We obtain the nutritional calories as 2967 cal/g.
What is the nutritional Calories are there per gram of the candy?Now we know that heat is evolved when we combust a compound or a substance inside the bomb calorimeter. Given that we have the following information about the system;
Temperature rise = 2.42 ∘C
Heat capacity = 30.70 kJ⋅K−1
The we have the energy as obtained from;
H = 30.70 kJ⋅K−1 * 2.42 ∘C = 74.29 kJ or 17.8 * 10^3 cal
Now we are required in this question as we have it to obtain the heat capacity per gram as; 17.8 * 10^3 cal/6g = 2967 cal/g
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Aluminum has a density of 2.70 g/mL. What is the volume of 546 g of Al?
Answer:
222.2cm^2?
Explanation:
cos volume equals mass divided by density
Calculate the mass of water produced when 6.26g of butane reacts with excess oxygen
The mass of water produced when 6.26g of butane reacts with excess of oxygen will be 9.78g.
According to given question, the reaction would be:
C₄H₁₀ + 13/2O₂ --- 4CO₂ + 5H₂O
6.26g 0 0
As we know,
(mole of C₄H₁₀)÷coefficient = (mole of H₂O)÷coefficient
6.26/molecular weight ÷ 1 = mass of H₂O/molecular weight ÷ 5
6.26÷58 = Mass of H₂O/18×5
Mass of H₂O = 9.78g
Therefore, the mass of water produced when 6.26gram of butane reacts in the presence of excess of oxygen will be 9.78gram.
The combustion of butane is a reaction between butane and oxygen gas that leads to the production of carbon dioxide gas and water. This hydrocarbon combustion reaction releases heat energy and is an example of an exothermic reaction.
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The total pressure of a mixture of CO2 and O2 is 1.03 atm. If the pressure of the CO2 is 560. torr, what's the pressure of O2 in mmHg?
The pressure (in mmHg) of O₂, given that CO₂ has a pressure of 560 torr is 222.8 mmHg
We'll begin by converting 1.03 atm to torr. This can be obtained as follow:
1 atm = 760 torr
Therefore,
1.03 atm = (1.03 atm × 760 torr) / 1 atm
1.03 atm = 782.8 torr
Next, we shall determine the pressure of O₂. This can e obtained as follow:
Total pressure = 782.8 torr Pressure of CO₂ = 560 torrpressure of O₂ =?Total pressure = pressure of CO₂ + pressure of O₂
782.8 = 560 + pressure of O₂
Collect like terms
Pressure of O₂ = 782.8 - 560
Pressure of O₂ = 222.8 torr
Finally, we shall convert 222.8 torr to mmHg. This is illustrated below
Recall
760 torr = 760 mmHg
Therefore,
222.8 torr = 222.8 mmHg
Thus, we can conclude that the pressure of O₂ is 222.8 mmHg
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What is the IUPAC name for the compound shown?
The IUPAC name of the compound given in the question is 2,2,3-trimethylpentane
How do I name organic compound?The naming of organic compounds has been made easier, owning to the the rules of the international union of pure and applied chemistry (IUPAC).
The IUPAC naming of organic compounds can be obtained by following these steps:
Locate the longest continuous carbon chain.Identify the substituent groups attached to the compound.Give the substituents groups the lowest count by identifying their location.Combine the above to get the name of the compound.With the above information in mind, we can name the compound as follow:
The longest continuous carbon chain is 5 i.e pentaneThe substituent group attached is methylThere are three methyl group of which two are located at carbon 2, and one at carbon 3Thus, the IUPAC name of the compound is:
2,2,3-trimethylpentane
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A sample of gas occupies 6.00 liters at a temperature of 200. K.
The question requires us to calculate the volume of a gas when its pressure is kept constant and its temperature is raised from 200 to 600 K.
The following information was provided by the question:
Initial volume of gas = V(1) = 6.00 L
Initial temperature of gas = T(1) = 200 K
Final temperature of gas = T(2) = 600 K
According to Charle's Law, the volume of a given confined gas under constant pressure increases as the temperature increases and decreases as the temperature decreases. In other words, the Charle's Law states that the volume of a given amount of gas is directly proportional to its temperature on the kelvin scale when the pressure is held constant
Mathematically, we can write this as:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]where V(1) and T(1) refers to the volume and temperature of the gas at the initial state, and V(2) and T(2) refers to volume and temperature at the final state.
