Answer:
C9H13O3N
Explanation:
Take the atomic mass of C=12.0, H=1.0, O=16.0 and N=14.0.
We can draw a chart (please view this on desktop so to avoid spacing errors):
Let the mass of Epinephrine be 100g.
C H O N
mass(g) : 59 7.15 26.2 7.65
no. of moles : 59/12 =4.9167 7.15/1 = 7.15 26.2/16=1.6375 7.65/14=0.5464
(n.o.m. = mass/molar mass)
Ratio: 4.9167/0.5464 =9 7.15/0.5464=13 1.6375= 3 0.5464/0.5464 =1
(divide the n.o.m. by the smallest n.o.m., which is 0.5464 in this case, take the whole numbers)
So, the empirical formula will be: C9H13O3N
But this is still not yet the molecular formula. We have to ensure the molar mass is 183g/mol. Multiply the empirical formula by n.
So, let the molecular formula of Epinephrine be (C9H13O3N)n.
12x9n + 1x13n + 16x3n + 14n = 183
108n + 13n + 48n + 14n = 183
183 n = 183.
n = 1
Hence, the molecular formula is C9H13O3N.
How many moles of ZnCl2 will be produced from 61.0 g of Zn, assuming HCl is excess?
Answer: 0.938 moles of [tex]ZnCl_2[/tex] will be produced.
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
moles of zinc:
[tex]\text{Number of moles}=\frac{61.0g}{65g/mol}=0.938moles[/tex]
[tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
As HCl is in excess , zinc is the limiting reagent and it limits the formation of product.
According to stoichiometry :
1 mole of Zn produce = 1 mole of [tex]ZnCl_2[/tex]
Thus moles of Zn produce = [tex]\frac{1}{1}\times 0.938=0.938[/tex] moles of [tex]ZnCl_2[/tex]
Thus 0.938 moles of [tex]ZnCl_2[/tex] will be produced.
what does a metreologist study
Answer:
A meteorologist studies meteorology which is the study of the atmosphere in order to predict/forecast the weather.
Explanation:
I hope this helps.
Answer:
they study the atmosphere and atmospheric events of our weather
Explanation:
Describe the crystallization process as applied in salt preparation
Explanation:
The principle used in the preparation of these salts is to dissolve
the cystine in an alcoholic alkali solution to which just sufficient
water to effect solution has been added, and, after filtering from
excess cystine, to precipitate the salt by addition of a suitable
indifferent solvent. While various solvents, such as acetone,
ether, or large amounts of alcohol caused precipitations, these were
either oily or amorphous. Only acetonitrile was found to possess
the power of initiating regular crystallization in the salt solutions.
While the solutions of the different salts require different amounts
of the solvent for complete precipitation, a partial substitution of
absolute ether for acetonitrile was found expedient in the case
of the most soluble of the salts, the K salt.
Answer:
It is simply a process of forming crystal.
Explanation: When salt is heated and dissolve in the liquid mainly water then its called saturated solution. When we further add salt and increase heat in order to dissolve it then it forcibly dissolve in liquid it's called supersaturated solution. After we slowly cool down the temperature then the salt we have put in supersaturated solution arises in the form of crystal. Hence its called crystalization.
MARKING BRAINLIEST!! - Determine the molar mass [MM] of a gas if 2 L of the gas weights 0.500 g at 298 K and 2.00 atm.
Answer:
3.125g/mol
Explanation:
To find the molar mass of the gas, we need to initially find the number of moles (n) contained in the gas. To find the number of moles, we use the general gas law whose equation is:
PV=nRT
Where; P= Pressure
V= Volume occupied by gas
n= number of moles
R= general gas constant
(0.0821 L atm mol/K)
T= absolute temperature
According to the question; P= 2.0atm, V= 2.0L, n= ?, T= 298K
To find n, we make it the subject of the formula:
n= PV/RT
n= 2.0 × 2.0 / 0.0821 × 298
n= 4/ 24.4658
n= 0.16mol
If number of moles (n) of the gas is 0.16mol and it weighs 0.500g, its molar mass can be found using:
number of moles (n) = mass (g) / molar mass
Making MM subject of the formula;
molar mass = mass / number of moles
MM= 0.500/0.16
MM= 3.125
Hence, the molar mass of the gas is 3.125g/mol.
