Answers
1) Percent by volume.
\(\%=\frac{millilitersofsolute_{}}{millilitersofsolution_{}}\cdot100_{}\)List known values
Solute: methyl alcohol
Solution: 1.30 L.
Convert L into mL
\(L=1.30L\cdot\frac{1000mL}{1.00L}=1300mL\)2) Plug in known values
\(18.5\%=\frac{\text{milliliters of methyl alcohol}}{1300mL}\cdot100\)3) Solve for volume of methyl alcohol.
\(18.5\%\cdot\frac{1300mL}{100}=\frac{milliliters\text{ of methyl alcohol}}{1300mL}\cdot100\cdot\frac{1300mL}{100}\)\(mL\text{ methyl alcohol=18.5}\%\cdot\frac{1300mL}{100}=240.5mL\text{ methyl alcohol}\)The bottle contains 240.5mL of methyl alcohol.
Related Questions
what is the products of the reaction between 2-methylbut-2-ene and HCL 1b. write the IUPAC names of the product of the reaction; above 2. what is the product formed when cyclohexane is reacted with chlorine 2b write the structural formula and the IUPAC names of the products; above 3a when pentyne is reacted with hydrogen gas,what products is formed 3b write the structural formula and the IUPAC names of the products
Answers
Answer:
Explanation:
2 - chloro-2-methylbutane
QUESTION 6 Calculate the molality of the HCI (aq) using the below information: Formula weight (g/mol): 36.465 Density of the solution (g/ml): 1.19 Weight %: 37.2 Molarity: 12.1 Your answer should have 3 sf) QUESTION 7 Calculate the molality of the NH3(aq)
Answers
A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.
What is molality?Molality is defined as the total moles of a solute contained in a kilogram of a solvent.
Let's suppose we have 1 L of the solution.
Step 1: Calculate the moles and mass of HCl (solute) in 1 L of solution.The solution is 12.1 M, that is, there are 12.1 moles of HCl in 1 L of solution.
The molar mass of HCl is 36.465 g/mol.
12.1 mol × 36.465 g/mol = 441 g
Step 2: Calculate the mass corresponding to 1 L of solution.The density of the solution is 1.19 g/mL.
1000 mL × 1.19 g/mL = 1190 g
Step 3: Calculate the mass of water (solvent) in 1190 g of solution.In 1190 g of solution, there are 441 g of HCl.
mWater = 1190 g - 441 g = 749 g = 0.749 kg
Step 4: Calculate the molality (b) of the solution.b = 12.1 mol / 0.749 kg = 16.1 m
A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.
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which part of the hunman body controls the nervous system
Answers
Explanation:
The brain is like a computer that controls the body's functions, and the nervous system is like a network that relays messages to parts of the body. Click through this slideshow to learn more about the brain and nervous system.
A(n) __________ occurs when the moon enters the umbral shadow of the earth without being entirely immersed in it.
partial lunar eclipse
total lunar eclipse
annular eclipse
Answers
A weather balloon has a volume of 556 L when filled with helium at 30 C at a pressure of 386 torr. What is the new volume of the balloon (in liters) if the balloon rises to a point where the air
pressure is 229 torr and the temperature is -9 C
Answers
The new volume of the balloon will be 484.43 L.
This is an example of Charles' law, sometimes called the temperature-volume law. It states that the volume of a gas is directly proportional to the Kelvin temperature, while pressure and amount are held constant.
The equation is V1/T1=V2/T2, where V is volume and T is temperature in Kelvins.
Known
V1=556 L
T1=30∘C+273.15=303 K
T2=-9∘C+273.15=264 K
Unknown
V2
Solution
Rearrange the equation to isolate V2. Substitute the known values into the equation and solve.
V2=V1T2/T1
V2=(556L×264K)/303K=484.43 L.
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Photoelectron spectroscopy typically measures the binding energy of electrons in units of
MJ/mol
. Use the value for the energy of an electron in a hydrogen atom in the ground state that you just calculated using the Bohr model to predict the binding energy for the electron in hydrogen in units of
MJ/mol
. Note: If you are not sure where to start to answer this question, click on the "Extra Info" button. Binding energy for the electron in hydrogen predicted by the Bohr model
=
MJ/mol
Check your calculated value. To answer this question, remember that
E binding =−E e−
​ . It can also be helpful to think of the units for the energy of the electron as J/electron, while the units for the binding energy are
MJ/mol
of electrons. You will need Avogadro's number and conversion factor for the prefix mega (M).