We can rearrange the equation above in order to calculate the final volume of a gas:
[tex]V_2=\frac{V_1\times T_2_{}}{T_1}[/tex]Now, we can apply the values given by the question to this equation and calculate the final volume of the gas:
[tex]V_2=\frac{(6.00L)\times(600K)}{(200K)}=18.0L[/tex]Therefore, the final volume of the gas when the temperature is increased under constant pressure is 18.0 L and the best option to answer this question is letter D.
PLSSS HELP WILL RATE 5-STAR AND GIVE A THANKS PLUS MAYBE... BRAINLIEST!!! PLSS!!!
Answer 2:
Rotation of the Earth: When the earth rotates on its own axis, not moving around its orbit but rotating on its tilted axis (23°). That motion is known as rotation.Revolution of the Earth: When the earth revolves in its orbit around the sun along with rotation which is being done on its own axis as well.Therefore, Earth is in two types of motion-
rotating on its own axis.revolving around the sun with its particular orbit.Answer 3:
In rotation, it takes 24 hours or a day to complete one rotation on its axis.In revolution, Earth takes 365 days 6 hours, and 9 minutes exactly, or say one year to complete one revolution around the sun.Answer 4:
Changes in the day and night occur due to the rotation of the earth. It also impacts ocean and air currents.Revolution causes changes in the weather and climate across the globe. Our seasons come and go periodically because of the revolution of the earth.Answer 5:
If the earth's rotation decrease by half of its original speed then, It will take 48 hours to complete one rotation as earlier it was taking 24 hours with the original speed. If speed is decreased to half, time doubles.The number of daylight changes from 12 hours to 24 hours.The number of darkness changes from 12 hours to 24 hours as earlier it was taking 12 hours each ( day and night).It will change our whole daily routine as the number of days and nights increases. The number of sleeping time, as well as working time, will increase respectively.It will take to make our habits according to the number of days and nights, however, they both will be equal, and therefore, it will have the same effect as before.To know more about the revolution's effects, find the below link:
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What is the mass in grams of carbon dioxide that would be required to react with 84.6 g of LiOH in the following chemical reaction? 2 LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
The mass of CO₂ that would be required to react with 84.6g of LiOH in the following reaction would be 77.5g
According to the given reaction,
CO₂(g) + 2LiOH(g) --- Li₂CO₃ + H₂O(g)
? (84.6g)
As we know,
(mole of CO₂/coefficient) = (mole of LiOH/coefficient)
mole of CO₂/1 = (84.6/Molecular weight÷2)
(mass of CO₂/molecular weight of CO₂) = (84.6/molecular weight of LiOH÷2)
mass of CO₂/44 = 84.6/48
mass of CO₂ = 77.5g
Therefore, mass of CO₂ = 77.5g
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Balance the following by the method of half reactions:
S2O32- + H2O + Cl2 --> SO42- + Cl- + H+
What are the total number of electrons transferred in the balanced half reactions?
From the method of half-reactions, the balanced equation of the reaction is given below:
S₂O₃²⁻ (aq) + H₂O (l) + 4 Cl₂ (g) ---> 2 SO₄²⁻ (aq) + 2 H⁺ (aq) + 8 Cl⁻ (aq)Eight electrons were transferred.
What are half-reactions?Half reactions are reactions that show the processes of oxidation and reductions that occur in a redox reaction as separate or individual reactions.
The half-reactions of the given equation are as shown below:
Oxidation:
Unbalanced - S₂O₃²⁻ (aq) + H₂O (l) ---> SO₄²⁻ (aq) + H⁺ (aq)
Balanced - S₂O₃²⁻ (aq) + H₂O (l) ---> 2 SO₄²⁻ (aq) + 8 e⁻ + 2 H⁺ (aq)
Reduction:
Unbalanced - Cl₂ ---> Cl⁻
Balanced - 4 Cl₂ (g) + 8 e⁻ ---> 8 Cl⁻ (aq)
Overall balanced equation: S₂O₃²⁻ (aq) + H₂O (l) + 4 Cl₂ (g) ---> 2 SO₄²⁻ (aq) + 2 H⁺ (aq) + 8 Cl⁻ (aq)
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At noon on a clear day, sunlight reaches the earth's surface at Madison, Wisconsin, with an average intensity of approximately 5.00 kJ·s−1·m−2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 7.60 cm2 area per second?
