Mass percent of a compound=(mass of element in molecule/total mass of compound)×100 (a) 63.64%
What is mass percentage composition ?We use the concept of mass percentage composition to explain the concentration of an element in a compound or a component in a combination. This word refers to the overall percent by mass of each element present in a compound.
In chemistry, a compound's percent composition is calculated by dividing its total amount of each elements by the compound's total amount, multiplied by 100. The following formula determines an element's percentage composition:
(gE/gT) = %CE 100
Here, %CE stands for the element's composition in percent.
How to calculate the percentage of each element by mass makes up each compound?
To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.
Calculating total mass of HNO3
= 1 x 1 + 14 x 1 + 16 x 3
= 1 + 14 + 48
= 63
Calculating the mass percentage of Nitrogen in HNO3
= 1/63 x 100
= 1.586 %
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Researchers are attempting to create a new battery based on the following chemistry and would like the battery to produce 1.0-1.2 volts. Given the standard cell potential of the reaction, they propose to connect 3 identical cells inside the single new battery. Calculate the voltage of this (3-cell) battery at 25 C when 1.3 M Fe and 0.010 M Fe in pH 3.1 buffer react with O at 0.20 atm. (For full credit your answer must be correct to /-0.02.)
Answer:
Hello your question has some missing data attached below is the missing data ( Note: the PH in the attached question is 3.2 but the PH value I used in the solution = 3.1 as requested in the initial question )
answer : 0.41 volts
Explanation:
Given data :
[ Fe²⁺ ] = 1.3 M
[ Fe³⁺ ] = 0.010 M
[ H⁺ ] = 10^3.1
O2 = 0.20 atm
E⁰cell = 0.46 volts
temperature = 25°C ( room temperature )
Calculate the voltage of this ( 3 -cell battery )
we can apply the relation below
E = E⁰cell - ( 0.0591 / n )*Log Q
= 0.46 - ( 0.0591 / 4 )*Log [ (0.01)^4 / (1.3)^4 * (10^3.1)^4 * 0.2 ]
= 0.4120 Volts
Note : Q is determined from the equation attached to the question
The largest use of oil is for:
air conditioning
gasoline
heat
lubricants
Answer:
Lubricants
Explanation:
oil is slick, allowing it to aid in the movement of machinery
No FILES PLZZ
What can all non-renewable resources theoretically be?
A
converted to nonmetallic minerals
B
converted to renewable ones
exhausted or depleted
D
recycled or reused
Answer:
B.
Converted to renewable ones
exhausted or depleted
What information does an equilibrium constant give about a reaction?
O A. It tells how long it takes the reaction to reach equilibrium.
B. It tells whether products or reactants are favored at equilibrium.
C. It tells how much energy is required for the reaction to happen.
O D. It tells what the rate constant of the reaction is at equilibrium.
Answer:
B. It tells whether products or reactants are favored at equilibrium.
Given: Mg3N2 + 3 K2O → 3 MgO + 2 K3N
How many moles of magnesium nitride, Mg3N2 is needed to react to produce 11.6 grams of MgO? Show work
Answer:
0.11
Explanation:
This equation is not balanced because there is an unequal amount of O's on both sides of the equation. The left hand side has 4 P's and the right hand side has 4 P's. So the P atoms are balanced. The left hand side has 2 O's and the right hand side has 10 O's.
To fix this unbalanced equation a 5 in front of the O2 on the left hand side is added to make 10 O's on both sides resulting in
P4 + 5O2 = 2P2O5
The equation is now balanced because there is an equal amount of substances on the left and the right hand side of the equation.
how many moles of hydrogen fluoride to make 16 moles of hydrogen
Answer: You can view more details on each measurement unit:
Explanation:
molecular weight of Hydrogen Fluoride or mol The molecular formula for Hydrogen Fluoride is HF. The SI base unit for amount of substance is the mole. 1 grams Hydrogen Fluoride is equal to 0.049984147027929 mole.
State Faraday's 2nd law of electrolysis
Answer:
[tex]{\huge\red{\fbox{{Faraday's 2nd Law of Electrolysis :-}}}}[/tex]
According to the second law of electrolysis, the same quantity of electricity will produce or dissolve chemically equivalent amounts of all the substances. This quantity of electricity is called Faraday (F). One Faraday is equal to 96487 coulombs per mole of electronic charges.
