Answer:
Explanation:
In research an unreliable source is the one which cannot be accepted by the scientific community. Such source generally includes the information which is not authentic and correct. Such source may include manipulation or unreliable results. The facts mentioned in some unreliable source are not based upon experimental testing.
How to identify a Chemical Property and a Chemical Change?
Physical properties are the traits of an object that can be readily seen such as size, color and state. Measuring or changing these properties does not affect the chemical nature of the matter. For example, a paper that is cut into small pieces has undergone a physical change. The pieces have a different quantity, size, shape and texture than the original sheet.
Chemical properties are the characteristics that describe the composition of matter. These traits are carried by each individual atom, or part of matter. Some examples of chemical properties include combustibility, flammability and reactivity. Another way to look at this is to think of the chemical properties as potentials. Dry paper has the potential to burn; this is flammability, a chemical property. Magnesium metal has the potential to combine with oxygen and form Magnesium Oxide.
What happened during the Renaissance that encouraged progress in the study of matter?
During the dark ages-All that wasn't around the christian religion were lost. Knowledge and discoveries before the Dark Ages were mainly in Greek ideas. Biblic scripts however were in Latin. Therefore all inventions up to the dark ages were lost and only religious scripts preserved in the churches. Outside the church, no one knew how to write, read or even communicate.
The Renaissance period has been encouraged the progress in study with the emergence of Italian masters, and new world.
Renaissance has been a French word that means rebirth. The period has been started in the early 13th century and has been lasted up to 16th century.
Progress during Renaissance periodThe period has been started in France. It has been the reconstructive period for the literature and art.
The period has been marked with the emergence of Italian masters such as Leonardo da Vinci, Raphael and Michelangelo. There has been the discovery of the new world with the work of Columbus.
Thus, the Renaissance period has been encouraged the progress in study with the emergence of Italian masters, and new world.
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Select the atomic models that belong to the same element.
Left Panel
The trick is to look at the protons, all other things being equal. The yellow spheres are neutrons we are led to believe. All the diagrams show the same number of electrons(2), so there is no help there.
The upper left
The upper right
The Lower left
All have 2 protons and 2 electrons. <<<< Answer Read the 3 lines above.
The center one has only 1 proton And the lower right has 3. Both of them are wrong.
Right Panel
You have answered this one correctly
The atomic number of nitrogen is 7. How many protons, neutrons, and electrons make up an atom of Nitrogen-15?
A nonpartisan iota of Nitrogen has a mass of 18. There are 7 protons in the core of this iota. What number of neutrons, complete electrons, and valence electrons are available
Nitrogen 15 has a nuclear mass of 15. The mass number is # protons in addition to # of neutrons, so for N-15 mass is 15 and the protons are dependably 7 so there must be 15-7=8 neutrons. N-15 has 7 electrons since it has 7 protons and p = e.
Which layer of the sun is only seen during the height of a total solar eclipse? A. Photosphere B. Corona C. Convection zone D. core
Question:Which layer of the sun is only seen during the height of a total solar eclipse?
Answer: Corona
Explanation:During a total solar eclipse parts of the Sun that we normally can't see become visible but during it we can see the corona
question answered by
(jacemorris04)
The layer of the Sun which is only seen during the height of a total solar eclipse is: B. Corona.
An eclipse refer to an astronomical event that usually takes place when a celestial body in space gets in between the Sun and another celestial body, leading to the total or partial obscuration (blocking) of light to the celestial body.
In Science, there are two (2) main types of eclipse and these are;
Lunar eclipse: this is an astronomical event that takes place when planet Earth comes in between the Moon and the Sun thereby causing it to cover the Moon with its shadow.Solar eclipse: this is an astronomical event that takes place when the Sun is obscured (blocked) by the Moon and engulfing a portion of the Earth.Total solar eclipse involves the total obscuration (blocking) of the Sun is obscured (blocked) by the Moon causing a complete engulfment of the Earth.
During the height of a total solar eclipse, Corona is the layer of the Sun that is only seen while the core, Photosphere, and Convection zone are not seen.
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Show the empirical formula manganese fluoride; 59.1% Mn and 40.9% F. Fill in the subscripts on the formula below. Make sure to have a whole number of each subscript, even if it is a 1. Mn____ F____.