Give one reason why water gas and producer gas are prepared together in the same furnace. Pls ansa its urgent
Answer:
because water gas has high heat content more than producer gas
Explanation:
give brainliest plz
Name the layer where the pressure is 3.5 million atmospheres:
Answer:
The Inner Core
hope it was useful
stay at home stay safe
keep rocking
pls mark me as brani
........
Based on the kinetic molecular theory, which of the following statements is correct about the particles in a sample of gas at a constant temperature and
volume?
They have negligible kinetic energy
They attract each other with strong forces.
There is a lot of empty space between them.
Their net kinetic energy decreases due to collisions.
Answer:
There is a lot of empty space between them.
Explanation:
The kinetic molecular theory postulates that a substance is made up of tiny particles called molecules. The molecules of a gas are in constant random motion and collide elastically with each other. They also collide with the walls of the container.
The magnitude of intermolecular forces of attraction between gas molecules is very small. Hence gas molecules are largely apart with a lot of empty space between gas molecules.
Answer:C, There is a lot of empty space between them.
Explanation:
Which of the outer planets is MOST like Earth? How?
Answer:
venus
Explanation:
hope i helped
brainliest pls pls pls
-Zylynn
Answer: I would say that Saturn is most like Earth. Not only does it have moons, like Earth, but the atmosphere is also denser like Earth. It also has windstorms, granite they are much more intense than Earth’s, but they do indeed happen. Saturn also has hydrogen gas; this gas is here on Earth supporting life in our ocean. Therefore, there is a chance that the conditions on Saturn could provide the essentials for there to be life.
The image shows information about the element carbon as it appears in the periodic table. Based on the image, which statement is accurate? A. A carbon atom has two protons, two neutrons, and two electrons. B. A carbon atom has three protons, six neutrons, and three electrons. C. A carbon atom has six protons, six neutrons, and six electrons. D. A carbon atom has four protons, four neutrons, and four electrons.
Answer:
C. A carbon atom has six protons, six neutrons, and six electrons.
Explanation:
Carbon has a relative atomic mass of 12 and an atomic number of 6. We must recall that the atomic number of an atom is the number of protons in that atom. The atomic number is also the same as the number of electrons in the neutral atom of that element.
To ensure electrical neutrality of the atom, the number of protons in the atom must be equal to the number of electrons in the atom.
The mass number of an atom is the sum of the number of protons and neutrons present in the atom. Since carbon has a mass number of 12, then there must be six neutrons present in the atom.
According to the electronic configuration and structure of atom statement which is true is that a carbon atom has six protons, six neutrons, and six electrons.The correct option is C.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
The carbon atom has atomic number '6' giving it six electrons and six protons and neutrons each.Thus, option 'C' is correct.
Learn more about atom,here:
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how many sigma and pi bonds in propionic bond
A container initially holds 5.67 x 10^-2 mol of propane and has a volume of V1. The volume of the container was increased by adding an additional 2.95 x 10^-2 mol if propane to the container, so that the container has a final volume of 1.93 L. If the temperature and pressure are constant, what was the initial volume of the container?
Answer:
Initial volume of the container (V1) = 1.27 L (Approx)
Explanation:
Given:
Number of mol (n1) = 5.67 x 10⁻²
Number of mol (n2) = (5.67 +2.95) x 10⁻² = 8.62 x 10⁻²
New volume (V2) = 1.93 L
Find:
Initial volume of the container (V1)
Computation:
Using Avogadro's law
V1 / n1 = V2 / n2
V1 / 5.67 x 10⁻² = 1.93 / 8.62 x 10⁻²
V1 = 10.9431 / 8.62
Initial volume of the container (V1) = 1.2695
Initial volume of the container (V1) = 1.27 L (Approx)
Answer: 1.27 L
Explanation:
First, calculate the final number of moles of propane (n2) in the container.
n2 = n1 + nadded = 5.67 × 10^−2 mol + 2.95 × 10^−2 mol = 8.62 × 10^−2 mol
Rearrange Avogadro's law to solve for V1.
V1 = V2 × n1 / n2
Substitute the known values of n1, n2, and V2,
V1 = 1.93 L × 5.67 × 10^−2 mol / 8.62 × 10^−2 mol = 1.27 L
How fast do sound waves travel under normal conditions? A. 110 feet each second B. 1100 miles per hour C. 1100 feet each second D. 1100 miles each second
Answer:
110 feet each second......
I think
Answer:
110 hope its right
Explanation:
In the reaction MgCl2 + 2KOH → Mg(OH)2 + 2KCI, how many grams of KOH
react with 1 mole of MgCl2?
