Answer:
CO3- is an example of a polyatomic ion.
Explanation:
Determine the empirical formula only for a certain copper sulfide ore if a 7. 68 grams sample of the compound contains 6. 13 grams of copper?
By finding the ratio of copper to sulfur and simplifying it to the lowest whole number ratio, we can determine the empirical formula of the compound.
To calculate the empirical formula, we first need to determine the masses of copper and sulfur in the given sample. Given that the sample contains 6.13 grams of copper, we subtract this mass from the total sample mass of 7.68 grams to find the mass of sulfur.
Mass of sulfur = Total sample mass - Mass of copper = 7.68 g - 6.13 g = 1.55 g
Next, we need to find the ratio of copper to sulfur by dividing the mass of each element by their respective atomic masses. The atomic mass of copper (Cu) is 63.55 g/mol, and the atomic mass of sulfur (S) is 32.07 g/mol.
Moles of copper = Mass of copper / Atomic mass of copper = 6.13 g / 63.55 g/mol
Moles of sulfur = Mass of sulfur / Atomic mass of sulfur = 1.55 g / 32.07 g/mol
Finally, we simplify the ratio of moles to the lowest whole number ratio to determine the empirical formula.
Learn more about empirical formula here:
https://brainly.com/question/32125056
#SPJ11
Para el elemento de Z-56 b, que formula minima tiene el compuesto que forma con 17-cl¿ c, que tipo de union hay en dicho compuesto¿ d, cual es la estructura de lewis del compuesto formado¿
Answer:
ver explicacion
Explanation:
El elemento que tiene el número atómico 56 en la tabla periódica del bario. El bario es un elemento del grupo dos.
Se combina con el cloro para formar cloruro de bario. que tiene la fórmula BaCl2 de acuerdo con la valencia de ambos elementos.
El cloruro de bario es un compuesto iónico.
is H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l) a combustion
name some examples of chemical solutions and maybe give a clear explanation as to what chemical solutions are
Answer:
Some examples of solutions are salt water, rubbing alcohol, and sugar dissolved in water. ... In our example of salt water, the solute is the salt. Solvent: this is the substance that makes up the majority of the solution. This is the part where the solute is dissolved.
Explanation:
I hope they should be right answer
why is OH on the outside of the lewis structure for methanol?
In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.
The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.
The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.
In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.
know more about valence electrons here:
https://brainly.com/question/371590
#SPJ8
The hydrogen atom has a volume of approximately . What is this volume in each unit?
(a) cubic picometers
(b) cubic nanometers
(c) cubic angstroms (1 angstrom = )
a) The volume of a hydrogen atom in cubic picometers is approximately 0.704 * 10^-27 pm^3.
b) The volume of a hydrogen atom in cubic nanometers is approximately 0.704 * 10^-27 nm^3.
c) The volume of a hydrogen atom in cubic angstroms is approximately 0.704 Å^3.
What do you mean by hydrogen?
Hydrogen is the chemical element with the symbol H and atomic number 1. It is the most abundant element in the universe, making up about 75% of its elemental mass. Hydrogen is a colorless, odorless, and tasteless gas, and it is the lightest element in the periodic table.
Hydrogen has a number of important industrial applications, including use in the production of ammonia, methanol, and other chemicals. It is also used as a fuel for rockets and other forms of transportation, and is being explored as a potential energy source for powering vehicles and homes. In its liquid and solid forms, hydrogen is used as a coolant in nuclear reactors.
The volume of a hydrogen atom can be calculated using the formula for the volume of a sphere:
V = (4/3) * π * r^3
where r is the radius of the hydrogen atom.
The radius of a hydrogen atom is approximately 0.53 angstroms, so we can substitute this value into the formula and calculate the volume in each unit:
(a) cubic picometers:
1 pm = 10^-3 angstroms
V = (4/3) * π * (0.53 angstroms)^3 = 0.704 cubic angstroms
V in pm^3 = 0.704 * (10^-3 angstroms/pm)^3 = 0.704 * 10^-27 pm^3
Therefore, the volume of a hydrogen atom in cubic picometers is approximately 0.704 * 10^-27 pm^3.
(b) cubic nanometers:
1 nm = 10 angstroms
V = (4/3) * π * (0.53 angstroms)^3 = 0.704 cubic angstroms
V in nm^3 = 0.704 * (10 nm/angstroms)^3 = 0.704 * 10^-27 nm^3
Therefore, the volume of a hydrogen atom in cubic nanometers is approximately 0.704 * 10^-27 nm^3.