Hey there!:
Given % of Mn=59.1% means 59.1 g of Mn present in 100 g of manganese fluoride.
Molar mass of Mn= 54.938 g/mol
Moles of Mn = mass / molar mass
59.1 /54.938 => 1.07 ≈ 1 mol.
and % of F=40.9% means 40.9 g of of F present in 100 g of manganese fluoride.
Molar mass of F=18.998 g/mol
Moles of F :
40.9 / 18.999 => 2.15 mol ≈ 2 mol.
The mole ratio between Mn:F= 1 : 2
Therefore the empirical formula of manganese fluoride:
=> MnF2=Mn1F2
Hope that helps!
Answer : The empirical formula of manganese fluoride is [tex]Mn_1F_2[/tex].
Solution : Given,
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of Mn = 59.1 g
Mass of F = 40.9 g
Molar mass of Mn = 54.94 g/mole
Molar mass of F = 18.99 g/mole
Step 1 : convert given masses into moles.
Moles of Mn = [tex]\frac{\text{ given mass of Mn}}{\text{ molar mass of Mn}}\times 1\text{ mole of Mn}[/tex] = [tex]\frac{59.1g}{54.94g/mole}\times 1\text{ mole of Mn}[/tex] = 1.076 moles
Moles of F = [tex]\frac{\text{ given mass of F}}{\text{ molar mass of F}}\times 1\text{ mole of F}[/tex] = [tex]\frac{40.9g}{18.99g/mole}\times 1\text{ mole of F}[/tex] = 2.154 moles
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For Mn = 1.076/1.076 = 1
For F = 2.154/1.076 ≈ 2
Mn : F = 1 : 2
The mole ratio of the element is represented by subscripts in empirical formula.
Therefore, the Empirical formula = [tex]Mn_1F_2[/tex]
20 POINTS!
ANSWER THESE 5 QUESTIONS!
You have a cup of water and a packet of powdered juice mix. You stir some of the powder into the cup of water and it quickly dissolves. You decide to add more juice mix to the cup and stir again. Again, the powder quickly dissolves. What can you conclude about the juice powder and water solution?
The powdered juice mix quickly dissolves in the water, indicating that it forms a solution. Stirring the mixture can increase the rate of dissolution. The fact that the mix dissolves again when more is added suggests that the solution was not saturated.
Explanation:The fact that the powdered juice mix quickly dissolves when added to the cup of water suggests that it forms a solution with the water. A solution is a homogenous mixture in which the solute particles are very small and become uniformly dispersed throughout the solvent. The rate of dissolution can be increased by stirring the mixture, which allows fresh solvent molecules to continually come into contact with the solute. Additionally, the fact that the mix quickly dissolves again when more is added suggests that the solution was not saturated and still had room for more solute to be dissolved.
Final answer:
The powdered juice mix forms a stable solution with the water, as indicated by its quick and complete dissolution. The act of stirring increases the rate of dissolution by allowing fresh solvent molecules to interact with the solute particles. The solution remains stable, without any settling or changes, and can pass through a filter without any separation.
Explanation:
The quick dissolution of the powdered juice mix in the cup of water indicates that it forms a stable solution. When a solute, such as the juice mix, is fully dissolved in a solvent, like water, it creates a homogeneous mixture called a solution. In this case, the solute particles in the juice mix are very small, allowing them to dissolve easily in the water.
Stirring the solution aids in dissolving more of the juice mix because it increases the frequency of collisions between the solvent molecules (water) and the solute particles (juice mix), increasing the rate of dissolution. Agitating the solution ensures that fresh solvent molecules continuously come into contact with the solute, speeding up the process.
By observing the quick dissolution of the juice mix and its ability to stay in solution without settling or changing upon passing through a filter, we can conclude that the juice powder and water solution forms a stable and fully dissolved mixture.
Calculate the frequency of a wave with a wavelength of 8.00x10 m. In what region of the electromagneti spectrum is this?
The frequency of the wave with a wavelength of is 3.748 × 10 ⁶ /s.
I attached the working and the answer to the question below. I hope I was able to help.
Please note that C = speed of light (2.998 × 10⁸ m/s), ν = frequency and λ= wavelength.
