Answer: 9.91×10²³ particles
Explanation:
To find the amount of particles, you will need to use the Ideal Gas Law with what we are given.
Ideal Gas Law: PV=nRT
After we find moles, we can use Avogadro's number to convert to particles.
[tex]n=\frac{PV}{RT}[/tex]
P=101.3kPa=1.00 atm
V=4.0 L
T=23°C+273.15=296.15 K
R=0.08206 Latm/Kmol
[tex]n=\frac{(1.00 atm)(4.0 L)}{(0.08206Latm/Kmol)(296.15K)}[/tex]
[tex]n=0.164595 mol[/tex]
Now that we have moles, we can convert to particles.
[tex]0.164595mol*\frac{6.022*10^2^3 particles}{mol} =9.91*10^2^2 particles[/tex]
A 13.5g sample of gold is heated, then placed in a calorimeter containing 60g of water. The temperature of water increases from 19oC to 20oC. The specific heat of gold is 0.13J/goC. What was the initial temperature of the gold metal sample?
Answer:
[tex]T_i~=163.1[/tex] ºC
Explanation:
We have to start with the variables of the problem:
Mass of water = 60 g
Mass of gold = 13.5 g
Initial temperature of water= 19 ºC
Final temperature of water= 20 ºC
Initial temperature of gold= Unknow
Final temperature of gold= 20 ºC
Specific heat of gold = 0.13J/gºC
Specific heat of water = 4.186 J/g°C
Now if we remember the heat equation:
[tex]Q_H_2_O=m_H_2_O*Cp_H_2_O*deltaT[/tex]
[tex]Q_A_u=m_A_u*Cp_A_u*deltaT[/tex]
We can relate these equations if we take into account that all heat of gold is transfer to the water, so:
[tex]m_H_2_O*Cp_H_2_O*deltaT=~-~m_A_u*Cp_A_u*deltaT[/tex]
Now we can put the values into the equation:
[tex]60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C=-(13.5~g*0.13~J/g{\circ}C*(20-T_i)~{\circ}C)[/tex]
Now we can solve for the initial temperature of gold, so:
[tex]T_i~=(\frac{60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C}{13.5~g*0.13~J/g{\circ}C})+20[/tex]
[tex]T_i~=163.1[/tex] ºC
I hope it helps!
Taking into account the definition of calorimetry, the initial temperature of the gold metal sample is 163.36 °C.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
For gold:Mass of gold = 13.5 gInitial temperature of gold= Unknown Final temperature of gold= 20 ºC Specific heat of gold = 0.13 [tex]\frac{J}{gC}[/tex]For water:Mass of water = 60 g Initial temperature of water= 19 ºC Final temperature of water= 20 ºC Specific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgold= 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgold = + Qwater
- 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)
Solving:
- 1.755 [tex]\frac{J}{C}[/tex]× (20 C - Initial temperature of gold)= 251.16 J
- 1.755 [tex]\frac{J}{C}[/tex]× 20 C - (- 1.755 [tex]\frac{J}{C}[/tex])× Initial temperature of gold= 251.16 J
- 35.1 J +1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J
1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J + 35.1 J
1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold=286.7 J
Initial temperature of gold=286.7 J÷ 1.755 [tex]\frac{J}{C}[/tex]
Initial temperature of gold= 163.36 °C
Finally, the initial temperature of the gold metal sample is 163.36 °C.
Learn more:
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Describe the specific numbers measured and calculated. Restate the hypothesis and explain whether it was supported by
the data. Provide an example from the lab.
Answer:
To get from DNA, written in one chemical language, to protein, written in another, requires two major stages, transcription and translation.
Explanation:
I hope This Helps ^^!!! あなたの歓迎
Please answer question 2.
1. What happens when you stir a spoonful of sugar into hot water?
2. When sugar or another substance is dissolved in water, it disappears from view and forms a homogeneous mixture with the water, also called a solution.
If you can’t see the sugar, how can you tell that it is there?
Answer:
The water tastes sweet, and it usually appears to be cloudy or not clear.
Explanation:
If nothing dissolves into the water, then it should be clear.
Answer:You can tell if the sugar is still there by boiling off the water and leaving the sugar behind in the container. Sugar is a solid, and therefore cannot evaporate, so when the water reaches boiling point, it will evaporate at a quicker rate than before (water evaporates at any temperature in liquid form; just not enough to be noticeable) and leave the container to become water vapour
Explanation: If you stir a spoonful of sugar into hot water, the sugar will dissolve in the hot water. When sugar or another substance is dissolved in water, it disappears from view and forms a homogeneous mixture with the water, also called a solution.
