The molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
How to calculate molecular formula?The molecular formula can be calculated from the empirical formula. The empirical formula of the compound is calculated as follows:
C = 38.7% = 38.7gH = 9.76% = 9.76gO = 51.5% = 51.5gNext, we convert the mass to moles by dividing by their atomic mass:
C = 38.7 ÷ 12 = 3.23molH = 9.76 ÷ 1 = 9.76molO = 51.5÷ 16 = 3.22molNext, we divide by the smallest (3.22)
C = 1H = 3O = 1Hence, the empirical formula of the compound is CH3O
If the molar mass of the compound is 62g/mol;
(CH3O)n = 62
31n = 62
n = 2
(CH3O)2 = C2H6O2
Therefore, the molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
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If you dispense 40 ml of hexane, but it turns out you only need 5 ml, what should you do with the remainder?
After subtracting the volume needed from the volume dispensed, we got a remainder of 35ml
Subtraction of NumbersGiven Data
Volume of Hexane dispensed = 40mlVolume needed = 5 mlLet us compute the amount of excess hexane/ the volume that will remain
Remainder = The difference in volume dispensed and the volume needed
Remainder = 40-5
Remainder = 35 ml
The remainder is 35ml
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If you dispense 40 ml of hexane, but it turns out you only need 5 ml, then we should have 35 mL of remained hexane.
How would we calculate the remaining volume?Remaining volume of any liquid will be calucted as:
Remaining Volume = Total volume - Used volume
Given that, total volume of hexane = 40 mL
Used volume of hexane = 5 mL
On putting values in above equation, we get
Remaining volume = 40 - 5 = 35 mL
Hence required value of remaining volume is 3 mL.
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Calcium acetate reacts with sodium carbonate to produce calcium carbonate and sodium acetate
Answer:
(CH₃COO)₂Ca(aq) + Na₂CO₃(aq) = 2CH₃COONa(aq) + CaCO₃(s)
2CH₃COO⁻ + Ca²⁺ + 2Na⁺ + CO₃²⁻ = 2CH₃COO⁻ + 2Na⁺ + CaCO₃
Ca²⁺ + CO₃²⁻ = CaCO₃
How many more atoms are there in 48g of C compared with 48.6g of Mg? Explain your answer.
Answer:
The number of carbon atoms is twice the number of magnesium atoms
How much energy, in kJ, is released when 27.0 grams of water is cooled from 112C to -15C?
Answer: Q
=
−
53
,
796.6
J
Explanation is right here instead
The equation for heat is
Q
=
m
(
t
f
−
t
i
)
C
p
Q = heat in Joules
m = mass in grams
t
f
= final temp
t
i
= initial temp
C
p
= Specific Heat Capacity
For this problem
Q
=
?
?
?
m
=
275
g
t
f
=
38.4
o
C
t
i
=
85.2
o
C
C
p
=
4.18
j
g
o
C
Q
=
275
g
(
38.4
o
C
−
85.2
o
C
)
4.18
J
g
o
C
Q
=
275
g
(
−
46.8
o
C
)
)
4.18
J
g
o
C
Q
=
−
53
,
796.6
J
The negative Joule value means heat is being lost in an exothermic reaction.
Explanation:
Describe the process used to balance an equation?
Answer:
Explanation:
When you balance a chemical equation, you change coefficients. You never change subscripts. A coefficient is a whole number multiplier. To balance a chemical equation, you add these whole number multipliers (coefficients) to make sure that there are the same number of atoms on each side of the arrow
What is s° for b in the reaction 3 a → 2 b if ∆s°(rxn) =-277. 1 j/mol ･ k? [s° (a) = (205. 0 j/mol ･k)]
Entropy is the degree of disorder of a system. The entropy of b is 168.95 j/mol ･k.
What is entropy?The term entropy refers to the degree of disorder in a system. We have to know that the change in entropy of a system is the entropy of the product minus the entropy of the reactants.
Hence;
-277. 1 = [2(b) - 3(205. 0)
-277. 1 = 2b - 615
b= -277. 1 + 615/2
= 168.95 j/mol ･k
The entropy of b is 168.95 j/mol ･k.
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Is mixing baking soda and vegetable oil a chemical change or physical change and WHY? PLEASE HELP
Answer:
chemical change i think
Explanation:
As the drops of vinegar fall through the oil to the bottom of the bottle, it reacts with the baking soda to make carbon dioxide gas. These bubbles attach themselves to the colored vinegar and cause them to float to the surface. When the bubbles pop, the color sinks back to the bottom of the bottle.