Previous question
Answers
The predicted binding energy for the electron in hydrogen in units of MJ/mol is -13.6 MJ/mol.
Using the value for the energy of an electron in a hydrogen atom in the ground state calculated using the Bohr model, we have:
E_binding = -E_electron = -(13.6 eV) = -2.18 × 10²-18 J/electron
To convert from J/electron to MJ/mol, we can use the following conversions:
1 J/electron * (1 mol/6.022 x 10²23 electrons) = 1.66 x 10²-24 J/mol
1 MJ = 10²6 J
So, putting it all together:
E_binding = (-2.18 x 10²-18 J/electron) * (1 mol/6.022 x 10²23 electrons) * (10²-6 MJ/1 J) = -13.6 MJ/mol
Therefore, the predicted binding energy for the electron in hydrogen in units of MJ/mol is -13.6 MJ/mol.
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what is the multiplicity of the methylene hydrogens indicatedi nthe proton nmr of the following compound
Answers
The multiplicity of the methylene hydrogens indicated in the proton NMR of the given compound is triplet. This is because the methylene hydrogens are equivalent and the NMR will show a triplet peak due to their similar chemical environment. The peak will be split into three lines by the coupling of the adjacent protons.
If the apparent air temperature is 28 °C, what is the temperature in kelvins?
Answers
Explanation: Formula for solving Celsius to Kelvin is C + 273.15
Where C is Celsius
Question 10
A particular reaction has a standard molar reaction enthalpy of
−
4362
kJ mol
−
1
−4362 kJ mol
−1
and a standard molar reaction entropy of
+
21.6
J K
−
1
mol
−
1
+21.6 J K
−1
mol
−1
both at
298
K
298 K. What is the thermodynamic equilibrium constant for the reaction at
298
K
298 K? (Note, rounding errors will have a profound effect of
the value calculated.)
Answers
Answer:use chatgpt
Explanation:it works
At 298 K, the thermodynamic equilibrium constant for the reaction is approximately 1.23 × 10^7.
To calculate the thermodynamic equilibrium constant (K) for the reaction at 298 K, we can use the equation:
ΔG° = -RT ln K
Where ΔG° is the standard Gibbs free energy change, R is the gas constant (8.314 J/(mol·K)), T is the temperature in Kelvin, and ln represents the natural logarithm.
Given that the standard molar reaction entropy (ΔS°) is +21.6 J/(K·mol) and the standard molar reaction enthalpy (ΔH°) is -4362 kJ/mol, we can calculate ΔG° using the equation:
ΔG° = ΔH° - TΔS°
Converting the units:
ΔG° = (-4362 kJ/mol) - (298 K) * (21.6 J/(K·mol))
ΔG° = -4362 kJ/mol - 6448.8 J/mol
ΔG° = -4362 kJ/mol - 6.4488 kJ/mol
ΔG° = -4368.4488 kJ/mol
Now, substituting the values into the equilibrium constant equation:
-4368.4488 kJ/mol = -8.314 J/(mol·K) * 298 K * ln K
Dividing both sides by -8.314 J/(mol·K) * 298 K:
ln K = (-4368.4488 kJ/mol) / (-8.314 J/(mol·K) * 298 K)
Calculating the right-hand side of the equation:
ln K ≈ 16.41
Finally, taking the exponential of both sides to solve for K:
K ≈ e^(ln K)
K ≈ e^(16.41)
K ≈ 1.23 × 10^7
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A continous fractionating column separates 1500 kg/h of a solution of benzene and toluene containing 0.75 mass benzene into an overhead product containing 0.925 mass fraction benzene and bottom product containing 0.075 mass fraction of benzene. A reflux ration of 2.5 kg of reflux per kg of product is to be used. Calculate the quanity of top and bottom product in kg/h.
Answers
The quantity of the top product is approximately 1483.4 kg/h, and the quantity of the bottom product is approximately 1116.7 kg/h.
What is the quantity of top and bottom products in kg/h?We solve using the concept of material balances.
Given:
F = Feed rate of the solution (benzene + toluene) = 1500 kg/h
Fb = Feed rate of benzene in the feed = 0.75 * F = 1125 kg/h
Ft = Feed rate of toluene in the feed = F - Fb = 375 kg/h
Benzene Balance:
Fb = Bt + Bb
where Bt is the flow rate of benzene in the top product and Bb is the flow rate of benzene in the bottom product.
1125 kg/h = Bt + Bb
Toluene Balance:
The mass balance equation for toluene can be written as:
Ft = Tt + Tb
where Tt is the flow rate of toluene in the top product and Tb is the flow rate of toluene in the bottom product.