Please help, and solve the problem in kJ
Answer:
1. Exothermic.
2. Yes, released.
3. 38.65KJ of heat is released.
Explanation:
The equation for the reaction is given below:
2NO2 —> N2O4...... ΔH = –55.3KJ
1. The sign of the enthalpy change, ΔH tells whether the reaction is endothermic or exothermic. Since the sign of the enthalpy change, ΔH is negative, the reaction is exothermic.
2. The negative sign indicate that heat is released to the surrounding. Since the reaction is generally an exothermic reaction, 64.3g of NO2 will also release heat to the surroundings.
3. Molar mass of NO2 = 14 + (16x2) = 46g/mol
Mass of NO2 from the balanced equation = 2 x 46 = 92g.
From the balanced equation above:
92g of NO2 reacted to release –55.3KJ of heat.
Therefore, 64.3g of NO2 will react to release = (64.3 x –55.3)/92 = 38.65KJ of heat.
Therefore, 38.65KJ of heat is released.
On which side of the periodic table are there alkaline metals?
Please help! I will give brainliest!
Answer:
left/center
Explanation:
Metals including, alkali metals, alkaline earth metals, and transition metals are all located on the left/center.
hope I helped!
Question 12
2 pts
A gas is initially at STP. When heated to 25°C what will the pressure be in atmospheres
assuming constant volume and moles?
Answer:
Pressure initially is 760 torr.
Temperature is at 273.15
Temperature is increased to 298.15
Pressure increases by a factor of 298.15 / 273.15 = 1.0915248032
760 * 1.0915248032 = 829.558850432 torr
Explanation:
A student caries out an experiment and dissolves 10.0 g of sodium bromide. NaBr, in 200g of water. What is the molality of the solution?
Answer:
0.485mol/kg
Explanation:
Molality is defined as the ratio of the number of moles of a solute to the kilogram of a solvent which is usually water.
Mass of NaBr = 10g
Molar mass of NaBr= 23+80=103g/mol
Mole of NaBr = mass / molar mass=10g/103g/mol= 0.097mol
Molality= Mole of a solute/ mass of solvent in kg
Mole of a solute( NaBr)= 0.097mol; mass of solvent( water in kg)= 200g. To convert to kg: 200g/1000g= 0.2kg
Molality = 0.097mol/0.2kg = 0.485mol/kg
If you spilled nails in a sand box what separation tool/method could you use to clean out the sandbox so it would be safe for children to play with it's:filter,screen,magnet,Evaporation
Answer: Magnet
Explanation:Using a magnet is the best separating technique to be deployed in this case. The nails are easily picked out by just holding a magnet over the sandbox.
What mass of hydrogen is produced from the reaction of 50.0 g of Mg and 75.0 g of HCl? How much of the excess reagent is left over?
Mg + 2HCl → MgCl2 + H2
colloidal solution show tyndall effect but true solution do not explain
Answer:
Scattering of light through a solution when light passes through it is called Tyndall effect.
In a colloidal solution, the particle size is between 1 nm to 100 nm, when light rays fall on colloidal solution, these particles sizes allow scattering of light ray.
But in true solution the size of particles is smaller than 1nm and unable to scatter the light and do not show tyndall effect.
Hence, colloidal solution shows tyndall effect but true solution do not.
If 10.0 liters of h2(g) at STP is heated to a temperature of 546 K, pressure remaining constant, the new volume of the gas will be
Answer:
20L
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 10L
Initial Temperature (T1) = stp = 273K
Final temperature (T2) = 546K
Final volume (V2) =..?
The new volume of the gas can be obtained by using the Charles' law equation as shown below:
V1/T1 = V2/T2
10/273 = V2/546
Cross multiply to express in linear form
273 x V2 = 10 x 546
Divide both side by 273
V2 = (10 x 546) / 273
V2 = 20L
Therefore, the new volume of the gas is 20L.
What is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge?
nuclide
proton
electron
isotope.
proton is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge.
Existe una especie de pájaro en las islas Galápagos que puede ejercer una fuerza de 205N (Newton) con un pico para romper una semilla. Si su pico se desplazó 0,004m durante esta operación, ¿cuánto trabajo realiza el pájaro para conseguir la semilla? Ayuda por favor
Answer:
In order to calculate the work that the spike did, you have to respect the following equation:
WORK = FORCE X DISPLACEMENT X COS (0)
Explanation:
Work is measured in joules, and is the amount of energy a body needs to make a certain force over a certain distance.