There are 2.08 x 10¹⁸ photons/sec.
Wave energy:
E = nhc/λ
3000 = (n x 6.63 x 10⁻³⁴ x 3 x 10⁸)/(510 x 10⁻⁹)
n = 7.69 x 10²¹ photons/sec/m²
2.70 cm² = 2.70 /10,000 m²
= 2.7 x 10⁻⁴
photons/sec = 7.69 x 10²¹ x 2.7 x 10⁻⁴
= 2.08 x 10¹⁸ photons/sec.
Hitting a square meter solar panel at right angles requires about 30,000 photons per second producing 1 watt of energy at 100% efficiency. The numbers obtained without assuming constant spectral power distribution and photon energy will be dealt with in a later post, but for now, we assume that a daylight standard D bulb at 5300 K will work around 11,000 Suffice it to say. Chemical reactions in the body not only release energy and produce heat, but they also release small amounts of photons, the elementary particles of light.
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Calculate either [H3O+] or [OH−] for each of the solutions at 25 °C. Solution A: [OH−]=3.29×10−7 M; [H3O+]= _________M Solution B: [H3O+]=9.63×10−9 M; [OH−]= ____________M Solution C: [H3O+]=6.49×10−4 M; [OH−]= __________M Which of these solutions are basic at 25 °C? Solution A: [OH−]=3.29×10−7 M Solution C: [H3O+]=6.49×10−4 M Solution B: [H3O+]=9.63×10−9 M
Solution A and B are BASIC
[tex]\begin{gathered} solution\text{ A: }[H_3O^+]=3.039\times10^{-8}M \\ solution\text{ B: }[OH^-]=1.038\times10^{-6}M \\ solution\text{ C: }[OH^-]=1.54\times10^{-11}M \end{gathered}[/tex]Explanations:Using the formula below to determine the concentration of the hydroxonium ion;
[tex]\begin{gathered} [H_3O^+][OH^-]=1\times10^{-14} \\ [H_3O^+]=\frac{1\times10^{-14}}{3.29\times10^{-7}} \\ [H_3O^+]=\frac{1}{3.29}\times10^{-14-(-7)} \\ [H_3O^+]=0.3039\times10^{^{-7}} \\ [H_3O^+]=3.039\times10^{-8}M \end{gathered}[/tex]Determine the pH
[tex]\begin{gathered} pH=-log[H_3O] \\ pH=-log(3.039\times10^{-8}) \\ pH=-(-7.5) \\ pH=7.5 \end{gathered}[/tex]This shows that the solution A is BASIC since the pH is greater than 7
For solution B
[tex]\begin{gathered} [OH^-]=\frac{1\times10^{-14}}{[H_3O^+]} \\ [OH^-]=\frac{1\times10^{-14}}{9.63\times10^{-9}} \\ [OH^-]=0.1038\times10^{-5}M \\ [OH^-]=1.038\times10^{-6}M \end{gathered}[/tex]Determine the pH
[tex]\begin{gathered} pH=-log[H_3O^+] \\ pH=-log(9.63\times10^{-9}) \\ pH=-(-8.02) \\ pH=8.02 \end{gathered}[/tex]This shows that the solution B is BASIC since the pH is greater than 7
For the solution C
[tex]\begin{gathered} [OH^-]=\frac{1\times10^{-14}}{[H_3O^+]} \\ [OH^-]=\frac{1\times10^{-14}}{6.49\times10^{-4}} \\ [OH^-]=0.1540\times10^{-10}M \\ [OH^-]=1.54\times10^{-11}M \end{gathered}[/tex]Determine the pH of the solution C
[tex]\begin{gathered} pH=-log[H_3O^+] \\ pH=-log(6.49\times10^{-4}) \\ pH=-(-3.19) \\ pH=3.19 \end{gathered}[/tex]Since the pH of the soution C is less than 7, hence the solution C is ACIDIC
What is the pH of a 0.49 M solution of hydrocyanic acid?
Report your answer to 2 decimal places.
The pH of a 0.49 M solution of hydrocyanic acid is 0.31.
How to calculate pH?pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
The pH of a solution can be calculated using the following equation or expression:
pH = - log {H⁺}
According to this question, a 0.49 M solution of hydrocyanic acid. The pH can be calculated as follows:
pH = - log {0.49}
pH = 0.31
Therefore, 0.31 is the pH of the solution.