Hydrogen gas is produced when we
metal with hydrochloric acid:
react magnesium
Mg(s) + 2 HCI(aq) - MgCl(aq) + H2(g) 7z
(a) If 4.50 g of hydrogen gas is collected at STP, what
volume of hydrogen does
this represent?
(b) If 0.52 mol of magnesium completely reacted, what
amount of hydrogen gas (in moles) would be produced
at STP? How many grams of hydrogen iS this?
Magnesium is a metal that reacts quickly. The reaction with hydrochloric acid will result in the production of magnesium chloride and hydrogen gas.
How much hydrogen is generated by the reaction at STP?Molecules, pressure, and temperature were necessary to determine the gas's volume. We only need to determine the moles of hydrogen because temperature and pressure have already been provided. As a result, 16.8 L of hydrogen were created at STP by dissolving 13.5 g of aluminum in sulfuric acid.
How much hydrochloric acid must be present for 0.50 mol of magnesium to react?The chemistry is described below. According to the aforementioned reaction, 1 mole of magnesium and 2 moles of HCl are involved. The HCl moles are therefore 20.50mol=1mol 2 0.50 m o.
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Need help on this one
Answer:
Explanation:convection
A classroom has one triple-beam balance. To complete an experiment, each student must use the balance for 6 minutes. The class meets for 1 hour. How many students can participate in the experiment?
As the class is of 1 hour and and each student uses for 6 minutes so in 1 hour 10 students will use the balance.
What is a balance?
A scale or balance is a device used to measure weight or mass. These are also known as mass scales, weight scales, mass balances, and weight balances.
The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. One plate holds an object of unknown mass (or weight), while known masses are added to the other plate until static equilibrium is achieved and the plates level off, which happens when the masses on the two plates are equal.
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I need help with how to do question c, d, and e
The answer of the following question of concentration are:
c) The law expression for this reaction is k[A].
d) The value of k including its units is on the specific reaction.
e) The half-life of the reaction is T1/2 = 0.693/k.
What is concentration?
Concentration in chemistry is a measure of the amount of a substance that is present in a given volume. It is usually expressed in terms of mass, moles, or volume.
c) The law expression for this reaction is rate = k[A], where k is the rate constant. This is because in a first-order reaction, the rate of reaction is proportional to the concentration of the reactant.
d) The value of k depends on the specific reaction, and can be determined by measuring the reaction rate at different concentrations of A and plotting a graph of rate versus concentration of A.
e) The half-life of a first-order reaction is given by T1/2 = 0.693/k, where T1/2 is the half-life and k is the rate constant. The units of the half-life are seconds.
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Which statement best describes general equilibrium? Equilibrium is reached when the reaction stops. There is only one set of equilibrium concentrations that equals the Kc value. At equilibrium, the rate of the forward reaction is the same as the rate of the reverse reaction. At equilibrium, the total concentration of products equals the total concentration of reactants.
Answer: The statement 'At equilibrium, the rate of the forward reaction is the same as the rate of the reverse reaction' best describes general equilibrium.
Explanation:
A chemical process in which the rate of forward reaction is equal to the rate of backward reaction.
For example, [tex]A + B \rightleftharpoons C + D[/tex]
This reaction is an equilibrium process. Symbol which represents the equilibrium is '[tex]\rightleftharpoons[/tex]'.
Thus, we can conclude that the statement 'At equilibrium, the rate of the forward reaction is the same as the rate of the reverse reaction' best describes general equilibrium.
How many moles are in 4.25 g of C12H22011?
pls help ASAP!
Answer:
molecular weight of C12H22O11 or grams This compound is also known as Lactose or Sucrose or Maltose. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles C12H22O11, or 342.29648 grams.
Explanation:
what amount of oxygen gas in moles contains 1.8x10^22 molecules?
Answer:
0.03 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.8 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.02990...[/tex]
We have the final answer as
0.03 molesHope this helps you
What is bungee gum made of? A) The properties of both rubber and gum. B) Bungee cord and gum.
