The enthalpy of vaporization for Benzene is 30.8 kJ/mol. 39.42 kJ is the energy change when 100g of Benzene boils at 80.1 degrees Celsius.
What is Enthalpy of Vaporization ?The amount of enthalpy or energy that must be added to a liquid substance into gas substance is called Enthalpy of Vaporization. It is also known as Latent heat of vaporization.
How to find the energy change from enthalpy of vaporization ?To calculate the energy use this expression:
[tex]Q = n \Delta H_{\text{vapo.}[/tex]
where,
Q = Energy change
n = number of moles
[tex]\Delta H_{\text{Vapo.}}[/tex] = Molar enthalpy of vaporization
Now find the number of moles
Number of moles (n) = [tex]\frac{\text{Given Mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{100\ g }{78\ g/mol}[/tex]
= 1.28 mol
Now put the values in above formula we get
[tex]Q = n \Delta H_{\text{vapo.}[/tex]
= 1.28 mol × 30.8 kJ/mol
= 39.42 kJ
Thus from the above conclusion we can say that The enthalpy of vaporization for Benzene is 30.8 kJ/mol. 39.42 kJ is the energy change when 100g of Benzene boils at 80.1 degrees Celsius.
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Question: The enthalpy of vaporization for Benzene is 30.8 kJ/mol. What is the energy change when 100g of Benzene boils at 80.1 degrees Celsius?
You start with 2.5g of magnesium and add it to 400mL of CO2 at 23 o C and 1atm. How many grams of magnesium oxide will be formed?
Answer:
0.664 g are formed by the reaction.
Explanation:
First of all, we determine the reaction:
Mg + CO₂ → MgO + CO
We need to determine the moles of the CO₂ by the Ideal Gases Law.
We convert to L, the volume → 400 mL = 0.4L
T° → 23°C + 273 = 296K
P . V = n . R .T
n = P . V / R .T
n = (1 atm . 0.4L) / (0.082 . 296K) → 0.0165 moles
Moles of Mg → 2.5 g . 1mol / 24.3g = 0.103 moles
As ratio is 1:1, CO₂ is the limiting reactant.
For 1 mol of Mg, we need 1 mol of gas
Then, for 0.103 moles of Mg, we need 0.103 moles of gas, but we only have 0.0165 moles.
If we see the product side, ratio is also 1:1
0.0165 moles of CO₂ must produce 0.0165 moles of MgO.
We convert the moles to mass → 0.0165 mol . 40.3 g /1mol = 0.664 g
1) Write the symbol and charge for each individual ion
2) Balance the charge so that they equal to zero
3)Write the formula based on how many of each ion you used in step 2
11) Beryllium and Phosphorus
12) cesium and Sulfur
13) Lithium and phosphorus
14) fluorine and rubidium
15) Francium and oxygen
Answer:
I'm pretty sure these are correct
11) Be 2+ and P 3- Formula is Be3P2
12) Cs 1+ and S 2- Formula: Cs2S
13) Li 1+ and P 3- Formula: Li3P
14) Rb 1+ and F 1- Formula: RbF
15) Fr 1+ and O 2- Formula: Fr2O
Explanation:
You do the criss-cross method where the charge on one ion becomes the amount on the second
Please help: A complete moon cycle is how many weeks
Answer:
29.5 days
Explanation:
its 29.5 days i hope it helps
Answer:
The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 day
what is the equation for hydrogen peroxide
Answer:
H2O2
Explanation:
2 hydrogen, 2 oxygen wikipedia it
Answer:
hey!
Your answer is that the equation for Hydrogen Peroxide is [tex]H_{2}[/tex][tex]O_{2}[/tex]
Explanation:
Its formed when [tex]H_{2}[/tex]O and [tex]O_{2}[/tex] react chemically together!
HOPE THIS HELPED!
Dona is attempting to make an electromagnetic to pick up old nails in her driveway. Which of these materials would be best to us for the core to make the strongest electromagnetic to pick up the most nails?
Answer:
The materials would be best to us for the core to make the strongest electromagnetic to pick up the most nails is described below in detail.
Explanation:
Use a couple of wire strip-pers to exclude some centimeters of insulation from every end of the cable. Skillfully cover the cable around the nail. The more cable you enclose around the nail, the more effective your electromagnet will be. Compose certain that you leave sufficient of the cable unwrapped so that you can connect the battery.
After the shuttle disaster, an unknown compound residue was removed from a piece of the debris. Upon analysis, it was found to contain 2.61 g of carbon, 6.09 g of nitrogen, and 1.31 g of hydrogen. What is its empirical formula?