How many atoms are in 1.45 mol of pure aluminum
There are approximately 8.7319 × 10²³ aluminum atoms in 1.45 mol of pure aluminum, calculated by multiplying the moles of aluminum by Avogadro's number.
To determine the number of atoms in 1.45 mol of pure aluminum (Al), we use Avogadro's number, which states that one mole of any substance contains 6.022 × 10²³ atoms.
The calculation is as follows:
Identify the amount in moles: 1.45 mol of Al.
Multiply the amount in moles by Avogadro's number: 1.45 mol × 6.022 × 10²³ atoms/mol.
Perform the multiplication to find the total number of atoms: 1.45 × 6.022 × 10²³ = 8.7319 × 10²³ atoms of Al.
The SI defining constant Avogadro constant, often known as NA or L, has a precise value of 6.02214076×10²³ mol⁻¹. It serves as a normalisation factor for the amount of substance in a sample and is defined as the number of constituent particles per mole.
Therefore, there are approximately 8.7319 × 10²³ aluminum atoms in 1.45 mol of pure Al.
what are all of the elements that end with F electrons
The elements whose electron configurations end with f electrons are in the Lanthanide and Actinide series: those long series at the bottom of the Periodic Table (see image).
The atoms are adding electrons into f orbitals, but the f electrons are not always the last electrons in the electron configuration.
For example, the electron configuration of Eu is [Xe]6s²4f⁷, but that of Gd
is [Xe] 6s²4f⁷5d.
I have blocked off in red all the exceptions like Gd.
Which statements describe organic compounds? Check all that apply.
Organic compounds are commonly found in living things.
Organic compounds are not associated with or made from living things.
Organic compounds contain carbon.
Organic compounds usually lack carbon. Organic compounds are found in food.
Answer: The answers are A C E. I took the test.
Explanation:
1.00 g of He, 14.0g F2, and 19.0 g Ar are placed in a 13.0-L container at 20.0 °C. The total pressure (in atm) in the container is _____ atm.
Final answer:
To find the total pressure in the container, calculate the moles of each gas, use the ideal gas law to find the partial pressures, and then sum them up.
Explanation:
To find the total pressure in the container, we need to calculate the partial pressures of each gas and then sum them up.
First, we calculate the moles of each gas using their molar masses:
He: 1.00 g / 4.0026 g/mol = 0.2499 mol
F2: 14.0 g / 38.0 g/mol = 0.3684 mol
Ar: 19.0 g / 39.948 g/mol = 0.4755 mol
Next, we use the ideal gas law to calculate the partial pressures:
He: P(He) = (moles of He) x (R) x (temperature) / (volume) = (0.2499 mol) x (0.0821 L atm/mol K) x (293.0 K) / (13.0 L) = 0.498 atm
F2: P(F2) = (moles of F2) x (R) x (temperature) / (volume) = (0.3684 mol) x (0.0821 L atm/mol K) x (293.0 K) / (13.0 L) = 1.064 atm
Ar: P(Ar) = (moles of Ar) x (R) x (temperature) / (volume) = (0.4755 mol) x (0.0821 L atm/mol K) x (293.0 K) / (13.0 L) = 1.276 atm
Finally, we sum up the partial pressures to get the total pressure in the container:
Total pressure = P(He) + P(F2) + P(Ar) = 0.498 atm + 1.064 atm + 1.276 atm = 2.838 atm
please help question is attached
As the firetruck got closer, Sal noticed that the pitch of the siren got higher. Why did this happen?
The change in pitch of the firetruck's siren as it gets closer to the observer is due to the Doppler effect. As the firetruck approaches, the siren's pitch appears to increase, and as it moves away, the pitch appears to decrease. This phenomenon can be observed with passing cars, airplanes, and trains as well.
Explanation:The change in pitch of the siren as the firetruck gets closer is due to the Doppler effect. This effect describes the change in frequency of a sound wave or light wave as the source of the wave or the observer of the wave moves relative to each other.
In the case of the firetruck siren, as the firetruck approaches Sal, the pitch of the siren appears to increase because the sound waves are compressed, resulting in a higher frequency. As the firetruck moves away from Sal, the pitch appears to decrease because the sound waves are stretched, resulting in a lower frequency.