In the case of this bird we would be calculating with the equation written up in the previous item the work that said animal would do to grind a seed.
Which of the following statements is true about cellular respiration?
It converts energy into food,
It breaks down food to release energy,
It turns carbon dioxide into water.
It tums water into carbon dioxide.
Answer:
It breaks down food to create energy
Consider the nuclear equation below. 239/94 Pu—-> X+ 4/2 He. What is X?
Answer:
X = U (Uranium)
Explanation:
Pu-->235/92 U + 4/2 He
The element X which is involved in the given nuclear reaction is ²³⁵₉₂U.
What is radio active decay?Radio active decay is a process in which an unstable nuclei will emit some particles from the nuclei in the form of energy to get stability.
In the given chemical reaction, parent nuclei (²³⁹₉₄Pu) will emit the alpha particle (⁴₂He) which has a atomic number 2 and atomic mass of 4 as a result of which we get a daughter nuclei Uranium which will get the atomic number 92 and atomic mass of 235.
²³⁹₉₄Pu → ⁴₂He + ²³⁵₉₂U
Hence the element X is uranium (²³⁵₉₂U).
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Oxidation number of sulphur in H2SO4
Answer
let the oxidation of sulphur is x
2(+1)+x+4(-2)=0
+2+x-8=0
+2-8+x=0
-6+x=0
x=6
Explanation:
i hope this will help you:)
3) List two other names for P-waves and for S-waves.
4) How many earthquake recording stations are needed to locate an earthquake
epicenter? What would happen if you only had two stations? Explain and
illustrate the difference.
If I were to draw an electron configuration for a bromine (Br) atom, what is the highest energy level I would reach?
3s
3p
4s
4p
Answer:
4p
Explanation:
3s < 3p < 4s < 4p
This arrangement is in order of increasing energy.
This explains that, 4p is the highest energy level you can reach.
Which hydrocarbon has more than one possible structural formula?
Answer:
An alkane is a hydrocarbon in which there are only single covalent bonds. The simplest alkane is methane, with the molecular formula CH4.
Explanation:
Alkanes.
Name Heptane
Molecular Formula C7H16
Condensed Structural Formula CH3CH2CH2CH2CH2CH2CH3
Boiling Point (°C) 98.5
Hydrocarbons which are alkanes with 4 or more than 4 carbon atoms have more than one possible structural formula which is a type of chemical formula.
What is structural formula?Structural formula helps in identifying location of chemical bonds which are present between atoms in a molecule.It consists of symbols of elements for the atoms which are connected by short lines which actually represent the chemical bonds.
Structural formulae can be deduced from molecular formulae the fragment ions are studied in the mass spectrum.It is concerned with the valency which helps in determination of of how atoms a combine in a definite ratio.
Properties of molecules are much related with their structures. It helps in showing the arrangement of atoms in a three-dimensional space.
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Where is aggregate generally found?
Answer:
They are generally found in mines
The parts that are either directly or indirectly related to each other in a system are known as what?
A) the flow
B) the boundary
C) the components
D) the input
Answer:
C) the components
Explanation:
The term component is referred to as the distinctively recognizable part, piece, of a system that is required to complete a function, in that particular system. Moreover, it carries out a distinguishable and necessary function in the operation of a specific system. For example, a computer has a number of components that make it whole, and the most essential of them is the Central Processing Unit.
Answer:
c) the components
Explanation:
I took the quiz
What are the key characteristics of a combustion and redox reactions?
Answer:
Redox reactions have a reducing agent and a oxidizing agent
Explanation:the reducing agent is more reactive than the oxidizing agent
The number of particles in a mole is known as
How many grams of H2S is needed to produce 18.00g of PbS if the H2S is reacted with an excess (unlimited) supply of Pb(CH3COO)2?
