Answer:
[tex]Fe_6O_9[/tex]
Explanation:
Hello there!
In this case, since these problems about formulas, firstly require the determination of the empirical formula, assuming that the given percentages are masses, we can calculate the moles and mole ratio of oxygen to iron as shown below:
[tex]n_{Fe}=70/55.85=1.25\\\\n_O=30/16=1.875[/tex]
In such a way, by rounding to the first whole number we multiply by 8 and divide by 5 to obtain:
[tex]Fe_{2}O_{3}[/tex]
Whose molar mass is 159.69 g/mol and the mole ratio of the molecular to the empirical formula is:
479.1/159.69=3
Therefore, the molecular formulais:
[tex]Fe_6O_9[/tex]
Regards!
Fill out the following regarding the element
Atomic Number
Atomic Mass
Number of Protons
Number of Electrons
Number of Neutrons
Answer:
1 is 84
2 is 218
3 is 84
4 is 84
5 is 134
1.34 x 10^24 molecules of CH4 is how many moles
Answer:
3.4e+25
Explanation:
One mole of methane or CH₄ contains 6.02 × 10²³ molecules. Then, number of moles of methane containing 1.34 × 10²⁴ molecules is 2.25.
What is Avogadro number ?One mole of a substance is its amount containing 6.02 × 10²³ atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.
Similarly one mole of every compound contains 6.02 × 10²³ molecules. The mass of one mole of compound is called its molar mass. The number of moles of the compound can be determined by dividing the given mass by molar mass.
Methane is a covalent compound formed from carbon and hydrogen atoms. One mole of methane contains 6.02 × 10²³ molecules of CH₄ . Hence number of moles of of 1.34 × 10²⁴ molecules of methane is:
1.34 × 10²⁴/6.02 × 10²³ = 2.25 .
Hence, the number of moles of CH₄ that contains 1.34 × 10²⁴ molecules is 2.25 moles.
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which of the following halides reacts more slowly in an SN1 reaction: 5-chloro-1,3-cyclopentadiene or 7-chloro-1,3,5-cycloheptatriene Group of answer choices 5-chloro-1,3-cyclopentadiene neither of these will react in an SN1 reaction 7-chloro-1,3,5-cycloheptatriene they will both react at the same rate
Answer:
5-chloro-1,3-cyclopentadiene
Explanation:
5-chloro-1,3-cyclopentadiene will react more slowly in an SN1 reaction. ( i.e. No reaction as the product is unstable ) attached is the representation of the rate of reaction of both Halides which shows that 5-chloro-1,3-cyclopentadiene reacts the slowest .
Also During SN1 reaction Carbocation is formed .
Attached below is the solution explanation
When 6.13 g of a certain molecular compound X are dissolved in 90. g of formamide (NH2COH), the freezing point of the solution is measured to be 2.1 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits.
Answer:
321.6 g/Mol
Explanation:
mass of solvent in kilograms = 90g/1000 = 0.09 Kg
Given that;
ΔTf = Kf . m . i
Where;
Kf = freezing point constant = 4.25 °C/Kg mol
m = molality of the solution
i = Van't Hoff factor = 1 (since the substance is molecular)
ΔTf = freezing point of pure solvent - freezing point of solution
freezing point of pure solvent = 3 °C
ΔTf = 3 °C - 2.1 °C
ΔTf = 0.9 °C
0.9= 4.25 * 6.13/M/0.09 * 1
0.9= 26.0525/M * 1/0.09
0.9 = 26.0525/0.09 M
0.9 * 0.09M = 26.0525
M = 26.0525/0.9 * 0.09
M= 321.6 g/Mol
What quality is attributed to water due to “capillary action”?
A. change of liquid water into gaseous phase
B. the ability of water molecules to adhere to the surfaces of objects
C. high volatility
D. vapor pressure
Answer:
I think it's B. The ability of water molecules to adhere to the surfaces of objects
& Write five examples of liquid to liquid mixture.
Answer:
huikl
daffafafafafa
Friction. That was the topic Sally and Sue are investigating in science. They used a small car and a ramp as seen in the
picture above. They knew that they slipped easily on waxed floors but not on carpet, so they decided change the
material on the surface of the ramp. They planned to use glass, carpet, aluminum foil, and sandpaper and run the car
down the ramp over each surface. The girls wrote a research question: Do rougher surfaces tend to create more
friction than smoother surfaces? They predicted that the greater the friction, the slower the car would travel down the
ramp
What would be the BEST hypothesis for their experiment?