What does the abreviation asa stand for chemically?.
Answer:
Acrylonitrile Styrene Acrylate
How does the ice cube feel in your hand at first? Explain in terms of heat transfer.
In your own words.
Answer:
the ice cube feels cold
Explanation:
heat transfer is like how the sun gives us and the radiation of it put heat transfer but we dont have radiation
Issue like gay marriage, abortion, and education have caused debate over the constitution because of the issue of what? (Hint: federalism)
60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf n = 7.36 \ mol}[/tex]
Explanation:
Given Data:
Volume = v = 42.19 L
Pressure = P = 428.792 kPa = 4.23 atm
Temperature = 27.871 °C + 273 = 300.871 K
R = the gas constant = 0.08206 L atm K⁻¹mol⁻¹
Required:
No. of moles = n = ?
Formula:
nRT = Pv
Solution:
Rearranging formula
[tex]\displaystyle n = \frac{Pv}{RT} \\\\n = \frac{(4.23)(42.19)}{(0.08206)(300.871)} \\\\n = \frac{181.467}{24.69} \\\\n = 7.36 \ mol\\\\\rule[225]{225}{2}[/tex]
Determine the product(s) formed when cyclohexene is treated with the following reagents
Explanation:
Big C carbon surrounded by He helium
In the reaction _Al 3O2→2Al2O3, what coefficient should be placed in front of the Al to balance the reaction? 1 2 3 4.
Answer:
D.) 4
Explanation:
Al + 3 O₂ --> 2 Al₂O₃
In the equation, there are:
Reactants: 1 Al and 6 O
Products: 4 Al and 6 O
To determine how many atoms there are of each, you multiply the coefficients by the subscripts attached to the atoms. While the question doesn't ask, as you can see, the oxygen atoms are balanced because there is an equal amount on both sides. To balance the aluminum atoms, you can get 4 aluminum atoms on the reactants side by using a coefficient of 4.
The new equation would look this this:
4 Al + 3 O₂ --> 2 Al₂O₃
There are now:
Reactants: 4 Al and 6 O
Products: 4 Al and 6 O
abcdefghijklmnopqrstuvwxyz
Answer:
dam aye someone give this person a medal
Explanation:
6. How did humans help the bison from being hunted to extinction?
Answer:
✒️Answer:Bison were saved through the combined efforts of conservationists, scientists, ranchers and ultimately the general public. As their comeback continues, I believe that they can teach us how to be better stewards of the land and provide a future for the Plains where ecosystems and human cultures thrive.
Explanation:
#CarryOnLearning[tex]watch.some.anime[/tex]
Consider the reaction 3CH4(g)→C3H8(g)+2H2(g).
Calculate ΔG at 298 K if the reaction mixture consists of 41 atm of CH4 , 0.013 atm of C3H8 , and 2.3×10−2 atm of H2 .
Given:
ΔH for...
CH4 = -74.8 C3H8 = -103.85 H2 = 0
ΔS for...
CH4 = 0.1863 C3H8 = 0.2699 H2 = 0.13058
ΔG for...
CH4 = -50.8 C3H8 = -23.4 H2 = 0
ΔG at 298 K = 128.9 kJ
From the calculations performed, the free energy change for the reaction is 72 kJ/mol.
What is the equilibrium constant?The equilibrium constant is a value that shows the extent to which reactants have been converted to products.
Given that the equation of the reaction is;
3CH4(g)→C3H8(g)+2H2(g)
Then;
PC3H8 = 0.013 atm
PH2 = 2.3×10−2 atm
PCH4 = 41 atm
Now;
ΔG = ΔG° + RTlnQ
ΔG°reaction = ΔG°products - ΔG°reactants
ΔG°reaction = [( -23.4) +2(0)] - 3(-50.8)
ΔG°reaction = 129 kJ/mol
Q = PC3H8 * PH2^2/PCH4^3
Q = 0.013 * (2.3×10−2)^2/( 41)^3
Q = 6.877 * 10^-6/68921
Q= 9.9* 10^-11
Hence;
ΔG = 129 * 10^3 + [8.314 * 298 * (ln 9.9* 10^-11 )]
ΔG = 129 * 10^3 - 57073
ΔG = 72 kJ/mol
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Explain ferromagnetism. Include what is happening to the electron in the atoms
In Ferromagnetism, materials are changed into permanent magnets.
What is Ferromagnetism?Ferromagnetism is a process in which specific materials are turned into permanent magnets. The spins of electrons are shifted and electrons become more aligned and sequence with the direction of the field.