375 kg/h = Tt + Tb
The reflux ratio is given as 2.5 kg reflux per kg of product
The total product flow rate (Pt) will be:
Pt = Bt + Tt = Bb + Tb
Therefore, the reflux flow rate (R) is:
R = 2.5 * Pt
Solving the equations, we find:
Bt = 1116.7 kg/h
Tb = 8.3 kg/h
Top Product Flow Rate = Bt + Tt = Bt + (Ft - Tb) = Bt + (375 - 8.3) = 1116.7 + 366.7 = 1483.4 kg/h
Bottom Product Flow Rate = Bb + Tb = 1125 - 8.3 = 1116.7 kg/h
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a cube of iron pyrite is 0.31 cm on each side and has a mass of 0.040g. what is the density of the sample?
Answers
The density of the iron pyrite cube is 1.343 g/cm³.
Given,
Side of iron pyrite cube = 0.31 cm
Mass of iron pyrite = 0.040 g
The volume of iron pyrite cube = s³ cm³
Or, volume = 0.029791 cm³
We have to find the density of the sample.
Density is defined as the mass per unit volume. Or, it is the ratio of mass to the volume of the substance.
Using the formula for density, we get,
Density = mass/volume
Or, density = 0.40/0.029791
Or, density = 1.343 g/cm³
Hence, the density of the iron pyrite cube is 1.343 g/cm³.
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define perodic table what are period and groups
Answers
Answer:
period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left.
Explanation:
maaf kalo salah
In model periodic table the atoms are arranged wrt atomic number, there chemical behaviour, and properties.
The horizontal rows of periodic table are known as periods.
The vertical line of periodic table are knows as groups.
How is the rate of a reaction affected when the temperature increases?
A. The rate decreases because the reactant particles move too
quickly to react.
B. The rate increases because the equilibrium constant increases.
C. The rate increases because the reactant particles collide more
often.
D. The rate decreases because the products reform the reactants more quickly
more quickly.
Answers
The rate of reaction increases when the temperature increases because the reactant particles collide more often and the correct option is option C.
What is Rate of reaction?
The rate of reaction refers to the speed at which the products are formed from the reactants in a chemical reaction. It gives some insight into the time frame under which a reaction can be completed.
The rate or speed of reaction can be defined as the change in the concentration of any one of the reactants or products per unit time.
The rate is higher at higher temperatures because colliding particles will have the required activation energy at high temperature and more successful collisions will take place.
Therefore, The rate of reaction increases when the temperature increases because the reactant particles collide more often and the correct option is option C.
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What is most often the next step if scientific evidence is established that does not support an accepted theory?
Answers
Answer:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.
Explanation:
A sample of a certain lead compound contains 12.92 g of lead for 2 g of oxygen. A second sample has mass of 34.27 g and contains 14.39 g of oxygen. Are the two compound the same
Answers
The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
What is a chemical compound?A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.
What are the calculations?sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .
sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .
so, the ratios are not the same.
Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
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Chemistry balancing equations - Can this be solved???
find k given [S0₂ 2] =1.50 M, [O₂] = 1.25 M [SO₃] = 3.50 M 2 SO₂ + 1 O₂ ← →2 SO₃
Answers
The value of K is 4.4 represents the equilibrium position of the reaction under the given conditions.
The equilibrium constant (K) for a reaction is a constant value that relates the concentrations of the reactants and products at equilibrium. For the given reaction, the equilibrium concentrations of SO₂, O₂, and SO₃ are given as [SO₂] = 1.50 M, [O₂] = 1.25 M, and [SO₃] = 3.50 M, respectively.
The equilibrium constant (K) for the reaction can be calculated using the equilibrium concentrations of the reactants and products.
K = [SO₃]²/([SO₂]²[O₂])
K = (3.50)²/[(1.50)²(1.25)]
K = 4.48
Therefore, the equilibrium constant (K) for the reaction is 4.48.
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What is the distinction between electronic and ionic conduction? Answer: When a current arises from a flow of Choose the answer from the menu for the missing word in the middle of the sentence in accordance to the question statement electrons , the conduction is termed electronic; for ionic conduction, the current results from the net motion of Choose the answer from the menu for the missing word at the end of the sentence in accordance to the question statement ions .
Answers
Answer:
Electronic conduction is the movement of electrons whereas ionic conduction is the movement of ions.