(c) cubic angstroms:
V = (4/3) * π * (0.53 angstroms)^3 = 0.704 cubic angstroms
Therefore, the volume of a hydrogen atom in cubic angstroms is approximately 0.704 Å^3.
Learn more about volume of Hydrogen click here:
https://brainly.com/question/28441952?source=archive
#SPJ1
A chemist burns 100. 0 g of chromium (Cr) in excess oxygen. There is only one product, and it has a mass of 192. 31 g.
What is the empirical formula of the product?
The empirical formula of the compound (chromium oxide) formed when 100 grams of chromium is heated in the presence of excess oxygen is CrO₃
How do I determine the empirical formula?The chemical formula of a compound that gives the proportions (ratios) of the elements present in the compound but not the precise number or arrangement of atoms is known as an empirical formula.
We'll start by figuring out how much oxygen is in the compound. Below is an example of this.
Mass of chromium = 100 grams
Mass of compound = 192.31 grams
Mass of oxygen =?
Mass of oxygen = (Mass of product) - (Mass of chromium)
Mass of oxygen = 192.31- 100
Mass of oxygen = 92.31 grams
Mass of chromium (Cr) = 100 grams
Mass of oxygen = 32.31 grams
Empirical formula = ?
Divide by their molar mass
Cr = 100/52 = 1.9
O =92.31/16 = 5.7
Divide by the smallest
Cr = 1.9/1.9 = 1
Br = 5.7/1.9 = 3
To know more about empirical formula visit:
https://brainly.com/question/29402093
#SPJ4
If 60g of m combines with 24g of oxygen what would be the empirical formula of the oxide (o=16,m=120)
The empirical formula of the oxide-containing 60 g of M and 24 g of oxygen is MO₃.
What is an empirical formula?A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule \(CH_2O\) is the empirical formula for glucose.
Data obtained from the question
M = 60 g
O = 24 g
Empirical formula =?
How to determine the empirical formula
Divide by their molar mass
M = 60÷120 = 0.5
O = 24 ÷16 = 1.5
Divide by the smallest
M = 0.5÷0.5 = 1
O = 1.5 ÷0.5 = 3
Thus, the empirical formula of the oxide is MO₃
Learn more about the empirical formulas:
brainly.com/question/24297883
#SPJ1
Which statement accurately describes humidity?
O Humidity is a measure of dew in the air.
O Colder air promotes more evaporation.
O Cold air holds more moisture than warm air.
O Humidity refers to the amount of water vapor in the air.
Humidity refers to the amount of water vapor in the air accurately describes it.
What is Water vapor?This can be defined as the gaseous phase of water as a result of heating in the atmosphere.
The amount of the water vapor in air is what is referred to as humidity which makes option D the most appropriate choice.
Read more about Humidity here https://brainly.com/question/5369085
Predict the products of the following reactants: Cu + AlCl3 -->
A. 3Cu + 2AlCl3 --> 3CuCl2 + 2Al
B. Cu + AlCl3 --> CO2 + H2O
C. Cu + AlCl3 --> AlCuCl3
D. No reaction will occur
Option A. 3Cu + 2AlCl3 --> 3CuCl2 + 2Al is correct.
The products of the reactants Cu + AlCl3 are 3CuCl2 and 2Al. This is a single replacement reaction, in which the copper metal is replaced by the aluminum ions in the aluminum chloride compound, forming copper chloride and aluminum metal.
What are reactants?In a chemical reaction, reactants are substances or elements that interact with or combine with another substance or element (the process of transformation of chemical substances). Typically, these are at the start of the arrows in chemical processes. To further grasp the word, let's look at an example of a chemical equation (a symbol for a chemical reaction).
Water is created when hydrogen and oxygen are combined.
The chemical makeup of water is shown in the aforementioned reaction. A chemical reaction's arrow denotes the direction in which the reaction takes place. This is how the equation would seem if we used the scientific names for its components.
To know more about reactants visit:
https://brainly.com/question/17096236
#SPJ1
A specialty food store received orders for 725 fruit baskets during the 7-day period leading up to a major holiday. According to the fruit basket recipe shown, how many strawberries will the specialty store need to fulfill all 725 orders? 1 fruit basket = 4 oranges (O) + 3 apples (A) + 2 pears (P) + 6 strawberries (S) 1 fruit basket = 4O + 3A + 2P +6S ⟶ O4A3P2S6
The fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
What is fruit basket?Fruit basket is defined as a gift basket filled with a variety of fruits.