This change in pitch can also be observed with passing cars, airplanes, and trains, where the pitch decreases as they move away from the observer. The faster the firetruck (or any moving source) moves, the greater the shift in pitch.
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As the firetruck moves towards Sal, [tex]\( v_s \)[/tex] is negative (since it is moving towards the observer), which results in [tex]\( f' \)[/tex] being greater than [tex]\( f \)[/tex], indicating a higher pitch. Once the firetruck passes Sal and moves away, [tex]\( v_s \)[/tex] becomes positive, and the pitch Sal hears decreases, becoming lower than the emitted frequency.
The phenomenon Sal observed is known as the Doppler effect. As the firetruck approached Sal, the pitch of the siren got higher due to the Doppler effect.
The Doppler effect is a change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. This effect is commonly experienced with sound waves, such as the siren of an approaching firetruck.
When the firetruck is moving towards Sal, each successive sound wave is emitted from a position closer to Sal than the previous one. This causes the waves to be compressed in front of the firetruck, leading to a higher frequency of sound waves reaching Sal's ears. Since frequency is perceived as pitch, the siren sounds higher in pitch as the firetruck approaches.
Mathematically, the Doppler effect can be described by the following equation for sound waves:
[tex]\[ f' = \left( \frac{v + v_o}{v + v_s} \right) f \][/tex]
where:
[tex]- \( f' \)[/tex] is the observed frequency (the pitch Sal hears).
[tex]- \( f \)[/tex] is the emitted frequency (the actual pitch of the siren).
[tex]- \( v \)[/tex] is the speed of sound in air.
[tex]- \( v_o \)[/tex]is the speed of the observer (in this case, Sal is stationary, so[tex]\( v_o = 0 \))[/tex].
[tex]- \( v_s \)[/tex] is the speed of the source (the firetruck).
Please help!!!
Its not chemistry is science.
Which statements describe molecules? Check all that apply.
Molecules are made of two or more atoms. A
Molecules are all the same size B
Molecules range in size. C
Molecules are only made of atoms of the same element. D
Molecules are only made of atoms of different elements. E
Molecules are made of atoms of the same element or different elements.F
The following answers are A, C, and F
Molecules are composed of two or more atoms and can vary greatly in size. They can be made of either the same or different elements. Examples include O₂ for the same element and H₂O for different elements.
Let's review each statement to determine whether it accurately describes molecules:
Molecules are made of two or more atoms. (Correct) - Molecules are composed of two or more atoms bonded together chemically. For example, an oxygen molecule (O₂) consists of two oxygen atoms.Molecules are all the same size. (Incorrect) - Molecules vary in size depending on the number of bonded atoms and their arrangement. Smaller molecules, like O₂, have only a few atoms, whereas larger molecules, like DNA, can have millions of atoms.Molecules range in size. (Correct) - As mentioned, molecules can range from very small, like hydrogen molecules (H₂), to very large, like DNA.Molecules are only made of atoms of the same element. (Incorrect) - Molecules can consist of atoms of the same element or different elements. For instance, a water molecule (H₂O) consists of two hydrogen atoms and one oxygen atom.Molecules are only made of atoms of different elements. (Incorrect) - While some molecules, like CO₂, have different elements, others, like O₂, are made of the same element.Molecules are made of atoms of the same element or different elements. (Correct) - Molecules can be formed from either the same element, like O₂, or different elements, like H₂O.which of these is an example of a physical change
A. breaking Bread
B. baking Bread
C. digesting Bread
D. toasting Bread
how do new scientific discoveries affect our everyday life
It affects our everday life because of new inventions and easier ways to make/produce different stuff!
Why do elements such as Neptunium, Plutonium, Californium, Einstenium, Bohrium, Flerovium, Radon, Oganesson, and a few others have half a number in parentheses at the bottom of their box on the periodic table instead of the atomic weight? Thanks! :)
All the elements you listed share a common trait: they are synthetic, radioactive elements. These elements do not have a stable isotope, so for a radioactive element, its most stable isotope's atomic mass will be listed in parentheses.
One such example would be plutonium. This element has 6 different isotopes with differing half-lives. The most stable isotope for plutonium is plutonium-244, with a half-life of around 80 million years. Therefore, the atomic mass listed for plutonium will be (244).