Explanation:
When a current arises from a flow of electrons, the conduction is termed as electronic conduction while on the other hand, for ionic conduction, the current results from the net motion of ions from one atom to another. The difference between electronic and ionic conduction is that electronic conduction refers to the movement of electrons from one region to another, whereas ionic conduction is the movement of ions from one atom to another during bond formation.
help i’ll give u points
Answers
Answer:
60ug
Explanation:
If it has experienced two half lives, that means it has been halved twice. in that case, to undo it, just multiply it by two twice. 0.15ug * 2 = 0.30ug. 0.30ug * 2 = 0.60ug. Hope this helps.
7. What is the pH of [OH-] = 1.0 * 10-5 solution?
О
1
5
14
9
Answers
Answer:
I'd 9 Coz is better than anything else I help so u need to other people that question don't be jealous of them
Compare the shape of a chemical signalling molecule and a receptor.
Answers
Cell signalling is a process by which cells communicate with each other and transfer messages.
What is a receptor?A molecule inside or on the surface of a cell binds to a specific substance and causes a specific effect in the cell.
Cell signalling is a process by which cells communicate with each other and transfer messages. When a signal molecule binds to a receptor protein, changes occur in the receptor proteins. Two changes are listed below:
1. The receptor protein undergoes conformational changes and acts as an enzyme.
2. The receptor protein that makes a second messenger molecule that leads the reaction further to other cells or molecules.
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A solution made by dissolving 9.81 g of a nonvolatile, nonelectrolyte in 90.0 g of water boiled at 100.37 °C at 760 mm Hg. What is the molar mass of the substance? [kp = 0.51 °c/m]
Answers
Answer:
151 g/mol
Explanation:
In order to solve this problem we need to keep in mind the formula for the boiling point elevation:
ΔT = Kb * m * iWhere:
ΔT is the temperature difference between the boiling point of the solution and that of pure water. 100.37 °C - 100.00 °C = 0.37 °C.m is the molarity of the solutioni is the van't Hoff factor. As the solute is a nonelectrolyte, the factor is 1.Input the data and calculate m:
0.37 °C = 0.51 °C/m * m * 1 m =0.72 mWe now can calculate the number of moles of the substance, using the definition of molarity:
molarity = moles of solute / kg of solventIn this case kg of solvent = 90.0 g / 1000 = 0.090 kg
0.72 m = moles / 0.090 kgmoles = 0.065 molFinally we calculate the molar mass, using the number of moles and the mass:
9.81 g / 0.065 mol = 151 g/molDraw all structural and geometric isomers of butene and name them
Answers
Alkene is an unsaturated hydrocarbon which contain at least one carbon-carbon double bond. Here butene is an alkene with the chemical formula C₄H₈. The functional group present in alkenes is the double bond.
The structural isomers are those isomers in which the atoms are completely arranged in a different order but have the same molecular formulas. It is also called the constitutional isomers.
Geometric isomers are two or more compounds with the same number and types of atoms and bonds but have different geometries for the atoms.
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After doing a correct and careful recrystallization, you isolate your product by filtration. Which of the following will be present in the mother liquor? (select all that apply)
a. Impurities
b. Large amount of product
c. Recrystallizing solvent
d. Small amount of produc
Answers
Answer:
a. Impurities
c. Recrystallizing solvent
Explanation:
In this type of reaction the products are never considered totally pure, that is why as a final product it must always be taken into account that it is proportional, it will be a recrystallization solvent and other impurities with which the products were mixed.