Answer:
The proporties of both rubber and gum.
Explanation:
Scientists found the remains of dinosaur fossils in a remote section in the west, located
within ten miles of a meteor crash site. Which statement can be made about the
dinosaur and the meteor?
O a. The dinosaur could have died from a flood.
O b. The dinosaur and the meteor are not related.
O c. The dinosaur could have died from freezing to death.
O d. The dinosaur could have died due to an meteor crash.
Answer:
D The dinosaur could have died due to an meteor crash.
Explanation:
Answer:
D
Explanation:
The dinosaurs fossils were found ten miles away from the meteor crash site. Correct me if I'm wrong
A barrel of crude oil has a volume of 42 gallons, only approximately 45% of which is processed into gasoline. If your car achieves 37 mi/gal, and you drive 36,000 miles in one year, how many barrels of crude oil are required to run your car for a year?
What does a group of atoms joined by chemical bonds create?
•A molecule
O A compound
O A fission reaction
O A fusion reaction
Answer:
I can say that it is not a compound because I got it wrong
Explanation:
Answer:
MoleculeExplanation:
I took the test
True or False: Salt will freeze with water molecules.
Answer:
True
Explanation:
Salt is used to keep ice from forming but it only helps with certain tempuratures is still able to freeze
Answer:
yes it is true have a great time
The diagram at right shows a manometer connected to a flask. The mercury levels are measured in mm. the pressure in the room is 740mmHg. Determine the pressure of the gas in the flask.
on the flask it has 505mm and 465mm
pressure=585...
this is your answer
Standard temperature and
pressure (STP) is 273 Kand
[?] atm.
Answer:
Explanation:
273K
1ATM
Answer:
273 K 1 atm
Explanation:
Standard temperature and pressure (STP) is [273] K and [1] atm
50mL of potassium hydroxide (KOH) solution contains 7 grams of potassium hydroxide.
What is the molarity (mol/L) of the potassium hydroxide solution?
Given the atomic masses:
K= 39,0 = 16 and H= 1
Answer:
2.5 mol/L
Explanation:
We'll begin by calculating the number of mole in 7 g of KOH. This can be obtained as follow:
Mass of KOH = 7 g
Molar mass of KOH = 39 + 16 + 1
= 56 g/mol
Mole of KOH =?
Mole = mass /molar mass
Mole of KOH = 7 / 56
Mole of KOH = 0.125 mole
Next, we shall convert 50 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
50 mL = 50 mL × 1 L / 1000 mL
50 mL = 0.05 L
Finally, we shall determine the molarity of the KOH solution. This can be obtained as follow:
Mole of KOH = 0.125 mole
Volume = 0.05 L
Molarity of KOH =?
Molarity = mole / Volume
Molarity of KOH = 0.125 / 0.05
Molarity of KOH = 2.5 mol/L
Thus, the molarity of the KOH solution is 2.5 mol/L
What would indicate that a physical change takes place when cooper is drawn into wire
Answer:
When a copper is drawn into wire the only change that occurs is change in its shape and size no change will take place into its composition that is the wires are still possessing the properties of copper metal. Thus, a physical change takes place when copper is drawn into wire.
What is the number of moles in 0.025 g (NH4)2Cr2O7?
A) 1.5 x 1022
B) 4.2 x 10-26
C) 6.3
D) 1.0 x 10-4
E) 1.0 x 104
Answer: D
Explanation:
d
The number of moles in 0.025 g of (NH[tex]_4[/tex])[tex]_2[/tex]Cr[tex]_2[/tex]O[tex]_7[/tex] is 1.0 x 10⁻⁴moles. The word "mole" is shortened to "mol".
What is mole?A mole is just a measuring scale. In reality, it's one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The mole is indeed a SI unit that is used to quantify any quantity of a material. The word "mole" is shortened to "mol". Exact number of particles in one mole is 6.0221407610 23.
The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear. To fill this gap between extremely small and extremely huge numbers, scientists created the mole.
number of mole of (NH[tex]_4[/tex])[tex]_2[/tex]Cr[tex]_2[/tex]O[tex]_7[/tex] = given mass / molar mass
= 0.025 / 252.07
=9.91 × 10⁻⁵moles
= 1.0 x 10⁻⁴moles
Therefore, the correct option is option D
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Under the right conditions aluminum will react with chlorine to produce aluminium chloride.