What is the pH of a solution that has a [H+] of 1.5 × 10−5 M?
pH = 4.82
[H⁺] = 1.5 × 10⁻⁵ mol·L⁻¹.
pH = -log[H⁺] = -log(1.5 × 10⁻⁵) = 4.82
Give the masses of the three most abundant Cl2O molecules
Chlorine has the following % abundance and mass:
Cl-35 = 75.76 %, 34.9688 amu
Cl-37 = 24.24 %, 36.9659 amu
Oxygen has the following % abundance and mass:
O-16 = 99.757 %, 15.9949 amu
O-17 = 0.038 %, 16.9991 amu
O-18 = 0.205 %, 17.9991 amu
Based in the % abundance O-16 is the most abundant oxygen isotope and Cl-35 is the most abundant chlorine isotope
So the most abundant molecule of Cl2O and their respective mass are as follows:
1) Cl-35, Cl-35, O-16
Mass = 34.9688 amu + 34.9688 amu + 15.9949 amu = 85.9325 amu
2) Cl-35, Cl-37, O-16
Mass = 34.9688 amu + 36.9659 amu + 15.9949 amu = 87.9296 amu
3) Cl-37, Cl-37, O-16
Mass = 36.9659 amu + 36.9659 amu + 15.9949 amu = 89.9267 amu
Mass is the quantity of matter present in a substance. The masses of the most abundant molecule of [tex]\rm Cl_{2}O[/tex] are 85.9325, 87.9296, and 89.9267 amu.
What are isotopes?Isotopes are the elements of the same species with the same atomic number but differ in atomic mass and physical properties.
% abundance and mass of chlorine are:
Cl-35 = 34.9688 amu
Cl-37 = 36.9659 amu
% abundance and mass of oxygen are:
O-16 = 15.9949 amu
O-17 = 16.9991 amu
O-18 = 17.9991 amu
O -16 is the most abundant form of the oxygen isotope and Cl -35 of chlorine.
The masses of the most abundant molecule are given as:
Cl-35, Cl-35, O-16:
[tex]34.9688 \;\rm amu + 34.9688 \;\rm amu + 15.9949 \rm \;amu = 85.9325\;\rm amu[/tex]
Cl-35, Cl-37, O-16:
[tex]34.9688 \;\rm amu + 36.9659 \;\rm amu + 15.9949 \;\rm amu = 87.9296 \;\rm amu[/tex]
Cl-37, Cl-37, O-16:
[tex]36.9659 \;\rm amu + 36.9659 \;\rm amu + 15.9949 \;\rm amu = 89.9267 \;\rm amu[/tex]
Therefore, 85.9325, 87.9296, and 89.9267 amu are the masses of the most abundant form of the molecule.
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Hydrogen (atomic number 1) has three isotopes: ¹H, ²H, and ³H. What is the number of protons in an atom of hydrogen with the highest mass number?
(a) 2
(b) 1
(c) 0
(d) 3
Hydrogen, regardless of its isotopes, always has 1 proton. This is due to its atomic number being 1. Therefore, even the isotope of hydrogen with the highest mass number (³H) still has only 1 proton.
Explanation:The atom of hydrogen with the highest mass number is ³H. The number before 'H' represents the mass number, which is the total number of protons and neutrons in the nucleus. However, regardless of its isotopes, hydrogen's atomic number is 1, indicating that it always has 1 proton. So, in response to your question, the hydrogen atom with the highest mass number still has just 1 proton.
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what is the molar mass of BaBr2?
multiple choice on the picture
B. 297.1 g/mol
Is your answer! ;)
Answer: Option (B) is the correct answer.
Explanation:
Molar mass is defined as the sum of atomic mass of all the atoms present in a compound.
For example, atomic mass of barium (Ba) is 137.32 g/mol and atomic mass of a bromine atom is 79.90 g/mol.
Therefore, calculate molar mass of [tex]BaBr_{2}[/tex] as follows.
Molar mass = atomic mass of Ba + 2 [tex]\times atomic mass of Br[/tex]
= [tex]137.32 g/mol + 2 \times 79.90 g/mol[/tex]
= 297.12 g/mol
Therefore, we can conclude that molar mass of [tex]BaBr_{2}[/tex] is 297.1 g/mol.
Select the correct answer.