A)
The smoother the ramp surface, the greater the car's speed.
B)
Heavier cars travel down the ramp faster than lighter cars.
The greater the angle of the ramp, the faster the car will move.
D)
Without lubrication, the car will travel slowest down the sandpaper
covered ramp.
Answer: A: The smoother the ramp surface, the greater the car's speed.
Explanation: I did the USA test prep
What is one movement that liquid water CANNOT do while on or at the Earth's surface? (GIVE RIGHT ANSWER OR I DELETE 100 POINTS)
Answer:
One movement that i can't do is float in mid air
Explanation:
1. For each of the following formulas:
1) if ionic, write the formulas of the ions; if covalent, draw the Lewis structure
2) For each covalent compound, describe the electronic and molecular geometry
3) For each covalent compound, describe the hybridization of the central atom
4) Name each compound, except the organic one.
5) How many sigma and how many pi bonds does each compound have?
MnSO4 CH3NH2 PCl5 O2 LiF
Answer:
See Explanation
Explanation:
The ionic compounds are; MnSO4 and LiF
The covalent compounds are; CH3NH2, PCl5 and O2
1) The formulas of the ions are;
MnSO4 - Mn^2+ SO4^2-
LiF - Li^+ F^-
The structure of each of the three covalent molecules is shown in the images attached to this answer.
2) CH3NH2 - Has a tetrahedral molecular geometry and electronic geometry
PCl5 - Has a trigonal bipyramidal molecular geometry and electronic geometry
O2 - Has a linear molecular geometry and electronic geometry.
3) CH3NH2 is sp3 hybridized
PCl5 is sp3d hybridized
O2 - is sp2 hybridized
4) MnSO4 - Manganese II sulphate
PCl5 - Phosphorus pentachloride
O2 - Oxygen molecule
LiF- Lithium fluoride
5) PCl5 - Five sigma bonds and no pi bond
CH3NH2 - 6 sigma bonds and no pi bond
O2 - 1 sigma bond and 1 pi bond
How many moles of lithium hydroxide are required to react with 19.2 mol CO2, the average amount exhaled by a person each day?
Answer:
38.4 mol LiOH
Explanation:
Step 1: Write the balanced neutralization equation
2 LiOH + CO₂ ⇒ Li₂CO₃ + H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of LiOH to CO₂ is 2:1.
Step 3: Calculate how many moles of lithium hydroxide are required to react with 19.2 mol CO₂
19.2 mol CO₂ × 2 mol LiOH / 1 mol CO₂ = 38.4 mol LiOH
Changing from solid to a liquid at or above melting point
is
Answer:
liquefaction
liquefaction is a process when a something turns into a liquid.
Explanation:
What does pressure measure
Answer:
Pressure measurement is the analysis of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area.
hope this helps! mark as brainlist! :D
Answer:
THIS IS YOUR ANSWER I HOPE IT IS HELPFUL PLZ MARKS ME BRANILYHow many moles are there in 2.30 grams of NH4SO2?
Answer:
There are 0.028 moles in 2.30 grams of NH₄SO₂.Explanation:
To Calculate:
How many moles are there in 2.30 grams of NH₄SO₂?We know that:
Mole = Given mass/Molar massWe have:
Given mass = 2.30 gMolar mass of NH₄SO₂ = 82Finding the number of mole:
⟶ Mole = 2.30/82
⟶ Mole = 0.028 (approx.)
Hence,
There are 0.028 moles in 2.30 grams of NH₄SO₂.How many ions will CaBr2 dissociate to in solution?
-cannot be determined
-3
-2
-0
Answer:
3.
Explanation:
Hello there!
In this case, according to the definition of ionic bonds, whereby the cations give away their initial valence electrons to the anions, we infer that ionic species calcium bromide has three ions, one calcium ion and two bromide ions, and therefore the answer is 3.
Regards!
Pick the second most abundant component of dry air.