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The American Heart Association recommends to eat no more than 2,301mg of sodium per day. Convert the mass of
sodium to ounces, if 1 oz = 28.3459g. Use correct significant figures. 2301mg x (0.001g / 1 mg) x (1 oz/ 28.3459g) =
The mass of 2,301 grams of sodium in ounces is 0.0811757609 ounces.
The amount of sodium recommended by American heart association is 2301 mg. This limit should not be crossed in a day.
We have to convert Mass of sodium from mg to ounces.
We know,
1 ounce = 28.3459 grams.
We also know,
1 gram = 1000 milligrams.
So,
28.3459 grams = 28.3459 x 1000 milligrams.
28.3459 grams = 28345.9 milligrams.
1 ounce = 28345.9 mg.
1 mg = 1/28345.9 ounces
Weight of sodium 2301mg in ounces,
2301mg = 2301/28345.9 ounces
Dividing till last significant figure,
2301 mg = 0.0811757609 ounces.
Mass of sodium in ounces is 0.0811757609.
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"What is the % TDS Coffee if the refractive index, np, is 1.3384 and the
equation that relates refractive index to % TDS Coffee is
np = 0.00175 (% TDS Coffee) + 1.3342"
The relation between %TDS coffee and refractive index is given by the formula:
np = 0.00175 (% TDS Coffee) + 1.3342
In the given case
np = 1.3384
So, substituting the value of np in the equation above, we get:
1.3384 = 0.00174 (%TDS Coffee) + 1.3342
⇒ 1.3384 - 1.3342 = 0.00174 (%TDS Coffee)
⇒ 0.0042 = 0.00174 (%TDS Coffee)
⇒ (%TDS Coffee) = 0.0042/0.00174
⇒ %TDS Coffee = 2.4137
Hence the value of %TDS Coffee is 2.4137
What is Refractive Index?How much light is twisted or refracted when it enters a material depends on the material's refractive index. The intensity of the reflected light (determined by Fresnel's equations), the critical angle for total internal reflection, and Brewster's angle are all influenced by the refractive indices.The refractive index can be thought of as the parameter that reduces the speed and wavelength of the radiation relative to their vacuum values: the speed of light in a medium is v = c/n and the wavelength in that medium is = 0/n, where 0 is the wavelength of that light in vacuum.This assumes that the refractive index of vacuum is 1, and it also assumes that the refractive index has no impact on the wave's frequency (f = v/).To learn more about Refractive Index, refer to:
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A sample of gas has an initial volume of 8.90 L at a pressure of 825 mmHg. If the volume of the gas is increased to 14.7 L, what is its pressure (in atm)?
A sample of gas has an initial volume of 8.90 L at a pressure of 825 mmHg. If the volume of the gas is increased to 14.7 L, what is its pressure (in atm) is 0.65 atm.
According to boyle's law , we have
P1 V1 = P2 V2
P2 = (P1 V1 ) / V2
given that :
initial volume V1 = 8.90 L
pressure P1 = 825 mmHg = 1.08 atm
volume V2 = 14.7 L
solving the values in the formula , we get
P2 = (P1 V1 ) / V2
P2 = ( 1.08 × 8.90 ) / 14.7
P2 = 9.612 / 14.7
P2 = 0.65 atm
Thus, A sample of gas has an initial volume of 8.90 L at a pressure of 825 mmHg. If the volume of the gas is increased to 14.7 L, its pressure in atm is 0.65 atm.
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convert a mass of 8,467 cg to kg
Answer:
0.08467 kg
Explanation:
1 cg = 10^-5 kg
so 8,467 x 10^-5 = 0.08467 kg
What is the identity of a 10.0 g metal sample that increases by 14.0 C when 62.9 J of energy is absorbed?
(The answer is Iron but I can't for the life of me remember how to correctly work the problem to get to that answer and am mainly seeking help with that)
Au: 0.128
Ag: 0.235
Cu: 0.385
Fe: 0.449
Al: 0.903
Specific heat capacity of metal is the amount of heat that is required to raise the temperature of metal by 1 degree Celsius. The metals which has specific heat capacity of 0.449J/K/g is Iron. Thus correct option is option C
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of metal ×specific heat capacity of metal ×Change in temperature.
mass of metal= 10.0 g
change in temperature= 14.0° C =14K
specific heat capacity of metal=?