So we can conclude that in Ferromagnetism, materials are changed into permanent magnets.
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When a solution of mgcl2 and one of agno3 are mixed, the net ionic equation is:
When a solution of MgCl₂ and a solution of AgNO₃ are mixed, the net ionic equation obtained is:
2Cl¯(aq) + 2Ag⁺(aq) —> 2AgCl(s)
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the net ionic equationIn solution
MgCl₂(aq) —> Mg²⁺(aq) + 2Cl¯(aq)
AgNO₃(aq) —> Ag⁺(aq) + NO₃¯(aq)
The reaction proceeds as follow
MgCl₂(aq) + AgNO₃(aq) —>
Mg²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO₃¯(aq) —> 2AgCl(s) + Mg²⁺(aq) + NO₃¯(aq)
Cancel out the spectator ions (i.e Mg²⁺ and NO₃¯) to obtain the net ionic equation
2Cl¯(aq) + 2Ag⁺(aq) —> 2AgCl(s)
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When a solution of MgCl₂ and one of AgNO₃ are mixed, the net ionic equation is 2Cl¯(aq) + 2Ag⁺(aq) → 2AgCl(s).
What are net ionic reactions?Net ionic reactions are those reactions in which each species are written in their respective ions form except the spectator ions.
Given chemical reaction is:
MgCl₂(aq) + 2AgNO₃(aq) → 2AgCl(s) + Mg(NO₃)₂(aq)
Ionic form of the given reaction will be written as
Mg²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO₃¯(aq) → 2AgCl(s) + Mg²⁺(aq) + NO₃¯(aq)
Spectator ions are those which are commonly present on both side of the reaction and for this reaction they are Mg²⁺ and NO₃¯. So the net ionic reaction will be:
2Cl¯(aq) + 2Ag⁺(aq) → 2AgCl(s)
Hence required net ionic reaction is 2Cl¯(aq) + 2Ag⁺(aq) → 2AgCl(s).
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If 25 milliliter of 0. 80 m hcl is used to completely neutralize 40. Milliliters of naoh solution, what is the molarity of the base?
If 25 milliliter of 0. 80M HCl is used to completely neutralize 40. milliliters of NaOH solution, the molarity of the base is 0.5M.
How to calculate molarity?The molarity of a solution can be calculated using the following expression:
M1V1 = M2V2
Where;
M1 = molarity of acidM2 = molarity of baseV1 = volume of acidV2 = volume of base25 × 0.80 = 40 × M2
20 = 40M2
M2 = 20/40
M2 = 0.5M
Therefore, if 25 milliliter of 0. 80M HCl is used to completely neutralize 40. milliliters of NaOH solution, the molarity of the base is 0.5M.
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What is the term for the heat content of a system?
Enthalpy
Entropy
Energy
Joule
Answer:
Enthalpy
Explanation:
The term entropy is used to express the particle scattering of a system.The term joule is a unit of energy.
A chemical supply company sells sulfuric acid (h2so4) in a concentration of 4. 00 m. What volume of this solution would you need to make 12. 0 ml of a 0. 50 m h2so4 solution?
Answer:
H3CS06
Explanation:
A chemical supply company sells sulfuric acid (H3CS06) in a concentration of 4.00 M. What volume of this solution would you need to make 12.0 mL of a 0.50 M H2SO4 s…
Molarity is the ratio of a mole of the solute of the substance to the liter of solution. The volume of solution required to make 12.0 ml of 0.50 M solution is 1.5 mL.
What is molar dilution?Molar dilution is the calculation of the molarity or the volume of the unknown value from the known value. It is given as,
[tex]\rm M_{1}V_{1}= \rm M_{2}V_{2}[/tex]
Given,
Initial molarity = 4.00 M
Initial volume =?
Final molarity = 0.50 M
Final volume = 12.0 mL
Substituting values in the equation:
[tex]\begin{aligned} \rm V_{1} &= \rm \dfrac{\rm M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.50 \times 12.0 }{4.00}\\\\&= 1.5 \;\rm ml\end{aligned}[/tex]
Therefore, 1.5 ml of 4.00 M sulfuric acid must be used to make 12 ml of 0.50 M solution.
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How many grams of nicl2∙6h2o will be used to prepare a 0. 0350 m, 500. 0 ml of nicl2 solution?