A fruit basket can be called as a punnet is a compact box or square basket used for gathering, transporting, and selling fruits and vegetables, typically for small berries.
As one basket has 6 strawberries.
So, for completing 725 order we need
= 725 / 6
= 120.8 = 120 strawberries
Thus, the fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
To learn more about fruit basket, refer to the link below:
https://brainly.com/question/26073272
#SPJ1
zinc + lead(IV) chloride makes what
Answer:
2Zn + PbCl4 → 2ZnCl2 + Pb
N.B: ZnCl2 is zinc chloride
Pb is lead
Explanation:
Zinc has a chemical symbol Zn while lead(IV) chloride has the chemical formula, PbCl4. Combining these two substances in a reaction will give rise to the following:
Zn + PbCl4 → ZnCl2 + Pb
However, this equation is not balanced. To balance the equation, we make sure that the atoms of each element on both sides of the reaction are equal. This is done as follows;
2Zn + PbCl4 → 2ZnCl2 + Pb
N.B: ZnCl2 is zinc chloride
Pb is lead
How many individual decay steps are in the decay chain of uranium-238 before the stable end product of lead-206 is produced?
When stable lead-206 is produced by the radioactive decay of uranium-238, it passes through a 14-step radioactive decay series. There are eight and six decays in this sequence.
What is radioactive decay ?Ionizing radiation is released as a result of radioactive decay. Ionizing radiation offers a health concern by destroying tissue and the DNA in genes because it can damage the atoms in living things.
The decay chain is the collection of decay products produced to achieve this equilibrium. For instance, after producing intermediates like Uranium-234, Thorium-230, Radium-226, and Radon-222, the decay chain starting with Uranium-238 ends in Lead-206. Known as the "decay series" as well.
The daughter nucleus, thorium 234, is created by the alpha emission of a uranium 238 nuclei. This thorium then changes into protactinium 234 and experiences beta-negative decay to yield uranium 234 as a byproduct.
Thus, When stable lead-206 is produced by the radioactive decay of uranium-238, it passes through a 14-step radioactive decay series.
To learn more about radioactive decay, follow the link;
https://brainly.com/question/1770619
#SPJ1
most elements are (1) metals (2)nonmetals (3)gases (4)made in labs
If the temperature remains constant and pressure is INCREASED on gas, what will happen to the volume?
The volume will increase.
The volume will decrease.
The volume will not change.
The volume will randomly increase and decrease, and keep doing this.
Answer:
I believe the volume should increase.
83.0 g Lithium Cyanide (LiCN)
Can someone please convert this to molar mass and moles for 100point?
it's not a scam like I really need this done before class is done
Molar mass:-
\(\\ \sf\longmapsto LiCN\)
\(\\ \sf\longmapsto 7u+12u+14u\)
\(\\ \sf\longmapsto 21u+12u\)
\(\\ \sf\longmapsto 33u\)
\(\\ \sf\longmapsto 33g/mol\)
Given mass=83gNo of moles=Given Mass/Molar mass
\(\\ \sf\longmapsto \dfrac{83}{33}\)
\(\\ \sf\longmapsto 2.5mol\)
a student balanced the chemical equation for the reaction of magnesium with oxygen by writing Mg + O2 ----> MgO2. What is wrong with this equation?
Answer:
Explanation:
Magnesium when it oxidizes has a valence of 2.
Oxygen, when it mixes with something, has a valence of - 2
So Mg and O2 will form something, but what? The answer is MgO
Mg + O2 ===> MgO
To balance this equation, you need 2 Magnesiums on the right and 2 Oxygens also on the right. The left will need a two Magnesiums.
The balanced equation will be
2Mg + O2 ====> 2MgO
the bond between adjacent amino acids is a(n) ________ bond.
The bond between adjacent amino acids is a covalent peptide bond. A protein is made up of a lengthy chain of amino acids that are connected by peptide bonds.
A water molecule is removed during a biological process that links the carboxyl group of one amino acid to the amino .Peptide bonds are the connected that hold the amino acids of a peptide together in a particular order. Two atoms share an electron pair equally in a covalent link. Peptide (amide) and disulfide links between amino acids, as well as C-C, C-O, and C-N bonds within amino acids, are examples of significant covalent bonds.