A. Molecular nitrogen
B. Molecular oxygen
C.argon
D. Carbon dioxide
E. Water
F. Ozone
Answer:
ozone
Explanation:
the ozone layer is the thickest air on the earth's atmosphere protecting us from ultra violent rays from the sun
20 points to the person who answers!! go fast
Answer:
nutrients
Explanation: if not nurtiants then vegetation, but probably nutrients
A sample of a hydrocarbon is found to contain 7.48g carbon and 2.52g hydrogen. What is the empirical
formula for this compound?
Answer:
CH₄
Explanation:
To determine the empirical formula of the hydrocarbon, we need to follow a series of steps.
Step 1: Determine the mass of the compound
The mass of the compound is equal to the sum of the masses of the elements that form it.
m(CxHy) = mC + mH = 7.48 g + 2.52 g = 10.00 g
Step 2: Calculate the percent by mass of each element
%C = mC / mCxHy × 100% = 7.48 g / 10.00 g × 100% = 74.8%
%H = mH / mCxHy × 100% = 2.52 g / 10.00 g × 100% = 25.2%
Step 3: Divide each percentage by the atomic mass of the element
C: 74.8/12.01 = 6.23
H: 25.2/1.01 = 24.95
Step 4: Divide both numbers by the smallest one, i.e. 6.23
C: 6.23/6.23 = 1
H: 24.95/6.23 ≈ 4
The empirical formula of the hydrocarbon is CH₄.
A saturated solution of sucrose in 500.0 mL of boiling water is cooled to 20.0 0C. What mass of rock candy will be formed?
Answer:
1280.5g
Explanation:
What cell structure is best represented by the image?
A.
a non-permeable cell wall
B.
a selectively permeable membrane
C.
a waterproof nuclear envelope
D.
a permeable exoskeleton
Answer:where is the image
Explanation:
Answer:
B.
a selectively permeable membrane
Explanation:
Question 5 (5 points)
Complete the following sentences:
a)
is the least reactive alkall metal.
b)
is the most reactive alkali metal.
is the least reactive alkaline earth metal.
d)
is the most reactive alkaline earth metal.
e)
is the most reactive halogen
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Blank 2:
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Blank 5:
Question 6.12
Which of the following statements regarding the energy of a particle is NOT correct?
a. The ground state of a particle is the lowest and most stable energy state.
b. The energy of a particle is zero when it is in its ground state.
c. An excited state is any energy state above the ground state.
d. When the particle undergoes a transition from a higher energy state to a lower
one, energy is emitted
A student pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. She then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. The student performs the experiment one more time but this time she stirs the mixture rapidly.
Answer:
It will go faster each time because she is stirring therefore the water can get to the salt faster than it just sitting at the top
Explanation:
Question 6 (4 points)
(08.02 MC)
What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water? (4 points)
а
26.596
D
20.946
с
18.296
d
16.796
Answer:
20.9%
Explanation:
I took the test i hope this helps:)
The percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%. This is calculated using the definition (formula) of percentage by mass of a solution.
What is meant by percentage by mass?The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.
The formula for percentage by mass is given as
percentage by mass = (mass of the solute/ total mass of the compound solution) × 100
Calculating percentage by mass for the given solution:The mass of the solute ( the chemical which is going to be dissolved) HCl
= 27.0 grams
The mass of the solvent (the substance in which a solute dissolve) water
= 102.0 grams
So, the total mass of the solution = 27.0 + 102.0 = 129.0 grams
Then, the percentage by mass = [tex]\frac{27.0}{129.0}[/tex] × 100 = 20.93%
Which is approximate equal to 20.946 at option B.
Therefore, the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%.
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MOLE CONVERSIONS
1. How many H2O molecules are in 183.2 grams of H2O gas?
2. How much space (L) does 3.614 x 1026 molecules of H2O2 take up?
3. How many molecules are in 3492.5 grams of Mg3(PO4)2?
4. How many grams does 60.2 L of Al(NO3)3 weigh?
5. How many Nmolecules are in 473.2 grams of N ?
6. How many grams does 80.34 L of Hz weigh?
7. How many grams are in 5.39 x 1025 molecules of
Al(OH),?