The mass of NiCl₂•6HO₂ needed to prepare a 0.035 M 500 mL solution of NiCl₂•6HO₂ is 4.165 g
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of NiCl₂•6HO₂Molarity = 0.035 MVolume = 500 mL = 500 / 1000 = 0.5 L Mole of NiCl₂•6HO₂ =?Mole = Molarity × Volume
Mole of NiCl₂•6HO₂ = 0.035 × 0.5
Mole of NiCl₂•6HO₂ = 0.0175 mole
How to determine the mass of NiCl₂•6HO₂Mole of NiCl₂•6HO₂ = 0.0175 moleMolar mass of NiCl₂•6HO₂ = 238 g/mol Mass of NiCl₂•6HO₂ =?Mass = mole × molar mass
Mass of NiCl₂•6HO₂ = 0.0175 × 238
Mass of NiCl₂•6HO₂ = 4.165 g
Thus, 4.165 g of NiCl₂•6HO₂ is needed to prepare the solution
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The grams of NiCl₂.6H₂O will be used to prepare a 0.0350M, 500ml of NiCl₂ solution is 2.268 grams.
How do we calculate grams from moles?Mass in grams of any substance will be calculated by using moles as:
n = W/M, where
W = given mass
M = molar mass
Moles from molarity will be calculated by using the below formula:
M = n/V, where
M = molarity of NiCl₂ solution = 0.0350M
V = volume of solution = 500mL = 0.5L
On putting values, we get
n = (0.035)(0.5) = 0.0175 mol
Now we convert these moles into grams by using the first formula as:
W = (0.0175mol)(129.6g/mol) = 2.268g
Hence required mass of NiCl₂.6H₂O is 2.268g.
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Give a difference in physical properties between the chlorine and potassium chloride
Answer:
Chlorine exists as gaseous state while potassium chloride as a solid
Physical properties between the chlorine and potassium chloride are totally different because chlorine is available in gaseous form while potassium chloride available in solid form.
What are physical properties between the chlorine and potassium chloride ?Potassium chloride crystals are composed of face-centered cubic (FCC) unit cells. KCl has a molar mass of 74.5513 grams/mol.
It has a density of 1.984 grams per cubic centimeter when it is solid and crystalline. Potassium chloride has melting and boiling temperatures of 1040 K and 1690 K.
A metal halide salt made of potassium and chlorine is known as potassium chloride. It appears as a white or colorless vitreous crystal and has no odor.
Thus, chlorine is present in gaseous state while ptassium chloride present in solid state.
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Why is the addition of cold distilled water to the container holding the aspirin you are trying to isolate a necessary step and why should this step be carried out carefully?.
Answer:
The aspirin is more soluble in ethanol than water - the water helps the crystals separate from solution.
Explanation:
Hope this helps!
What are the examples of physical chemistry?
ANSWER:
Physical chemistry is the branch of chemistry that deals with the physical structure of chemical compounds, the way they react with other matter and the bonds that hold their atoms together. An example of physical chemistry is nitric acid eating through wood.
When a 21.1 mL sample of a 0.321 M aqueous hydrofluoric acid solution is titrated with a 0.309 M aqueous barium hydroxide solution, what is the pH at the midpoint in the titration?
Answer:
formula of concentration ion.
Which of the following pH values indicates the most basic solution? A. 3 B. 7 C. 8 D. 11
is respiration like burning?Explain your answer.
Answer:
Yes
Explanation:
The process of respiration and burning are similar in the following ways: Both respiration and burning require oxygen. Energy is released during both respiration and burning. The products produced (carbon dioxide and water) are the same for both respiration and burning.
Answer:
Yes
Both Respiration and Burning uses oxygen. Both Respiration and Burning produces energy. Both Respiration and Burning gives out carbon dioxide as the end product. The overall chemical reactions of both Respiration and Burning are the same.
Explanation:
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What is the meaning of N, E, M, and S in periodic table Need ASAP!
Answer:
Molybdenum is M, Einsteinium is E, and N is Nitrogen. Lastly, S is sulfur.
A chemistry teacher adds 50. 0 mL of 1. 50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution? Use M subscript i V subscript i equals M subscript f V subscript f. 0. 300 M 0. 375 M 6. 00 M 7. 50 M.
The concentration of the final solution after mixing water into the H₂SO₄ is 0.375 M.
How do we calculate the concentration?Concentration in terms of molarity will be calculated by using the below formula as:
M₁V₁ = M₂V₂, where
M₁ = molarity of H₂SO₄ = 1.50 M
V₁ = volume of H₂SO₄ = 50 mL
M₂ = molarity of water = ?
V₂ = volume of water = 200 mL
On putting all values on the above equation, we get
M₂ = (1.50)(50) / (200) = 0.375 M
Hence option (2) is correct.
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