A. 95 g
B. 56 g
C. (1/2)(56 g)
O D. (2)(56 g)
Answer:
The correct option is;
D. (2)(56 g)
Explanation:
MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl
From the balanced chemical reaction equation, we have;
One mole of MgCl₂ reacts with two moles of KOH to produce one mole of Mg(OH)₂ and 2 moles of KCl
Therefore, the number of moles of KOH that react with one mole of KCl = 2 moles
The mass, m, of the two moles of KOH = Number of moles of KOH × Molar mass of KOH
The molar mass of KOH = 56.1056 g/mol
∴ The mass, m, of the two moles of KOH = 2 moles × 56.1056 g/mol = 112.2112 grams
The amount in grams of KOH that react with one mole of MgCl₂ = 112.2112 grams ≈ 112 grams = (2)(56 g).
Answer:
the answer is D
Explanation:
good luck
When Niels Bohr refined the model of an atom,what new idea did he include?
Answer:
Niels Bohr, refined the model of an atom by proposing a quantized shell structure atomic model in order to describe how the electrons are able to maintain stable orbits around the nucleus
Based on the predictions of classical mechanics the electron motion of the Rutherford model was unstable as the electrons where expected to have lost some energy during motion and thus having to come rest in the nucleus
According to the modification by Neils Bohr in 1913, electrons move in shells or orbits of fixed energy and emission of electromagnetic radiation takes place only when electrons changes the orbit in which they move
Explanation:
What is the electron configuration of chlorine (Cl)?
1s22s22p63s23p3
1s22s22p63s23p5
1s22s22p63s24s23p3
1s22s22p63s23p23d3
Answer:
b) 1s22s22p63s23p5
Explanation:
Answer:
b) 1s22s22p63s23p5
Explanation:
edge 2021
Which of the following would NOT be a conversion factor for mole to mole calculations for the following reaction: 2Al + 3Cl2 --> 2AlCl3
A: 3 mol Cl2 3 mol Al
B: 2 mol Al 3 mol Cl2
C: 2 mol AlCl3 2 mol Al
D: 3 mole Cl2 2 mol AlCl3
Answer: A. 3 mol [tex]Cl_2[/tex] 3 mol Al:
Explanation:
Te given balanced chemical equation is :
[tex]2Al+3Cl_2\rightarrow 2AlCl_3[/tex]
According to the stochiometry :
A: 3 mol [tex]Cl_2[/tex] 3 mol Al:
3 moles of chlorine reacts with 2 moles of aluminium
B. 2 mol [tex]Al[/tex] 3 mol [tex]Cl_2[/tex]:
2 moles of aluminium reacts with 3 moles of chlorine
C. 2 mol [tex]AlCl_3[/tex] 2 mol Al
2 mol of aluminium produces 2 mol of [tex]AlCl_3[/tex]
D. 3 mol [tex]Cl_2[/tex] 2 mol [tex]AlCl_3[/tex]
3 moles of chlorine produces with 2 moles of [tex]AlCl_3[/tex]
Thus the conversion factor not used for mole to mole calculations is 3 mol [tex]Cl_2[/tex] 3 mol Al:
what kind of a compounds act as an electrolyte? explain with and example
Answer:
ionic compounds
Explanation:
just finished ap chem
Answer:
An ionic compound can act as an electrolyte. This is because an electrolyte should allow charges to travel inside it.
e.g = H2SO4, NaCl
Explanation:
HELPSS!
Isopropyl alcohol has a density of 0.785g/ml at 25°C. How much is contained in a 150ml sample of this alcohol?
Answer:
The amount of isopropyl alcohol contained in 150 ml of the solution is 117.15 grams
Explanation:
The density of a substance is the mass per unit volume, therefore, we have;
The density of the isopropyl alcohol = 0.785 g/ml at 25°C
The density = mass/volume
Mass = Density × Volume
The mass of the 150 ml of isopropyl alcohol is therefore;
Mass = 0.785 g/ml × 150 ml = 117.15 g
The amount in grams contained in 150 ml of sample = 117.15 g.
An antacid tablet has a pH of about 9.5 which
means it is considered to be in the _____
range.
Acidic or basic
Answer:
Basic
Explanation:
The pH scale is a scale that tells us about the concentration of hydrogen ions in a solution.
Acids have many hydrogen ions. Acids have a pH of less than 7.
