What is the thermal energy needed to vaporize 18.02g of water at 100°C? The Heat of Vaporization for water is 40.650 kJ/mol.
Answer:
40.7 kJ
Explanation:
Applying,
q = c'n.................. Equation 1
Where q = Thermal Heat, c' = Heat of vaporization of water, n = number of mole of water.
But,
n = mass(m)/Molar mass(m')
n = m/m'............... Equation 2
Substitute equation 2 into equation 1
q = c'(m/m')............. Equation 3
Given: c' = 40.650 KJ/mol, m = 18.02 g
Constant: m' = 18 g/mol
Substitute into equation 3
q = 40.650(18.02/18)
q = 40.695 kJ
q ≈ 40.7 kJ
Please help I’ll mark you brainiest if it’s correct. There is 3 answers to this one!
Answer:
c,e,f
Explanation:
Judging by what i tried to find out about this reaction, it seems that won't take place, though it could be wrong.
a container contains 5L of nitrogen gas at 25°C. what will be it's volume if the temperature increases by 35°C keeping the pressure constant
Answer:
5.168 L
Explanation:
Applying Charles Law,
V/T = V'/T'..................... Equation 1
Where V = Initial Volume, T = Initial Temperature in Kelvin, V' = Final Volume, T' = Final Temperature in Kelvin,
Make V' the subject of the equation,
V' = VT'/T................. Equation 2
From the question,
Given: V = 5L, T = 25°C = (25+273) = 298K, T' = 35°C = (35+273) = 308K
Substitute these values into equation 2
V' = (5×308)/298
V' = 5.168 L
What area of mathematics is used to calculate parallax?
algebra
geometry
calculus
trigonometry
Answer:
algebra
Explanation:
The parallax formula states that the distance to a star is equal to 1 divided by the parallax angle,
p
, where
p
is measured in arc-seconds, and
d
is parsecs.
I'm positive that the answer is trigonometry.
Refer to the following passage that I got from the Edg assignment.
"How then do astronomers measure the distance of stars? The parallax, considered very accurate, is one method used by astronomers to measure the distances to nearby stars. The diameter of the earth’s orbit around the sun is about 300 million km. By observing a star one day and then again six months later, these scientists will be able to observe differences in the star the two times it was observed. Using trigonometry, these different angles yield the distance of how far away a star is."
A balloon has a negative charge and a glass rod has a positive charge.
Electromagnetic Forces Review: Mastery Assessment #3: INTEG SCIENCE 7-Jolley
What will happen when the glass rod is brought near the balloon?
plz help me 14 points
what are 5 reason masks are important for the virus
Answer:
they reduce viral transmission
They prevent asymptomatic spread
You're protecting others from illness.
They're mandated by law in some states
They're good hygiene in general
How many grams of carbon dioxide are produced when 2.05 moles of octane (C8H18)
combust?
2C3H18 (1) + 2502 (g) --> 16CO2 (g) + 18H20 (g) (balanced)
Did you ever get the answer
Which of the following actions decreases the entropy of a system?
A-mixing baking soda and salt
b- freezing water
c- dissolving salt in water
d-boiling water
Answer:
b- freezing water
Explanation:
Solid<liquid<gas is the general rule for entropy increase
Freezing water would change the phase from liquid to solid which would lead to less entropy
1. How many mg of lithium phosphide are in 18.0 mL of a 1.25 M solution?
Answer:
1160mg
Explanation:
Molarity = number of moles ÷ volume
According to the information in the question, molarity = 1.25 M, volume = 18.0 mL = 18/1000 = 0.018L
M = n/V
n = M × V
n = 1.25 × 0.018
n = 0.0225moles.
Using mole = mass/molar mass, to find the mass of lithium phosphide (Li3P)
Molar mass of Li3P = 6.9(3) + 31 = 51.7g/mol
mole = mass/molar mass
0.0225 = mass/51.7
mass = 1.16grams.
In milligrams (mg), mass of Li3P = 1.16 × 1000 = 1160mg
How much more acidic is 1 to 9
Answer:
Number one is the most acidic, the one in the middle is neutral, and number nine is alkaline.
Quicklime is an incredibly caustic substance that has been used during plagues to quickly dissolve diseased corpses. Calcium carbonate can be heated to produce quicklime (CaO) and carbon dioxide gas. What mass of quicklime could be produced from a 4,500g bag of calcium carbonate?
Answer:I just want points
Explanation:because I need them for future questions
Mr. Whiteman has two stock solutions of sulfuric acid (H2SO4) in the supply closet: 12.1 M and 6.0 M. If he wants to make 10.0 mL of a 1.0 M solution, which stock solution makes more sense to use? Justify with two calculations.
Answer:
12.1-M requires less volume of stock solution.