Q= enthalpy= 62.9 J
Substituting all the given values
specific heat capacity of metal= 62.9 J÷( 10.0 g × 14.0 K )
= 0.449J/K/g
Therefore the metals which has specific heat capacity of 0.449J/K/g is Iron. Thus correct option is option C
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A piece of wood that measures 3.0 cm by 6.0 cm by 9.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water?
Answer:
A. 0.49 g/cm3
B. Yes
Explanation:
Volume of wood = 3 x 6 x 9 = 162 cm3
d = m/V = 80.0/162 = 0.49382716049 = 0.49 g/cm3
Since density of water is 1 g/cm3, density of wood is less so it will float in water.
Photosystem II is responsible for the production of _______ from the splitting of water.Question 22 options: oxygen electrons carbon dioxide G3P
The question requires us to specify the product obtained when the Photosystem II splits water.
First, we need to remember that splitting water means "breaking" water into its components.
In that sense, water splitting is the chemical reaction where water is broken down into oxygen and hydrogen:
[tex]2H_2O\rightarrow2H_2+O_2[/tex]With that concept in mind, we can say that the photosystem II will produce oxygen (option A).
Another important thing to remember about this system is that it captures photons (the energy from the light) and uses this energy to extract electrons from water.
Solutions are found in many different places on earth, but one of the most common in our lives is soft drinks. Explain how a coke is a solution, how it is made, and how different factors like temperature and pressure can affect the character of asoft drink.
EXPLANATION:
Firstly, we need to define a solution
The solution is defined as a homogenous mixture of two or more substances in relative amounts that can be varied continuously.
Coke is an aqueous homogenous mixture of carbon dioxide, sugar, concentrate, etc The ingredient used in the production of coke are mixed in the right proportion and this make coke a homogenous solution
Temperature can affect the character of a coke. Carbonated soft drink tends to lose their fizz at high temperature. This is because as the temperature increases, the loss of carbon dioxide in the liquid will also increase.
Also, at high temperatures, the solubility of gases decreasese.
Determine the number of Na+ and SO4 2- ions required to form a neutral ionic compound. What is the formula for the ionic compound?
Answer:
Na2SO4
Explanation:
Na+ has +1 charge
(SO4)-2 has -2 charge
so it takes 2 Na+ to balance 1 (SO4)-2
therefore Na2SO4
What is the pH of a solution that is 0.49 M in sodium borate and 0.39 M in boric acid?
Report your answer to 2 decimal places.
The pH of a solution that is 0.49 M in sodium borate and 0.39 M in boric acid is 9.359.
What is the pH of a solution?Generally, Sodium borate and boric acid mixture in a buffer solution follows the below way:
Salt = Sodium borate =0.37
[tex][tex]\phi k_a[/tex]=5.4 *10^{-10}$[tex]-\log k_a\\=-\log 5.4 *10^{-10}$[/tex]p k a=9.26[tex]&\quad \\P H = P K \\a+\log \left|\frac{\text { Salt }}{\text { acid }}\right| \\[/tex]\\because [tex]P H=9.26+\log \left|\frac{0.49}{0.39}\right| \\\\=9.359[/tex]
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The most powerful laser in the world fires a pulse at 25 fempto seconds producing 30
terawatts of power. In physical sciences, power (watt) = Energy (J or kg•m2•s-2)/time (s).
If the average laser fires 7.5 x 1020 photons in a pulse, then what is the wavelength of the light fired in the world’s most powerful laser?
The most powerful laser in the world fires a pulse at 25 fempto seconds producing 30 terawatts of power in physical sciences, power (watt) =Energy (J or kg•m²×s⁻²)/time (s)if the average laser fires 7.5 x 10²⁰ photons in a pulse, then wavelength of the light fired in the world’s most powerful laser is 37×10⁻¹⁰ nm
A laser is the device that emit a beam of coherent light through an optical amplification process
Here given data is
Energy = time × power
Energy = 25 × 30
Energy = 750 J
Photons = 7.5 x 10²⁰
We have to calculate wavelength = ?