To learn more about peptide bond, click here.
https://brainly.com/question/28295128
#SPJ4
How many moles of N2 is in a flask with a volume of 500L at a pressure of 300. 0 kPa and a temperature of 500. 0 K?
R = 8. 31 kPa ּ L / molּ K
There are 51.75 moles of N2 in a flask with a volume of 500 L at a pressure of 300.0 kPa and a temperature of 500.0 K.
To calculate the number of moles of N2, we can use the ideal gas law equation:
\(PV = nRT\)
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
First, we convert the pressure from kPa to atm:
300.0 kPa = 300.0 kPa × (1 atm / 101.3 kPa) ≈ 2.962 atm
Next, we convert the temperature from Kelvin to Celsius:
500.0 K = 500.0 K - 273.15 ≈ 226.85 °C
Then, we convert the volume from L to dm³:
500 L = 500 dm³
Now, we can plug the values into the ideal gas law equation:
(2.962 atm) × (500 dm³) = n × (8.31 kPa·L/mol·K) × (226.85 °C + 273.15)
Solving for n, we find:
n = (2.962 atm × 500 dm³) / (8.31 kPa·L/mol·K × 500.00 K)
n ≈ 51.75 moles
Therefore, there are approximately 51.75 moles of N2 in the flask with a volume of 500 L at a pressure of 300.0 kPa and a temperature of 500.0 K.
Learn more about temperature here
https://brainly.com/question/30289343
#SPJ11
Round the number 6845 into three significant figures.
a 6800
b 6850
C 7000
d 6846
Answer:
c
Explanation:
if you count the last three digits from the back i.e. 6. 8, 4, 5. since it is to THREE significant figures. The next number is 6, and since 6 is greater than 5, you round it up to 7. The digits 8,4,5 will turn to 000.
Therefore 6845 = 7000
Describe two patterns in the periodic table?
Answer:
Patter 1: Ionization Energy Decreases going down a group
Pattern 2: Ions tend to gain/lose the least amount of electrons
Take oxygen, for example. Oxygen has 8 electrons. To become like a noble gas it could either gain two to become like neon or it could lose six to become like helium. So what will oxygen do—gain two or lose six? As a general rule, atoms will gain or lose the fewest number of electrons possible.
Explanation:
A chemistry needs a small amount of potassium to carry out an experiment in the lab. She discovered that there is no potassium available. Which of the following elements would be the best available replacement? A. calcium B. magnesium C. sodium D. bromine
The element that we can be able to use for the experiment in place of potassium is sodium.
What is the best replacement for the potassium?We know that the elements that can be found in the same group does react in the same way. Now we know that we have to look about among the options so that we would be able to know element that is in the same group as potassium.
Given that both sodium and potassium are members of group 1, we have to look out for the element that element thus we have to select sodium.
Learn more about group of elements:https://brainly.com/question/5460947
#SPJ1
9. Which statements about mixtures is FALSE? Select ALL that apply.
they are all mixed uniformly and have an even composition throughout
the components keep their physical properties
substances must combine in specific proportions
mixtures can be separted using physical properties.
Answer:
they are all mixed uniformly and have an even composition throughout, substances must combine in specific proportions
Explanation:
-only homogenous mixtures are uniformly mixed
-mixtures comprise of 2 of more substances mixed in any proportion.
-mixtures have the same properties as their constituent elements
-mixtures are separated by physical processes
theres a diff one of my question
What advancements helped develope the cell theory? (5 points)
a
thermometer
b
flask
c
microscope
d
scale
a geochemist in the field takes a small sample of the crystals of mineral compound from a rock pool lined with more crystals of . he notes the temperature of the pool, , and caps the sample carefully. back in the lab, the geochemist dissolves the crystals in of distilled water. he then filters this solution and evaporates all the water under vacuum. crystals of are left behind. the researcher washes, dries and weighs the crystals. they weigh .
Yes. Solubility is 0.070 kg/L
Solution:
Solubility = mass / Volume
Solubility = (0.210kg)/(3L) = 0.070 kg/L
Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.
Adding sugar cubes to your tea or coffee is a common example of a solution. The ability of a sugar molecule to dissolve easily is called solubility. The term solubility can therefore be defined as the property of a substance to dissolve in a particular solvent. Water solubility is a measure of the amount of a chemical that can be dissolved in water at a given temperature.