Answer:
The final empirical formula is [tex]C_2 N_5 H[/tex]
Explanation:
Given
The amount of carbon, nitrogen and hydrogen in a given compound is as follows
C:N:H
[tex]2.61 : 6.09 : 1.31[/tex]
On simplifying the ration values we get
[tex]\frac{2.61}{1.31} : \frac{6.09}{1.31} : \frac{1.31}{1.31}[/tex]
So the final ratio is
[tex]2 : 5 : 1[/tex]
The final empirical formula is [tex]C_2 N_5 H[/tex]
how does a allergy develop?
PLEASE HELP!
Answer: im not fully sure but from what i rememeber Allergies develop when your immune system mistakenly identifies a thing such as pollen, mold or food as harmful then your body reacts to it
Explanation:
How does fertilizer affect nitrogen cycle
Cuando se usa demasiado fertilizante para las plantas una parte de ese nitrógeno no vuelve a la atmósfera y a cambio contamina el medio ambiente
Explanation:
the nitrogen cycle is a natural process that adds nitrogen to the soil. however the use of fertilizer has increased the amount of usable nitrogen in the soil
Which two ways the nervous and endocrine systems interact?
Answer:
Along with the nervous system, the endocrine system coordinates the body's functions to maintain homeostasis during rest and exercise. The nervous and endocrine systems also work together to initiate and control movement, and all the physiological processes movement involves.
Explanation:
5.
Given: C2H5C1
P1: 951.72 kPa
P2: 362.29 kPa
T1: 653.34 K
Wanted: kelvins?
Answer: The final temperature is 248.7 K
Explanation:
To calculate the final temperature of the system, we use the equation given by Gay lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.
Mathematically,
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
where,
[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.
[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.
We are given:
[tex]P_1=951.72kPa\\T_1=653.34K\\P_2=362.29kPa\\T_2=?[/tex]
Putting values in above equation, we get:
[tex]\frac{951.72}{653.34}=\frac{362.29}{T_2}\\\\T_2=248.7K[/tex]
Thus the final temperature is 248.7 K
mass-mass problem:
If 25.0 grams of carbon dioxide are used in photosynthesis how many grams of glucose (C6H12O6) could be Produced according
to the following equation : 6CO2 + 6H2O → C6H12O6 + 602
Answer:
17.05 g of glucose
Explanation:
The equation of the reaction is given as;
6CO2 + 6H2O → C6H12O6 + 602
From the equation;
6 mol of CO2 produces 1 mol of C6H12O6
Converting to masses;
CO2:
Mass =Number of moles * Molar mass
Mass = 6 mol * 44 g/mol = 264 g
C6H12O6:
Mass = Number of moles * Molar mass
Mass = 1 mol * 180 g/mol = 180 g
This means 264g of CO2 produces 180g of C6H12O6
25g of CO2 would produce x g of C6H12O6
264 = 180
25 = x
x = 25 * 180 / 264
x = 17.05 g
Please help with chem ASAP
Answer:
Imagine Dragon
Explanation:
These balls across yo face
Gottem
What is a song that gets you in a mood? ;)
Answer:
Uhm- s-- money- feelings- die? But, slowed -w-
Explanation:
A sample of Oxygen gas is in a cylinder at constant temperature. What would happen to the pressure of the gas if the volume was
smooshed down to half its original size? Decreasing the volume by a factor of 2.
Answer:
This means that the pressure would become double of it's initial pressure.
Explanation:
Key statements:
- Constant temperature
- What happens to the pressure of the gas if the volume was
smooshed down to half its original size?
Basically the question is asking about the relationship between pressure and volume at constant temperature. This is given by Boyle's law.
Boyle's law states that the volume of a fixed mass of gas is inversely proportional to it's volume at a fixed temperature.
This is given by;
P1V1 = P2V2
Where;
P1 = Initial pressure
P2 = Final pressure
V1 = Initial Volume
V2 = Final Volume
From the question;
V2 = V1/2
Inserting it into the equation;
P1 V1 = P2 V1/2
Divide all through by V1
P1 = P2 /2
P2 = 2 P1
This means that the pressure would become double of it's initial pressure.
A gas in a piston starts out with a volume of 156 mL, a temperature of 28.1° C, and a pressure of 1.12 atm. If it ends with a volume of 312 mL and a temperature of 87.2° C, what is the new pressure?
Answer:
0.67atm is the new pressure of the gas
Explanation:
To find one condition of a gas when pressure, volume and absolute temperature change we must use combined gas law:
[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
Where P is pressure, V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.
Replacing:
P₁ = 1.12atm
V₁ = 156mL
T₁ = 28.1°C + 273.15K = 301.25K
P₂ = ?
V₂ = 312mL
T₂ = 87.2°C + 273.15 = 360.35K
1.12atm*156mL / 301.25K = P₂*312mL / 360.35K
P₂ = 0.67atm is the new pressure of the gas
Single strand RNA is made using the genetic instructions from double strand DNA.