Stoichiometry and Balancing Chemical Equations
Balance the following chemical reactions
8. _H2 + _N2 => _NH3
9. _58 + _O2 => _SO
10. _Ni(CIO)2 → _NICI + O2
11 _C₂H4
_02 > CO2
H2O
12 _KCIO
_КСІ
0
13 Cu(OH)2 + __HC H302
Cu(C2H2O2)2
14. CH8 + __0
CO ____H20
+
+
+
_H20
15. 76.2 Liters of O2 gas reacts with an excess of Cat STP. How many grams of
CO will be produced?
2C + O2 -> 200
Due in less than 5 minutes
Answer:
1. 6.116x1024 Molecules of H2O
2. 13400 L
3. 8.001x1024 Molecules of Mg3(PO4)2
4. 572 g.
5. 1.017x1025 Molecules of N2
6. 7.24 g
.7. 6980 g. of Al(OH)3
8. 3H2 + N2 => 2NH3
9. S8 + 8O2 => 8SO2
10. Ni(ClO3)2→ NiCl2 + 3O2
11. C2H4 + 3O2→ 2CO2 + 2H2O
12. 2KClO3→ 2KCl + 3O2
13. Cu(OH)2 + 2HC2H3O2→ Cu(C2H3O2)2 + 2H2O
14. C3H8 + 5O2→ 3CO2 + 4H2O
15. 191 g of CO
How many Moles are there in 8.55 x 10^24 molecules of NaCl?
Answer:
Moles = avogadro's constant divided by the number of molecules.
How much potassium chloride is needed to make 0.500 m solution with 1.50 L of water?
Answer:
55.9 g KCl.
Explanation:
Hello there!
In this case, according to the definition of molality for the 0.500-molar solution, we need to divide the moles of solute (potassium chloride) over the kilograms of solvent as shown below:
[tex]m=\frac{mol}{kilograms}[/tex]
Thus, solving for the moles of solute, we obtain:
[tex]mol=m*kilograms[/tex]
Since the density of water is 1 kg/L, we obtain the following moles:
[tex]mol=0.500mol/kg*1.50kg\\\\mol=0.75mol[/tex]
Next, since the molar mass of KCl is 74.5513 g/mol, the mass would be:
[tex]0.75mol*\frac{74.5513g}{1mol}\\\\55.9g \ KCl[/tex]
Regards!
The enthalpy of formation of water is -285.8 kJ/mol. What can be inferred from this statement? O The enthalpy of the products is equal to the enthalpy of the reactants. O Heat is absorbed during the process. O Heat is released during the process. The enthalpy of the products is more than the enthalpy of the reactants.
Answer:
the answer is c
Explanation:
i did the test
The enthalpy of the formation of water is -285.8 kJ/mol. The information that can be made by the statement is heat is released during the process. The correct option is C.
What is enthalpy?Enthalpy is the volume times the pressure times the internal energy of the system. It is an entity of thermodynamics. It is the measurement of the energy in a thermodynamic system. The enthalpy totals the internal energy plus pressure and volume.
The statement that is given here is given that enthalpy is -285.8 kJ/mol. The value is negative, so the energy is released here. When energy is gained the energy will be positive and when the energy is released it is negative.
Thus, the correct option is C, heat is released during the process regarding the given statement of enthalpy.
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-4. A student learns that all of the particles within an object possess kinetic energy. Based on this fact,
the student can conclude that all of the particles in the object-
A. Contains the same atoms. B. Are hotter than their surroundings C.Are in motion. D. Are covalently bonded
Answer:
C
Explanation:
The correct option is option C. which is "are in motion".
All the particles inside an object have kinetic energy, which implies that the particles are moving. Kinetic energy is the force that drives an object's or its constituent parts in motion. As a result, it can be inferred from this fact that the object's particles are in motion.
Options A, B, and D are not necessarily true based on the given information. The fact that particles have kinetic energy does not imply that they contain the same atoms (option A), are hotter than their surroundings (option B), or are covalently bonded (option D). These characteristics are not directly related to the presence of kinetic energy in particles.
Therefore, option c is the correct option.
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9. Calcule el % en masa para cada 28.2 g de Na2SO4 en 247 g de solución
Answer:
%Mass =Mass of Solute/Mass of solution x100
= 28.2/247 x 100
=11.42%
The table below shows the average summer temperature increases for regions in Canada. Which of the following conclusions is supported by the data?
Answer:
The mountain regions are warming more than the coast
Explanation:
The average rise in temperature was the greatest in the mountains, and the coast average was less than the mountain average.