Learn more about Solubility here:- https://brainly.com/question/23946616
#SPJ4
Larisa pumps up a soccer ball until it has a gauge pressure of 61 kilopascals. The volume of the ball is 5.2 liters. The air temperature is 32°C, and the outside air is at standard pressure. How many moles of air are in the ball?
A. 0.13 mol
B. 0.33 mol
C. 1.2 mol
D. 3.2 mol
The number of mole of air in the ball, given that the volume of the ball is 5.2 litres is 0.13 mole (Option A)
How to determine the number of mole of airWe'll begin by listing out the given parameters from the question. This is given below:
Pressure (P) = 61 kilopascalsVolume (V) = 5.2 litresTemperature (T) = 32 °C = 32 + 273 = 305 KGas constant (R) = 8.314 L.KPa/Kmol Number of mole (n) =?From the above parameters, we can obtain the number of mole as follow
PV = nRT
61 × 5.2 = n × 8.314 × 305
317.2 = n × 2535.77
Divide both sides by 2535.77
n = 317.2 / 2535.77
n = 0.13 mole
Thus, the number of mole is 0.13 mole (Option A)
Learn more about number of mole:
https://brainly.com/question/16259909
#SPJ1
which of your body structures was the effector in the reaction time test? what was your motor response?
Skeletal muscle was the Effector in the reaction time test and motor response reflects the muscular component of reaction time.
The Effector in the reaction time test was the skeletal muscle in the finger which is used to press the button. muscle and glands produces a specific response to a stimuli's and the motor response was reaction time test is the time between electromyographic activity and movement and the motor response is the response which reflects the skeletal muscle component of reaction time.
learn more about Effector
brainly.com/question/3190796
#SPJ4
1)26.4 % Carbon
3.3 % Hydrogen
70.3 % Oxygen
Molar Mass: 91.0 g/mol
Empirical Formula:
Molecular Formula:
Answer:
1. Empirical formula => CH2O2
2. Molecular formula => C2H4O4
Explanation:
From the question given above, the following data were obtained:
Carbon (C) = 26.4 %
Hydrogen (H) = 3.3 %
Oxygen (O) = 70.3 %
Molar mass of compound = 91.0 g/mol
Empirical formula =..?
Molecular formula =..?
1. Determination of the empirical formula of the compound.
C = 26.4 %
H = 3.3 %
O = 70.3 %
Divide by their molar mass
C = 26.4 /12 = 2.2
H = 3.3 /1 = 3.3
O = 70.3 /16 = 4.39
Divide by the smallest
C = 2.2 /2.2 = 1
H = 3.3 /2.2 = 2
O = 4.39 /2.2 = 2
Empirical formula => CH2O2
2. Determination of the molecular formula of the compound.
Molar mass of compound = 91.0 g/mol
Empirical formula => CH2O2
Molecular formula => [CH2O2]n
We shall determine the value of n as follow:
[CH2O2]n = 91
[12 + (2×1) + (2×16)]n = 91
[12 + 2 + 32]n = 91
46n = 91
Divide both side by 46
n = 91/46
n = 2
Molecular formula => [CH2O2]n
Molecular formula => C2H4O4
In the given case where 26.4 % Carbon , 3.3 % Hydrogen , 70.3 % Oxygen , and Molar Mass: 91.0 g/mol the:
Empirical Formula: \(C_2H_3O_4\) Molecular Formula: (\(C_2H_3O_4\))\(_1\)Given:
Carbon (C) = 26.4 %
Hydrogen (H) = 3.3 %
Oxygen (O) = 70.3 %
Molar mass of compound = 91.0 g/mol
Determination of the empirical formula of the compound:-
Divide by their molar mass for obtaining moles: C = 26.4 /12 = 2.2 H = 3.3 /1 = 3.3 O = 70.3 /16 = 4.39 for ratio Divide by the smallest: C = 2.2 /2.2 = 1 H = 3.3 /2.2 = 1.5 O = 4.39 /2.2 = 2
The ratio is CHO = 1 : 1.5 : 2
multiply with 2 to find correct and complete number ratio
C = 1 × 2 = 2
H = 1.5 × 2 = 3
O = 2 × 2 = 4
Thus, the Empirical formula => \(C_2H_3O_4\)
Mass × n = molar mass
12 × 2 + 1 × 3 + 16 × 4 = 91
24 + 3 + 64 = 91
91 = 91
Thus moles are 1 which means
molecular formula = (\(C_2H_3O_4\))\(_1\)
Thus, here in the given data:
Empirical Formula: \(C_2H_3O_4\)Molecular Formula: (\(C_2H_3O_4\))\(_1\)
Learn more:
https://brainly.com/question/15960587
There are three stable isotopes of magnesium. Their masses are 23.9850, 24.9858, and 25.9826 u. If the average atomic mass of magnesium is 24.3050 u and the natural abundance of the lightest isotope is 78.99%, what are the natural abundances of the other two isotopes?