2 Al +3 Cl2 - 2 AlCl3
How many grams of aluminum chloride can be produced when 157.0g of aluminum react with excess chlorine?
CORRECT ANSWER IS 775.9 g AICI3 but what are the steps to get that answer ?
Answer:
Ok
The Limiting reagent is Aluminum. Its not in excess. So the reaction ends once its exhausted. So all Aluminum will be used up
From the question ....
157g of Al
Find the number if reacting Moles...
M=mass/molar mass
M= 157/27
=5.81moles of Aluminum is reacting.
Now looking at the equation of reaction(Always make sure its balanced)...
2moles of Al react to produce 2 Moles of AlCl3
Their Mole ratio is equal
Since their Mole ratio is equal 2:2.... That means... That 5.81moles of AlCl3 would be produced because the mole of Al is 5.81
So We now know the Moles of AlCL3 produced
getting the Mass won't be difficult.
Again
Mole=Mass/Mm
Mass = Mole x Mm(Molar Mass)
Mass of AlCl3 = 5.81 x (27 + 35.5x3)
Note: The arithmetic done in the parenthesis is the molar mass of AlCl3
Mass of AlCl3 = 5.81 x 133.5
=775.63g of AlCl3.
Have a great Day!!!!
A transverse wave is shown here. Several wave properties are labeled with letters. Which of these statements accurately reflects the energy associated with the wave? Select ALL that apply. Responses A Y is the frequency, and an increase in Y is associated with an increase in energy.Y is the frequency, and an increase in Y is associated with an increase in energy. B W is the amplitude, and a decrease in W is associated with an increase in energy.W is the amplitude, and a decrease in W is associated with an increase in energy. C W is the amplitude, and an increase in W is associated with an increase in energy.W is the amplitude, and an increase in W is associated with an increase in energy. D Z is the displacement, and a decrease in Z is associated with an increase in energy.Z is the displacement, and a decrease in Z is associated with an increase in energy. E X is wavelength, and a decrease in X is associated with an increase in energy.
Answer:
C) W is the amplitude, and an increase in W is associated with an increase in energy.
E) X is wavelength, and a decrease in X is associated with an increase in energy.
Explanation:
A transverse wave consists of an oscillating electric field that is perpendicular to the direction of the wave. Increasing either the amplitude or the wavelength of the wave increases its energy. For a transverse wave, the amplitude corresponds to W, while the wavelength is labeled X. So increasing W or decreasing X will create increase the energy of the wave.
8. Jill conducted an experiment to investigate which plant food would make her
plants grow faster. She tried four different plant foods on plants of the same
type and age. Jill concluded that the plant that was fed Brand A grew the
fastest. Jill did not realize that the plant that was fed Brand A also received
more sunlight. (SC.7.N.1.5.3)
What error did Jill make in her experiment?
a) She used the wrong kind of plant.
b) She used too much plant food.
c) She did not control the variables.
3. Which body system protects the inside of our body and regulates our body temperature?
Answer:
integumentary system
Explanation:
The integumentary system reduces water loss, contains receptors that respond to touch, regulates body temperature, and protects the inside of the body from damage. Receptors in skin send sensory information to the brain.
Answer:
Integumentary system
Explanation:
The integumentary system is the largest organ of the body, equaling 15-20% of our total body mass. It acts as a barrier to physical, chemical, and biological agents. The skin prevents water loss and regulates body temperature
Q13 Which compound has a boiling point that is influenced by hydrogen bonding?
A CH3CHO
B CH3OCH3
C HCO2H
D HCO2CH3
Answer:
[tex]A. \: \: CH _{3}CHO[/tex]
ethanal
This is because hydrogen is bonded with oxygen atom which is highly electronegative.
Answer ASAP Pls don't use links
Questions:
Answer the following on your answer sheet.
1. What will happen if you use a triangle with a steeper inclination?
2. What will happen if the triangle has a less steep inclination?
3. How will the new and old screws be compared?
Answer:
3 The Shank and the Threads