The mass of an electron is equal to 9.10938 × 10e–31 kg, the speed of light (c) is equal to 3.00 × 10e8 m/s, and Planck's constant is h = 6.626 × 10e–34. The velocity of these electrons is 297,196,680.87m/s
What is velocity ?The term velocity is defined as the direction of the movement of the body or the object. Speed is primarily a scalar quantity. Velocity is essentially a vector quantity.
We know the equation connecting potential and velocity of electrons is as follows,
eV=12mv2
Where eV is the kinetic energy
Also, we know
According to Einstein equation and de broglie equation we can write
mc2=hc
So,
mc = h
Given
me = 9.10938 × 10e
c = 3.00 × 10e8 m/s
h = 6.626 × 10e–34
λ = h / mc
= 2.45 × 20 ⁻¹²m
λ = h / mv
v = 297,196,680.87m/s
Thus, the velocity of these electrons is 297,196,680.87m/s
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The amount of energy required to change 20g of water to steam is +150 KJ/mol. Calculate the standard heat of vaporization of water.
The amount of energy required to change 20g of water to steam is +150 KJ/mol. The standard heat of vaporization of water is 7.5 KJ/mol.
What is heat of vaporization ?The amount of energy required to convert a liquid to a vapour at constant temperature and pressure is known as latent heat. The heat of fusion is the energy required to convert a solid to a liquid, and the heat of sublimation is the energy required to convert a solid to a gas.
Given:
q = 150 KJ/mol.
m = 20gram
The standard heat of vaporization of water is calculated by given formula
Hv = q / m
Where,
Hv is heat of vaporization of water
q is heat energy
m is mass
By substituting given value in equation we get,
Hv = 150 / 20
= 7.5 KJ/mol
Thus, the standard heat of vaporization of water is 7.5 KJ/mol.
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A sample of trifluoroacetic acid, C2HF3O2, contains 47.3 g of oxygen. Calculate the mass of the trifluoroacetic acid sample.
Based on the percentage mass of oxygen in trifluoroacetic acid, the mass of the trifluoroacetic acid sample is 168.5 grams.
What is the percentage mass of oxygen in trifluoroacetic acid?The percentage mass of oxygen in trifluoroacetic acid is determined as follows:
The molar mass of trifluoroacetic acid = 12 * 2 + 1 + 19 * 3 + 16 * 2
The molar mass of trifluoroacetic acid = 114 g
The percentage mass of oxygen in trifluoroacetic acid = (16 * 2)/114 * 100%
The percentage mass of oxygen in trifluoroacetic acid = 28.07%
The mass of the trifluoroacetic acid sample will be 47.3/ 28.07% = 168.5 grams
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4. Which formula represents the binary molecular compound dinitrogen tetroxide?
O N₂0
ON₂04
O NO4
O N₂02
N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide. Therefore, option B is correct.
What is the binary molecular compound ?Binary molecular compounds are made up of exactly two nonmetal elements. HF, NO2, and P2O5 are a few examples. It is extremely simple to name binary molecular compounds. The first element is given its element name, followed by ide; the second element is given its root (hydr, bor, carb, ox, fluor, etc.).
In N₂0₄ molecule there are two nitrogen atoms at the suffix so, it is binary and in oxygen atom its suffix is 4 so, it is tetroxide. Therefore, N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide.
Thus, option B is correct.
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If 99.7632 g of boiling water are added at a temperature of 100.79°C. how much heat (in J) will have been released to the solution in the calorimeter when the solution reaches equilibrium at 64.4°C? (5 sf) (Hint: I'm asking you to calculate qhot for this exothermic process).
The reaction is exothermic and the heat that is released is exothermic reaction.
What is the heat that is released?We have to note that we can say that the reaction is an exothermic reaction when there is the release of heat in the system and then we know that the release of the heat would determine the equilibrium temperature.
We know that;
H = mcdT
m = mass of the water
c = Heat capacity of the water
dT = temperature change
We then have that;
H = 99.7632 * 4.2 * (64.4 - 100.79)
H = -15.2 kJ
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What are the molecular weights of the following compounds? 1. MgCl₂ 2. (NH4)SO4
The molar mass of compound of magnesium chloride is 95.211 g/mole while that of ammonium sulfate is 132.14 g/mole.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
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The pressure of a gas sample at 37.0 °C is increased from 1.10 atm to 2.30 atm by heating at a constant volume. What is the temperature (in °C) of the gas at 2.30 atm?
Considering the Gay Lussac's Law, the the temperature of the gas at 2.30 atm is 375.18 °C.
Definition of Gay Lussac's LawGay Lussac's Law establishes the relationship between the pressure and temperature of a gas when the volume is constant.
This law establishes that the pressure of the gas is directly proportional to its temperature because as the temperature increases the gas molecules move faster and therefore the number of collisions against the walls increases. In other words, the pressure increases since the container has fixed walls.
Mathematically, Gay Lussac's Law says that the ratio between pressure and temperature is constant:
P÷T=k
where
P is the pressure.T is the temperature.k is a constant.Analyzing an initial state 1 and a final state 2, it is fulfilled:
P₁÷T₁=P₂÷T₂
Temperature at 2.30 atmIn this case, you know:
P₁= 1.10 atmT₁= 37 °C= 310 K (being 0°C= 273 K)P₂= 2.30 atm T₂= ?Replacing in Gay Lussac's law:
1.10 atm÷ 310 K= 2.30 atm÷T₂
Solving:
(1.10 atm÷ 310 K)×T₂= 2.30 atm
T₂= 2.30 atm÷ (1.10 atm÷ 310 K)
T₂= 648.18 K= 375.18 °C
Finally, the final temperature is 375.18 °C.