Answer:
²⁵ Mg = 10.00%
²⁶ Mg = 11.0%
Explanation:
Given that:
Magnesium ²⁴Mg has an abundance of 78.99%
Hence, (100 - 78.99)% = 21.01%
21.01% is the abundance of ²⁵ Mg and ²⁶ Mg
Suppose,
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
Then;
avg. atomic mass = \(\dfrac{78.99}{100 }(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)\)
where the avg. atomic mass = 24.3050
∴
\(24.3050 \times 100 = {78.99}(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)\)
2430.5 = 2440.46915 -0.9968 x
0.9968x = 2440.46915 - 2430.5
0.9968x = 9.96915
x = 9.96915/0.9968
x = 10.00%
∴ Recall that:
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
²⁵ Mg = 10.00%
²⁶ Mg = (21.01 - 10.00)%
²⁶ Mg = 11.0%
The natural abundances of the other two isotopes, that is, Mg-25 and Mg-26 are 10% and 11.01%.
What is Natural abundance?It is the abundance of isotopes of a chemical element as naturally found on a planet.
Based on the given information:
The three stable isotopes of Mg are Mg-24, Mg-25 and Mg-26. The natural abundance of the lightest isotope, that is, Mg-24 is 78.99%. The masses of the isotopes are 23.9850 u, 24.9858 u and 25.9826 u. The average atomic mass of Mg is 24.3050 u.Now the natural abundance of all the isotopes of Mg is 100%.
Mg-24 + Mg-25 + Mg-26 = 100
Mg-25 + Mg-26 = 100-78.99
Mg-25 + Mg-26 = 21.01
Now let us assume that Mg-25 is x% then Mg-26 will be (21.01% -x).
Now,
Average atomic mass of Mg = [(Natural abundance of Mg-24) × (isotopic mass of Mg-24) + (Natural abundance of Mg-25) × (Isotopic mass of Mg-25) + (Natural abundance of Mg-26) × (Isotopic mass of Mg-26)]
Putting the values we get,
24.3050 amu = (78.99% × 23.9580 amu) + (x% × 24.9858 amu) + (21.01% - x%) × 25.9826 amu
24.3050 amu = 18.9458 + 24.9858 × x + 5.4589 - (25.9826x)
24.3050 = 24.4047 - (0.9968x)
0.9968x = 24.4047 - 24.3050
x = 0.1000
x = 10%
The natural abundance of Mg-25 is 10%.
The natural abundance of Mg-26 = 21.01% - x% = 21.01% - 10% = 11.01%.
Thus, the natural abundances of the other two isotopes are 10% and 11.01%.
Find out more information about natural abundances here:
https://brainly.com/question/4880347
Which two of the following phrases describing the synthesis of amino acids are accurate?
1. Lysine is an essential amino acid and is synthesized in the human boy by the transamination of alpha-ketoglutarate.
2. Synthesis of the amino acid alanine involves reduction (that is, the precursor is reduced) its degradation involves oxidation
3. The carbon sources for nonessential amino acid synthesis include metabolic pathway intermediates and alpah-keto acids.
4. The synthesis of alanine from pyruvate, an alpah-keto acid, involves the oxidation of pyruvate.
5. The carboxyl groups of all the non essential amino acis are derived from glutamate.
2,5 are the two phrases describing the synthesis of amino acids are accurate.
Alpha-ketoglutarate is transaminated in the human body to produce lysine, an important amino acid. The precursor is reduced during the amino acid alanine's synthesis, and oxidation occurs during alanine's breakdown.
The precursor is reduced during the amino acid alanine's synthesis, while oxidation occurs during alanine's breakdown. Metabolic pathway intermediates and alpha-keto acids are the carbon sources for the production of non-essential amino acids.
To learn more about amino acid please click on below link
https://brainly.com/question/28409615
#SPJ4