Bases have fewer hydrogen ions and more hydroxide ions. Bases have a pH of less than 14.
If the solution has a pH of exactly 7, then it is pure water. Water has the same concentration of hydrogen and hydroxide ions.
The antacid tablet has a pH of roughly 9.5 Since this is less than 14, but not equal to or less than 7, this must be an base. Therefore, it is considered to be in the basic range.
Answer:
9.5 is a base
Explanation:
A ph of less than 7 is an acid
7 is neutral
7 to 14 is a base
9.5 is a base
What would be the charge on an ion whose neutral atom has an electron configuration of 2.8.7?
O A. +7
OBO
C. +1
Answer:
–1
Explanation:
The electronic configuration of the neutral atom is given below:
2 8 7
From the electronic configuration of the neutral atom, we can see that the atom has 7 electrons in it's outermost shell. This implies that the element needs 1 more electron to complete it's octet configuration.
Therefore the charge on the ion of the element will be –1 indicating that the atom has received 1 electron to complete it's octet configuration.
Which is the formula mass of Na2S04?
Answer:
The formula mass of Na2S04 is 142.04 g/mol
Answer:
142.04 g/mol
Explanation:
the formula Na2SO4 means:two moles sodium (45.98g), one mile sulfur (32.06g), and four moles oxygen (64.00g) combine to form one mole of sodium surface (142.04g).
The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change
that must happen at the molecular level?
ОООО
The molecules move more quickly and their average kinetic energy increases.
The molecules move more slowly and their average kinetic energy decreases.
The molecules move more quickly and their average kinetic energy decreases.
The molecules move more slowly and their average kinetic energy increases.
Answer:
The molecules move more slowly and their average kinetic energy decreases
Explanation:
The increased temperature meant that the atoms in liquid had a greater average energy of motion so as the temperature decreases the reaction would be inverse.
The branch of science which deals with the chemicals bond is called chemistry.
The correct option is B.
The energy which is produced by the motion of the particles is called kinetic energy. Temperature increases the motion of the particles. So, the kinetic energy increases when the temperature rises.
According to the question, the temperature of the water decreases therefore the kinetic energy decreases.
Hence, the correct option is B that is the molecules move more slowly and their average kinetic energy decreases.
For more information, refer to the link:-
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Which of the following may suggest a catalyst has been used in a reaction, given the energy diagram for the same reaction without a catalyst?
distinguish between deliquescence and efflorescence.
Explanation:
Deliquescent substances are solids that absorb moisture from the atmosphere until they dissolve in the absorbed water and form solutions. Efflorescent: Efflorescent substances are solids that can undergo spontaneous loss of water from hydrated salts.
The formula for the compound ammonium chloride: NH4Cl+ NH4Cl NH3Cl NH4Cl2
Answer:
NH4Cl
Explanation:
i just did the test
Answer:
NH4Cl
Explanation:
Edg 2020
The structures found in a living cell can be compared to the parts of a factory that produces cars. Which part of the factory is most similar to the nucleus of a living cell? *
The computers that help control the machines in the factory
Which scenario would result in a decrease in population size, or a negative population growth? Use this formula: population growth = (birth rate + immigration) – (death rate + emigration) 0 individuals emigrate, 14 individuals die, 14 individuals are born, 14 individuals immigrate 40 individuals emigrate, 0 individuals die, 10 individuals are born, 28 individuals immigrate 12 individuals emigrate, 5 individuals die, 17 individuals are born, 0 individuals immigrate 19 individuals emigrate, 4 individuals die, 25 individuals are born, 0 individuals immigrate
Answer:
B) 40 individuals emigrate, 0 individuals die, 10 individuals are born, 28 individuals immigrate
Explanation:
its right on edg2020 :)
A sample of a certain barium chloride hydrate, BaCl2.nH2O, has a mass of 7.62 g. When this sample is heated in a crucible, it is converted to anhydrous barium chloride and water, with the water escaping as steam during the process. The mass of the solid anhydrous residue that remains in the crucible is 6.48 g. Determine the formula of this hydrate
Answer:
BaCl2.2H2O
Explanation:
Data obtained from the question include:
Mass of barium chloride hydrate (BaCl2.nH2O) = 7.62g
Mass of anhydrous barium chloride (BaCl2) = 6.48g
Next, we shall determine the mass of water in the barium chloride hydrate (BaCl2.nH2O). This can be obtained as follow:
Mass of water (H2O) = Mass of barium chloride hydrate (BaCl2.nH2O) – Mass of anhydrous barium chloride (BaCl2)
Mass of water (H2O) = 7.62 – 6.48
Mass of water (H2O) = 1.14g
Next, we shall write the balanced equation for the reaction. This is given below:
BaCl2.nH2O —> BaCl2 + nH2O
Next, we shall determine the masses of BaCl2.nH2O that decomposed and the mass H2O produced from the balanced equation.