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A particular frost-free refrigerator uses about 795 kWh of electrical energy per year. Express this amount of energy in J, kJ , and Cal.
The amount of energy used by the refrigerator is given in J, kJ, and Cal as follows:
In J = 2.862 * 10⁹ JIn kJ = 2.862 * 10⁶ KJIn cal = 6.86 * 10⁸ calWhat is the conversion factor from kilowatt-hour (kWh) to Joules (J)?The conversion factor from kilowatt-hours to joules is given below:
1 kWh = 1000 * 3600 J
1 kWh = 3600000 J
The energy used by the frost-free refrigerator is given below as follows:
795 kWh = 795 * 3600000 J
795 kWh = 2.862 * 10⁹ J
795 kWh = 2.862 * 10⁹ J / 1k/J
795 kWh = 2.862 * 10⁶ KJ
1 Joule = 0.24 Cal
2.862 * 10⁹ J = 2.862 * 10⁹ J * 0.24 cal/J
2.862 * 10⁹ J = 6.86 * 10⁸ cal
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The evidence in figure 2 and table 1 which describes the changes in the rock after a year is the presence of a round edge.
What is Weathering?This is referred to as the breaking down or dissolving of rocks and minerals on Earths surface through elements such as wind, water etc.
In the diagram given, the rock previously had a sharp edge but as time went on there was breakdown of the edges which resulted in it becoming round and is therefore the evidence that weathering most likely occurred in the rock.
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118Sn 117.90 47.%
119Sn 118.90 53.%
Use these measurements to complete the entry for tin in the Periodic Table that would be used on 98765 ALEKS. Round your entry for the atomic mass to 3 significant digits.
___
Sn
___
The average atomic mass of tin is 118.
What is the relative atomic mass of tin?The average atomic mass of an element can be calculated by taking into account the isotopic composition of the element and the atomic masses of its isotopes. The average atomic mass is found by weighting the atomic masses of each isotope with its relative abundance, and then summing these values.
Average atomic mass = (mass of isotope 1 * abundance of isotope 1) + (mass of isotope 2 * abundance of isotope 2) + ... + (mass of isotope n * abundance of isotope n)
For the average atomic mas of tin;
(117.9 * 0.47) + (118.9 * 0.53) =
55.4 + 63.0
= 118.4
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Balsa wood has a typical density of 140kg/m^3 . What is the volume of a piece of balsa wood weighing 50lbs?
The volume of the balsa wood weighing 50lbs is approximately 0.162 cubic meters.
What is volume?Volume is defined as the space occupied within the boundaries of an object in three-dimensional space.
To find the volume of a piece of balsa wood weighing 50lbs, we need to first convert the weight to kilograms and then divide by the density of balsa wood.
1 lb = 0.45359237 kg
So, 50 lbs = 50 * 0.45359237 = 22.6796185 kg
The volume of the balsa wood can then be calculated as follows:
Volume = 22.6796185 kg / (140 kg/m^3) = 0.162 m^3
Therefore, The volume of the balsa wood weighing 50lbs is approximately 0.162 cubic meters.
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NEED HELP WITH CHEMISTRY ASAP
Answer:
Below
Explanation:
a) From the equation every 2 moles of (CuNo3)2 results in ONE mole of O2
starting with 5 moles you would get 2 1/2 moles of O2
each mole of O2 weighs ( 2 * 15.99) = 31.98 g ( from periodic table)
2 1/2 of these would weigh 79.95 g
b) each mole of Cu(NO3)2 produces the same number of moles of Cu O
how many moles of Cu (NO3)2 are in 87.49 g
again from periodic table Cu = 63.546 gm N = 14.007 O=15.999
total mole weight of Cu(No3)2 would then be 187.554 g
87.49 g / 187.554 g / mole = .466 moles the same amount of Cu O
c) Want to try this one yourself?
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Answer:
The edges changes quite drastically and the size went down by a millimeter. The color and hardness didn't change at all. The most noticeable difference was the edges.
A reaction has a rate constant of 0.0017/s at 400.0 K and 0.689/s at 450.0 K.
a. Determine the activation barrier for the reaction.
b. What is the value of the rate constant at 425 K?
The molecules mix more slowly in a low-rate reaction than they do in an elevated reaction. Therefore, the activation barrier for the reaction is 122 kJ.
What is rate of reaction?The change in concentration of each of the products or reactants each unit of time is referred to as the rate of reaction. The pace that a chemical reaction takes place is known as the reaction rate. The molecules mix more slowly in a low-rate reaction than they do in an elevated reaction.
log(k[tex]_2[/tex] / k[tex]_1[/tex])=(-Ea/R)×(1/T[tex]_1[/tex]-1/T[tex]_2[/tex])
Where,
k[tex]_1[/tex] = 0.0117 s-1
k[tex]_2[/tex]= 0.689 s-1
T[tex]_1[/tex] = 400.0 k
T[tex]_2[/tex] = 450.0 k
R is the ideal gas constant
R = 8.314 KJ / (Kmol * K)
Substituting all the given values, we get
ln (0.0117/0.689)=-Ea/(8.314)*((1/400)-(1/450))
Ea = 122 kJ
Therefore, the activation barrier for the reaction is 122 kJ.
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Answer:
weathering
Explanation:
This is typical erosion of rocks / soil etc caused by wind/rain/ice etc