Proteins are made from the instructions in RNA.
True
False
45 grams of ammonia, NH3, in 0.75 L of solution.
i really need help with this
Answer:
the process shown here is endocytosis.
Explanation:
endocytosis is a process of taking something inside the cell..
How do parasites affect their hosts?
They help their hosts by consuming or using their cells.
They help their hosts by growing in size.
O They harm their hosts by growing in size.
They harm their hosts by using their hosts as a food source.
Explain why a halogen bulb has a longer bulb life than a traditional incandescent bulb filled with argon.
Answer:
The halogen bulb lasts longer because the filament lasts longer. It can have twice the life of an incandescent and use the same amount or slightly less (10%) electricity.
Explanation:
This is for Earth/Space Science. Please help me and thank you in advance. I need this quickly please and thank you.
Which statement describes the solar feature shooting off into space labeled C?
1. A brief eruption of intense high-energy radiation from the sun's surface
2. A dark spot appearing from time to time on the sun's surface
3. A stream of glowing gas that shoots out from the sun in an arch
4. An envelope of plasma surrounding the sun
In the chemical equation, H202-H2O + O2, the H2O2 is a
reactant
catalyst
product
solid
Answer:
product
Explanation:
Since the speed of light, “c”, is 0.3% slower in air than it is in outer space, how does that affect the observed wavelengths?
Answer:
....interesting
I need help with this question ASAP
Answer:
True
Explanation:
Asexual reproduction does not involve sex cells or fertilization . Only one parent is required, unlike sexual reproduction which needs two parents. As a result, the offspring are genetically identical to the parent and to each other.
How many grams of carbon is needed to react with hydrogen gas to produce 59.8 grams of acetylene (C2H2)?
Answer:
[tex]55.1657[/tex] grams/mol of carbon is needed to react with hydrogen gas to produce 59.8 grams of acetylene (C2H2)
Explanation:
The molecular weight of acetylene is 26.04 g/mol
Molecular weight of carbon is equal to 12.011 g/mol
Two carbon atom produces one acetylene molecule.
Thus, 2 * 12.011 g/mol of carbon is used to produce 26.04 g/mol of acetylene,
Amount of carbon required to produce 59.8 grams of acetylene
[tex]\frac{2*12.011}{26.04} * 59.8 \\= 55.1657[/tex]grams/mol
[tex]55.1657[/tex] grams/mol of carbon is needed to react with hydrogen gas to produce 59.8 grams of acetylene (C2H2)
What type of energy transformation happens during photosynthesis?
(select the BEST answer choice
thermal --> radiant
chemical --> radiant
chemical --> thermal
radiant --> chemical
Answer:
radiant - chemical is the best answer
Convert 6.03 m to km using Dimensional Analysis
Explanation:
[tex]6.03 \: m \times \frac{1 \: km}{1000 \: m} = 0.00603 \: km[/tex]
Every ________ will have its own unique set of quantum numbers.
Select the correct answer below:
A. atom
B. shell of electrons
C.proton
D. individual electron
Answer:
D. individual electron
Explanation:
Every individual electron will have its own unique set of quantum numbers.
What are quantum numbers?
Quantum numbers are the numbers which describe the values of conserved quantities with respect to the dynamics of a quantum system.They correspond to the Eigen values of operators which commute with the Hamiltonian quantities.
The Hamiltonian quantities can be known with precision simultaneously with the system's energy.Quantum numbers can take values of discrete sets of integers or even half-integers even though they can approach infinity in some cases.
They can specifically describe energy levels of electrons, and can also explain angular momentum,spin,etc.These are used to describe the path of an electron in an atom ,when the quantum numbers of all atoms are combined they must comply with the Schrodinger equation.
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1. Which of the following is the most important function of the microscope?
A. measuring specimen
B. magnification of the specimen
C. photographing the specimen
D. locating and viewing the specimen
image or
A student investigated temperature changes during a reaction. Figure 2 shows the apparatus the student usesWhat is the biggest error in this investigation.Suggest two improvements to the apparatus which would increase the accuracy of the experiment.
[3 marks]
Answer:
it is becuse the students used wrong apparatus
The biggest error in this investigation is the use of inappropriate types of equipment.
The types of equipment used in the given setup are inappropriate. Suggested improvements in the apparatus to increase the accuracy are given below:
1. The use of a polystyrene cup in the laboratory for any reaction is inappropriate. As a slight increase in temperature causes the decomposition of the chemicals in the cup as well.
2. The use of a thermometer stand is a must. Without using the stand, the tip of the thermometer touches the lid of the container, which causes inaccuracies in the result.
Hence, all the suggestions are listed above.
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