Then the formula is E =hcλ where E = energy, h = plank constant, c= speed, λ = wavelength
λ = hcE
λ = 6.62×10⁺³⁴×7.5 x 10²⁰ ×750 J
λ = 37×10⁻¹⁰ nm
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The question in the photo And Q2 is chemically baking soda is NaHco3 T or F
EXPLANATION
What are indicators; Chemical indicators are a substance that gives a visible sign of the presence or absence of a required concentration of a chemical substance.
Examples of indicators are; litmus paper, methyl orange, phenolphthalein
What is the main job of Excretory system?
Answer:
It's function is to remove wastes from the body
Explanation:
These wastes include water, carbon dioxide, nitrogen, salts, and heat. Metabolism: The process of the body converting food into energy. As a result, there are waste products.
3. What does this model show?
AA single type of atom bonded together
B An element because all the particles are the same
CA molecule because there is more than one type of atom
DAn element because there is more than one type of atom
HINT, HINT
Think about the definitio
atom, element, and mc
what these types of m
Answer:
A compound is a distinct group of atoms held together by chemical bonds. ... As we will now see, there are a variety of different ways to represent and draw
Explanation:
Please HELP!!!?! Describe competitive and noncompetitive in inhibitors describe how mutations can lead to resistance with non-competitive inhibitors
Competitive inhibitors - Binds to the enzyme in place of substrate by competing against the substrate
Non-competitive inhibitors - Binds to other position than the active site and blocks the activation of the enzyme without competing against the substrate
The mutations could change the shape of the binding site of non-competitive inhibitor thus preventing the binding.
Enzymes are proteins that could be activated if a substrate attaches itself to the receptor of the enzyme like a lock and key. The shape of the substrate should fit the receptor in the enzyme to activate it.
Inhibitors are structures similar to the substrate. It prevents the activation of the enzyme.
Competitive inhibitors are structures that binds to the enzyme in place of substrate i.e., it competes with the substrate to attach itself to the enzyme.
Non-competitive inhibitors are structures that does not compete with the substrate. In an enzyme, there may be more than one binding site. The non-competitive inhibitor would attach to other position and blocks the activation of the enzyme.
Mutations can change the structure of the molecule and thus the function. The mutations could change the shape of the binding site of non-competitive inhibitor thus preventing the binding. This would result in resistance of the enzyme with non-competitive inhibitor.
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Explain this statement
All group 1 metals react with cold water to form hydrogen and an alkali. The oxides of these metals are basic and their chlorides are soluble in water. The valency of each group 1 is one. Therefore the formula of its nitrate is MNO3
The formula should be MNO₃ because the valency of the metal and the nitrate ion both is 1 and thus the formula will be MN0₃.
Cold water causes a strong reaction between all alkali metals. Each time a reaction occurs, hydrogen gas is released along with the metal hydroxide. As you move down the group, the reaction gets faster and more violent. This demonstrates that as you move below Group 1, the alkali metals' reactivity rises.
Chlorides are created when any of the group 1 metals interact with chlorine. At room temperature, the chlorides are all white solids that dissolve to create a neutral solution. As you move down the group, the reactions get more forceful.
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the sentence or answer the question.
1. What kinds of particles were emitted by the radioactive source? What was there charge?
Find the sum of their masses, (1 Fe atom + 2 Cl atoms) for a single FeCl2 molecule, show your work:
The molar mass is 126.75 g/mol.
From the Periodic Table of Elements we can find the atomic mass of Fe and Cl:
- Fe atomic mass: 55.85 g/mol
- Cl atomic mass: 35.45 g/mol
So, the sum of their masses for a single FeCl2 molecule is:
1 Fe atom + 2 Cl atoms
1 x 55.85 g/mol + (2 x 35.45 g/mol)
55.85 g/mol + 70.9 g/mol
126.75 g/mol
So, the molar mass for a single FeCl2 molecule is 126.75 g/mol.
What is the percent abundance of the second and final isotope of lithium if first has a mass of
7.016004
and an abundance of
92.41%
The percent abundance of the second isotope of lithium that has a mass of 7.016004 and abundance of 92.41% is 6.465.
What is percent abundance?Isotopes are any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.
Thus, isotopes have the same atomic number but a different mass number.
The relative abundance of the isotope of an element is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.
According to this question, an isotope of lithium has a relative abundance of 92.41%. This means that the percentage abundance is calculated as follows:
92.41% × 7.016004 = 6.465amu
Therefore, 6.465 is the percentage abundance of the lithium isotope.
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