reacts with the hydroxide ion to form barium hydroxide. It is also called baryta water.
The reaction is [tex]Ba^2^+ aq + 2OH^- \rightarrow Ba(OH)_2 (aq)[/tex]
Thus, the ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
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A radioactive nucleus emits a beta particle, then the parent and daughter nuclei are
⇢Isotones
⇢Isotopes
⇢Isomers
⇢Isobars
Answer:
isobars
Explanation:
How?
A radioactive nucleus emits beta particle(Like uranium,radium) So the mass numbers are same for daughter nuclei .They have different atomic numbes .So they are isobars
An unknown gas with a mass of 205 g occupies a volume of 20.0 L at 273 K and 1.00 atm. What is the molar mass of this compound?
The molar mass of this compound is 0.004 m/g
Firstly, molar mass is moles/grams so we need to solve for the number of moles and we were already given the grams (205 g).
So to solve for moles we were given 205 g, 20.0 L, 273 K and 1.00 atm. Knowing these numbers we can plug them into the ideal gas law, PV=nRT
where P is pressure, V is volume, n is number of moles, R is the gas constant (in this case it is 0.08206) and T is the temperature.
[tex]PV=nRT\\\\n=\frac{PV}{RT}\\\\n=\frac{1.00*20.0}{0.08206*273} =0.893[/tex]
Next, we use moles and grams to solve for molar mass:
[tex]\frac{0.893}{205} =0.004[/tex]
Two posssible lewis structures for the molecule ch2s are given. determine the formal charge on each atom in both structures
The formal charge on each atom can be known by counting up the number of valence electrons that is present on each atom.
What is Lewis structure?The term Lewis structure is the representation of a compound using its symbols and showing the valence electrons as dots. This question is incomplete as the Lewis structures were not shown.
If it is shown, we can know the formal charge on each atom by counting up the number of valence electrons that is present on each atom.
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