Explanation:
Hello there!
In this case, according to the foundations of dilution processes, it turns out convenient to remember that the moles of the solute before and after the dilution remains the same; for that reason we use the following equation:
[tex]M_1V_1=M_2V_2[/tex]
Relating the initial and final molarities and volumes. Now, it is seen that V2 is 10.0 mL and M2 is 1.0 M, which means that if we solve for V1 for 12.1 M and 6.0 M, we obtain the following volumes:
[tex]V_1=\frac{M_2V_2}{M_1} \\\\V_1^{12.1M}=\frac{1.0M*10.0 mL}{12.1M}=0.826mL\\\\V_1^{6.0M}=\frac{1.0M*10.0 mL}{6.0M}=1.67mL[/tex]
Therefore, since the 12.1-M solution requires less volume of stock solution, it makes sense to use this one as the initial solution.
Best regards!
Need help ASAP
Will mark BRAINLIST and thank you only for correct answers
Where would you have to be to see the view shown above? Explain.
how many protons are in phosphorous
Answer:
There are 15 protons in phosphorous.
~Hoped this helped~
~Brainiliest?~
please help me with this answer
Answer:
1) Hom DOMINANT
2) Hom recessive
3) Hetero DOMINANT
4) Hom DOMINANT
5) Hetero DOMINANT
6) Hom recessive
Explanation:
Even though the same amount of energy was transferred into both substances from the air, the isopropanol evaporated while the water did not. Why do you think the isopropanol changed phase, but the liquid water did not ... Earlier in the lesson, you observed isopropanol and water drops on a paper towel.HELP HELP PLS
Answer:
The isopropanol evaporated while the water did not because the molecules don't stick together as strongly as the molecules in the water do. The water would need more energy transferred in, in order to evaporate.
Explanation:
The isopropanol evaporates and the water does not because the heat capacity and the latent heat of isopropanol is far lesser than that of water.
The latent heat of vaporization is the amount of heat required by a given amount of substance to change its phase from liquid to gas. The latent heat of vaporization of isopropanol is far less than water, so at the same amount of heat, the isopropanol changes phase as it can easily evaporate even if a small amount of heat is provided. Whereas water requires to absorb a lot of heat energy to change its phase, since its latent heat of vaporization and specific heat capacity is very large as compared to isopropanol.
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A 0.239 gram sample of a gas in a 100-ml flask exerts a pressure of 603 mm Hg at 14 Celsius. What is the gas? (Hint: don’t forget BRINCLHOF)
A) chlorine
B) nitrogen
C) krypton
D) xenon
D) oxygen
Please help me and explain how u got ur answer
Answer:
A) chlorine
Explanation:
To solve this question we can use:
PV = nRT
In order to solve the moles of the gas. With the moles and the mass we can find the molar mass of the gas to have an idea of its identy:
PV = nRT
PV / RT = n
Where P is pressure: 603mmHg * (1atm / 760mmHg) = 0.7934atm
V = 100mL = 0.100L
R is gas constant = 0.082atmL/molK
T is absolute temperature = 14°C + 273.15 = 287.15K
0.7934atm*0.100L / 0.082atmL/molK*287.15K = n
3.37x10⁻³ moles of the gas
In 0.239g. The molar mass is:
0.239g / 3.37x10⁻³ moles = 70.9g/mol
The gas with this molar mass is Chlorine, Cl₂:
A) chlorineAmmonia (NH3 (g), Delta.Hf = –45.9 kJ/mol ) reacts with oxygen to produce nitrogen and water (H2 O(g), Delta.Hf = –241.8 kJ/mol) according to the equation below. 4 upper N upper H subscript 3 (g) plus 3 upper O subscript 2 (g) right arrow 2 upper N subscript 2 (g) plus 6 upper H subscript 2 upper O (g). What is the enthalpy of the reaction? Use Delta H r x n equals the sum of delta H f of all the products minus the sum of delta H f of all the reactants.. –3,572.1 kJ –1,267.2 kJ 1,267.2 kJ 3,572.1 kJ
Answer: –1,267.2 kJ
Explanation: B on edge, thank me later ;-)
–1,267.2 kJ is the enthalpy of the given reaction. Therefore, the correct option is option A among all the given options.
What is enthalpy?Enthalpy is a thermodynamic system's internal energy total as well as the volume times pressure ratio. Enthalpy is a property or state function that resembles energy; it has the same dimensions as energy and is therefore measured in joules or ergs. The value of enthalpy is solely dependent on the temperature, pressure, as well as composition of the system, not on its history.
The shift in the internal energy equals equivalent to the heat transmitted to, much less than the jobs completed by, the system, in accordance with the principle of energy conservation. The enthalpy change is precisely equal to the heat transmitted to the system if the sole work performed is a change in volume at constant pressure.