Lyndon is investigating whether putting plastic on her windows will help seal out cold winter drafts. She covers a window on the south side of her house with plastic and measures the inside temperature near the window. She also measures the inside temperature near a window without plastic on the north side of her house. The windows are the same size and design. Why is this not an ideal controlled investigation?
A. The windows should be different sizes to introduce variation.
B. The drafts at each window may be different because the windows aren’t near each other.
C. Temperature isn’t a good indicator of cold winter drafts.
D. Outside temperature is a better indicator of cold winter drafts than inside temperature.
E. The type of plastic used in the investigation isn’t mentioned.
Answer: B
Explanation: PLATO
which of the follow are pure substances
the answer is v
hope it helps!
Pure substances in Chemistry are either elements or compounds. Elements are the simplest form of pure substances, examples include gold or oxygen. Compounds are made up of two or more different types of elements in a fixed ratio, such as water or carbon dioxide.
Explanation:In Chemistry, pure substances are substances that are made up of only one type of particle and have a fixed or constant structure. They are classified into elements and compounds. Elements are the simplest form of pure substances and cannot be broken down any further.
Examples include gold, copper, oxygen and carbon. Compounds are pure substances that are made up of two or more different types of elements that are chemically combined in a fixed ratio. Examples include water (H2O), carbon dioxide (CO2), and sodium chloride (NaCl).
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What are the two main types of luster? A. dense and porous B. coarse and smooth C. metallic and nonmetallic D. striated and non-striated
The answer is metallic and nonmetallic.
Answer:
The answer is C. Metallic and Non-metallic.
Explanation:
Luster is a physical property that shows how light acts on the surface of a material and how it is reflected in it. The main types of brightness are:
Metallic shine = This type of shine occurs in metals, since they are very opaque and whose surface has a lustrous appearance, that is, it totally reflects light.Non-metallic shine = This type of shine is presented in minerals with a light color, produced by transparent substances, such as the diamond.An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be . If the atom instead gains 4 electrons, the net charge will be
Answer: If the atom loses 2 electrons, the net charge on the atom will be 2+
If the atom gains 4 electrons, the net charge on the atom will be 4-
Explanation:
An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.
Protons are positively charged, neutrons are neutral and both are located in nucleus where mass of an atom is concentrated.
Electrons are negatively charged and are located outside the nucleus where they orbit in different energy levels around the nucleus.
In an atom, when electrons are lost, the atom gains a positive charge and forms cation. In an atom, when electrons are gained, the atom occupies a negative charge and forms anion.
Thus an atom with 9 electrons and 9 protons will be electrically neutral.
On losing 2 electrons, there will be 7 electrons and 9 protons will have 2+ charge.On gaining 4 electrons, there will be 13 electrons and 9 protons will have 4- charge.
Select all that apply.
Which of the following are homogeneous solutions?
sugar water
air
peanuts and water
an unopened soft drink
cement
A 75.0-milliliter lightbulb is filled with neon. There are 7.16 × 10-4 moles of gas in it, and the absolute pressure is 116.8 kilopascals after the bulb has been on for an hour. How hot did the bulb get?
n = number of mole of sample of helium gas = 7.16 x 10⁻⁴ moles
T = temperature of the gas = temperature of the bulb ?
V = Volume of helium gas = 75 mL = 7.5 x 10⁻⁵ m³
P = pressure of the helium gas = 116.8 kPa = 116.8 x 10³ Pa (1 k = 1000)
Using the equation
P V = n R T
inserting the values
(116.8 x 10³) (7.5 x 10⁻⁵) = (7.16 x 10⁻⁴) (8.314) T
T = 1471.6 C
Answer: 1470 K
Explanation: It asks to calculate the kelvin temperature of the light bulb. Looking at the given info, it is based on ideal gas law equation, PV=nRT.
Given:
V = 75.0 mL = 0.0750 L
P = 116.8 kPa
We know that 101.325 kPa = 1 atm
So,
= 1.15 atm
R is universal gas constant and its value is .
T = ?
Let's plug in the values in the equation and solve it for T.
0.08625 = 0.00005878(T)
T = 1467 K
So, the temperature of the light bulb would be 1467 K, but since we have to round the total to equal 3 significant figures, the answer is 1470 K