What wavelength (in nm) of photon absorbed when an electron transitions from then = 2 to the n = 21 state?Using-2.998 for light
Answers
ANSWER
The wavelength of the photon is 367.87 nm
EXPLANATION
Given information
\(Speed\text{ of light = 2.998 }\times\text{ 10}^8\text{ m/s}\)To find the wavelength of the photon absorbed, we will need to find the change in energy in transition using the below formula
\(E_n\text{ = -2.18 }\times\text{ 10}^{-18}\text{ }(\frac{1}{n^2})\)From the question, the energy states given are from n = 21 to n =2
So, we can calculate the value of energy below
\(E_{21}\text{ - E}_2\text{ = }\Delta E\)\(\begin{gathered} \Delta E\text{ = -2.18 }\times\text{ 10}^{-18}\text{ }(\frac{1}{21^2}-\frac{1}{2^2}) \\ \Delta E\text{ = -2.18 }\times10^{-18}(\frac{1}{441}-\frac{1}{4}) \\ \Delta E\text{ = -2.18}\times10^{-18}(0.0022675737\text{ - 0.25}) \\ \Delta E\text{ = -2.18}\times10^{-18}\text{ }(-0.2477324263) \\ \Delta E\text{ = -2.18}\times10^{-18}\times(-2.477324263\times10^{-1}) \\ \Delta E\text{ = 2.18}\times2.477324263\times10^{-18-1} \\ \Delta E\text{ = 5.400}\times10^{-19}J \end{gathered}\)Since we have gotten the value of the energy, hence, we can now calculate the wavelength of the photon using the below formula
\(\begin{gathered} \Delta E=\frac{hc}{\lambda} \\ Where \\ h\text{ = Planck's constant} \\ c\text{ = speed of light} \\ \lambda\text{ = wavelength} \end{gathered}\)Recall,
h = 6.626 x 10^-34 J.s
c = 2.998 x 10^8 m/s
\(\begin{gathered} \lambda=\frac{hc}{\Delta E} \\ \frac{}{} \\ \lambda=\frac{6.626\times10^{-34}\times2.998\times10^8}{5.40\times10^{-19}} \\ \lambda=\frac{6.626\times2.998\times10^{-34+8}}{5.40\times10^{-19}} \\ \\ \lambda=\frac{19.865\times10^{-26+19}}{5.400} \\ \lambda=\frac{19.865}{5.40}\times10^{-26+19} \\ \lambda=3.6787\text{ }\times10^{-7} \\ \lambda=\text{ 367.87nm} \end{gathered}\)Hence, the wavelength of the photon is 367.87 nm
TiCl4+H2O-->TiO2+HCl I need to balance this
Answers
Answer: The answer is TiCl4 + 2H2O --> TiO2 + 4HCl
Explanation: Every element is equal on both sides.
Ti- 1 Ti-1
Cl- 4 Cl-4
H- 4 H-4
O- 2 O-2
How many grams of water are produced if you combust 1.28 g of C6H14? The balanced equation is:
2C6H14 + 1902 - 12C02 + 14H2O
Answers
Answer:
Explanation:
according to the balance chemical equation
2 moles of c6h14 give us 14 moles of H2O
now mass(in gram) of 2 moles of C6H14 is
moles=mass/molar mass
mass=molar mass*moles
molar mass of C6H14 is 86 therefore
mass=86*2=172
now mass of 14 moles of water is
mass=molar mass*moles
molar mass of water is 18
mass=18*14=252
from the above calculations we conclude that
172 grams of C6H14 produce 252 grams of water
so 1.28 grams of C6H14 produce =252*1.28/172=1.87 grams of water
result is that 1.28 grams of C6H14 produced 1.87 grams of water
A bomb calorimeter with a heat capacity of 837 J∘C contains 745 g of water. It burns 2.50 g C8H18 resulting in the temperature going from 15.0∘C to 33.8∘C. What is the value of the heat transferred (in kilojoules) by the reaction from the perspective of the system?
Answers
Answer:
74.3kJ are transeferred
Explanation:
In the bomb calorimeter, the burning of C₈H₁₈ is producing heat that is been absorbed for the calorimeter and the water.
Heat absorbed calorimeter:
837J/°C * (33.8°C-15.0°C) = 15735.6J
Heat absorbed water:
C*m*ΔT
C specific heat of water (4.184J/g°C), m is mass of water (745g), and ΔT change in temperature (33.8°C - 15°C = 18.8°C)
4.184J/g°C*745g*18.8°C = 58601.1J
Heat released by the reaction:
15735.6J + 58601.1J = 74336.7J
74.3kJ are transeferred
What are the best practices while sharing a lab balance with other students? Select one or more: Leave a note when you have tared a balance for your glassware. Brush off any chemical dust around the balance after each use. Alert your TA or instructor about any issues with the balance. Place samples directly onto the balance.
Answers
Answer:
Brush off any chemical dust around the balance after each useAlert your TA or instructor about any issues with the balanceExplanation:
The best practices while sharing a lab balance with other students includes alerting your TA or instructor about issues with the balance and Brushing off any chemical dust around the balance after each use. the practices will help to avert/reduce the work hazards associated with working with a balance.
Brushing off any chemical dust after each use will reduce the chemical hazards in the lab while Alerting your instructor about any issues with the balance helps to eliminate mechanical hazards that a faulty balance can pose
what is a valency according to chemistry
Answers
Answer:
Valency is the measure of the combining power of an element
Zeros between nonzero digits are significant
Answers
Answer:
Explanation:
If a zero is found between significant digits, it is significant