Answer:
2.56g of H₂S
Explanation:
The reaction of H₂S with Pb(CH₃COO)₂ is:
H₂S + Pb(CH₃COO)₂ → 2 CH₃COOH + PbS
Where 1 mole of H₂S produce 1 mole of PbS
18.00g of PbS (Molar mass: 239.3g/mol):
18.00g of PbS ₓ (1mol / 239.3g) = 0.0752 moles of PbS
As 1 mole of PbS is produced from 1 mole of H₂S, moles needed of H₂S are 0.0752
As molar mass of H₂S is 34.1g/mol, mass in 0.0752moles is:
0.0752 mol H₂S ₓ (34.1g / mol) = 2.56g of H₂S
Which of the following samples contains the greatest number of atoms?
a. 9 mole of CO2 b. 10 moles of Xe
c. 11 moles of N2O d. 12 moles of CO
Answer:
12 moles of CO
Explanation:
According to Avogadro, one mole of a substance, contains the same number of elementary entities as 12g of carbon-12. Now the number of elementary entities (atoms, molecules, ions, particles etc) in any substance is given by the Avogadro's constant.
Now since 1 mole of a substance contains Avogadro's number of atoms, it means that the substance with the highest number of moles will have the highest number of atoms.
With this in mind we can see that 12 moles of CO is expected to contain 72.24 ×10^23 atoms of CO. Hence the answer.
Answer:
c. 11 moles of N2O.
Explanation:
Hello,
In this case, for each substance, we use the Avogadro's number to compute the number of atoms in the given sample:
a.
[tex]atoms \ C=9molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =5.4x10^{24}atoms\ C[/tex]
[tex]atoms \ O=9molCO_2*\frac{2molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =1.1x10^{25}atoms\ O[/tex]
[tex]Total\ atoms=1.1x10^{25}+5.4x10^{24}=1.64x10^{25}atoms[/tex]
b.
[tex]atoms \ Xe=10molXe *\frac{6.022x10^{23}atoms\ Xe}{1molXe} =6.022x10^{24}atoms[/tex]
c.
[tex]atoms \ N=11molN_2O*\frac{2molN}{1molN_2O} *\frac{6.022x10^{23}atoms\ N}{1molN} =1.3x10^{25}atoms\ N[/tex]
[tex]atoms \ O=11molN_2O*\frac{1molO}{1molN_2O} *\frac{6.022x10^{23}atoms\ O}{1molO} =6.6x10^{24}atoms\ O[/tex]
[tex]Total\ atoms=1.3x10^{25}+6.6x10^{24}=2.0x10^{25}atoms[/tex]
d.
[tex]atoms \ C=12molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =7.2x10^{24}atoms\ C[/tex]
[tex]atoms \ O=12molCO_2*\frac{1molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =7.2x10^{24}atoms\ O[/tex]
[tex]Total\ atoms=7.2x10^{24}+7.2x10^{24}=1.44x10^{25}atoms[/tex]
Thus, we notice 11 moles of N2O have the greatest number of atoms.
Best regards.
Which sentence describes energy?
O A. It measures changes in the temperature of an object.
B. It measures the speed at which an object is moving.
O C. It measures the capacity to do work.
D. It measures the amount of mass an object has.
Answer:
C
Explanation:
energy is measures the capacity to do work.
Answer:
C
Explanation:
APEX
if the ph of a solution is 9 then its pOH will be
Answer:
5.
Explanation:
The pOH is found by subtracting the pH by 14, because the pH and the pOH always add up to 14. So the pOH of a solution with the pH of 9 would be 5.
Hope this helps you out. :)
21) Amines, amides, and amino acids are categories of *
1 pol
isomers
isotopes
organic compounds
inorganic compounds
Answer:
Organic compounds
Explanation:
I just did this question and apparently it’s that. (:
The correct answer is organic compounds.
Are amines, amides, and amino acids are organic compounds?Amines are organic molecules made up of a lone pair of nitrogen atoms.An amide is an organic functional group that has a carbonyl linked to a nitrogen, as well as any product that has this functional group.An amino acid is an organic compound composed of a basic amino group (NH2), an acidic carboxyl group (COOH), and a unique organic R group (or side chain).Learn more about organic compounds here:-
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Cellular respiration occurs? (2 points)
only in plant cells
only in animal cells
only in chlorophyll
in plant and animal cells
Answer:
in plant and animal cells
Explanation:
It happens in both and occurs in the mitochondria.
How your life would be affected if there was no more electricity?
Answer:
Lots of bad things would happen
Explanation:
People would lose their jobs
People would fall out of contact (no phones)
It would be pretty dark (no streetlights)
You would have to learn everything by book or asking someone
ect.
Answer: My life would change drastically.
Explanation:
This is because electricity is used in my everyday life . If I no longer had electricity then i would have to change my whole life and how I did things . I would have to adapt to my new environment without electricity.