Molar mass of BaCl2.nH2O = 137 + (35.5x2) + n[(2x1) + 16]
= 137 + 71 + n[2 + 16]
= (208 + 18n) g/mol
Mass of BaCl2.nH2O from the balanced equation = 1 x (208 + 18n) = (208 + 18n) g
Molar mass of H2O = (2x1) + 16 = 18 g/mol
Mass of H2O from the balanced equation = n x 18 = 18n g
Summary:
From the balanced equation above,
(208 + 18n) g of BaCl2.nH2O decomposed to produce 18n g of H2O.
Finally, we shall determine the formula for the hydrated compound as follow:
From the balanced equation above,
(208 + 18n) g of BaCl2.nH2O decomposed to produce 18n g of H2O.
But 7.62g of BaCl2.nH2O decomposed to produce 1.14g of H2O i.e
18n/(208 + 18n) = 1.14/7.62
Cross multiply
18n x 7.62 = 1.14(208 + 18n)
137.16n = 237.12 + 20.52n
Collect like terms
137.16n – 20.52n = 237.12
116.64n = 237.12
Divide both side by the coefficient of n i.e 116.64
n = 237.12/116.64
n = 2
Therefore the formula for the hydrate, BaCl2.nH2O is BaCl2.xH2O.
Potassium hydrogen tartrate is an acid used in making cookies such as snicker doodles. (In your home, it is called cream of tartar.) It can be titrated with a base such as KOH to determine purity. A sample of 0.500 g is titrated to a pink endpoint with 21.58 mL of 0.1125 M KOH. Determine the percentage of potassium hydrogen tartrate (KHC4H4O6) in the sample. The acid/base ratio is 1:1.
Answer:
91.4%
Explanation:
Potassium hydrogen tartrate, KHT, reacts with KOH as follows.
KHT + KOH → H₂O + K₂T
where 1 mole of acid (KHT) reacts per mole o base (KOH), -That is acid/base ratio 1:1
The endpoint of a titration is the point in which moles of KOH = moles of KHT, you can see this endpoint with an indicator or doing a potentiometric titration.
As the endpoint requires 21.58mL = 0.02158L of a 0.1125M KOH, moles of KOH = moles of KHT are:
0.02158L × (0.1125mol / L) = 2.428x10⁻³ moles of KOH = moles of KHT
To convert these moles to grams you use molar mass of KHT (188.177g/mol):
2.428x10⁻³ moles of KHT × (188.177g / mol) = 0.457g of KHT are in the sample.
As you add 0.500g of sample, percentage of KHT in the sample is:
(0.457g / 0.500g) × 100 =
91.4%-That is the purity of the sample-
Q2.
For the reaction given, how many litres of carbon dioxide gas will be formed by the reaction of 400
litres of oxygen with sufficient pentene (CH..)? The reaction takes place at 125°C and 10.5 atm.
2 C5H10(1) + 15 O2(g) →10 CO2(g) + 10 H20 (8)
Answer:
266 liters Carbon iv oxide will be formed
Explanation:
The first thing we need to do here is to calculate the number of moles of oxygen reacted.
This can be calculated using the ideal gas equation;
Mathematically;
PV = nRT
From the question;
P = pressure = 10.5 atm
V = volume = 400 liters
n = number of moles = ?
T = temperature = 125 + 273 = 398K
R = molar gas constant = 0.0821 L•atm•K^-1•mol^-1
Substituting these values, we have ;
n = PV/RT
n = (10.25 * 400)/(398 * 0.0821) = 125 moles
From the question;
15 moles oxygen gave 10 moles CO2
125 moles oxygen will give x moles CO2
x = (125 * 10)/15 = 83 moles
Now, we want to know the volume of CO2, present in 83 moles using the given reaction conditions.
Mathematically;
PV = nRT
V = nRT/P
= (83 * 0.0821 * 398)/10.25 = 265.65 which is approximately 266 Liters