ΔH = ΔH for product - ΔH for reactant
= 3,572.1 kJ –1,267.2 kJ
= –1,267.2 kJ
Therefore, the correct option is option A.
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PLEASE ANSWER THESE QUESTIONS FOR 21 POINTS AND A BRAINLIEST, KEEP IN MIND THESE QUESTIONS ARE VERY IMPORTANT AND WILL DETERMINE MY GRADE!!!!(NO GUESSING, SPAMMING OR LINKS)
This is energy that is stored for later use.
kinetic energy
potential energy
mechanical energy
electromagnetic energy.
A ball rolling down the hill is an example of ___ energy.
1 point
Kinetic
Potential
Electrical
Sound
Requires two parents
1 point
Sexual reproduction
Asexual Reproduction
Small grains that contain a plant's male reproductive cells.
1 point
stamen
pollen
pistil
stigma
C, D , and E are collectively known as the ______.
1 point
Captionless Image
stamen
anther
sepal
pistil
Small leaf-like structures forming an outer circle at the base of a flower.
1 point
petals
sepal
stigma
pistil
The stalk that supports or holds up the anther is the
1 point
style
filament
ovary
pistil
A flower structure that encloses and protects ovules and seeds as they develop.
1 point
Petal
Ovule
Stigma
Ovary
the part of the ovary of seed plants that contains the female germ cell and after fertilization becomes the seed.
1 point
Ovule
Style
Stamen
.Pistil
Supports the stigma, serves as passageway for pollen
1 point
Anther
Style
Stem
Ovule
Renewable energy resources are?
1 point
A resource that cannot be readily replaced by natural means on a level equal to its use.
Invisible resources
Renewable resources that can be naturally restored.
All the above
Coal and oil are?
1 point
Non-Renewable energy resources
Renewable energy resources
None of the above
Bio-fuel and geothermal energy are examples of?
1 point
Non-renewable energy resources
Hydro energy
Renewable energy resources
None of the above
What is the name of flower part #10 ?
1 point
Captionless Image
sepal
pollen tube
filament
stigma
Which of the following is NOT a Natural Resource?
1 point
Coal
Paper
Solar
Wind
What is the disadvantage of using non-renewable resources?
1 point
They have a large carbon footprint.
They can all be used up over time.
They can lead to global warming.
All of these.
How many moles of mercury are equivalent to 3.46 x 1023 atoms?
Answer:
3.02 X1023 atoms Ag limol. - - 0.50 1 moles. 6.02241023 atoms.
ZnH2 + Cl2 → 2HCI + Zn
How many grams of Cla are needed to produce 6.2 moles of HCI?
O 868 grams Cl2
O 217 grams Cl2
O 434 grams Cl2
O 108.5 grams Cl2
Answer:
2 moles H
2
Explanation:
Your tool of choice here will be the mole ratio that exists between zinc metal,
Zn
, and hydrochloric acid,
:HCl
, in the balanced chemical equation.
Zn
(s]
+
2
HCl
(aq]
→
ZnCl
2(aq]
+
H
2(g]
↑
⏐
You're dealing with a single replacement reaction in which zinc displaces the hydrogen from hydrochloric acid. The products of the reaction are aqueous zinc chloride and hydrogen gas.
Now, as you can see from the balance chemical equation, a
1
:
2
mole ratio exists between the two reactants.
This tells you that in order for the reaction to take place, you need to have twice as many moles of hydrochloric acid as you do of zinc metal.
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http://people.springfield.k12.or.us/jim.tyser/chemcom/Resources/unit1ans.html
At the same time, you have a
2
:
1
mole ratio between hydrochloric acid and hydrogen gas.
This means that the reaction will always produce half as many moles of hydrogen gas as you have moles of hydrochloric acid.
Since you know that
4
moles of hydrochloric acid are taking part in the reaction, and assuming that you have enough zinc metal so that it doesn't act as a limiting reagent, you can say that the reaction will produce
4
moles HCl
⋅
1 mole H
2
2
moles HCl
=
2 moles H
2
Explanation:
Which advantage do multicellular organisms have over unicellule organisms
Answer:
Multicellular organisms thus have the competitive advantages of an increase in size without its limitations. They can have longer lifespans as they can continue living when individual cells die. Multicellularity also permits increasing complexity by allowing differentiation of cell types within one organism.
When the equation Al + Br2 → AlBr3 is balanced, the coefficient for Br2 isSingle choice.
Answer:
The answer should be 2 because to balance the equation you should have to change to equation to this; 2Al + 3Br2 => 2AlBr3, so that there is a total of 2 Aluminums and 6 Bromiums on either side of the equation.
Explanation:
In the given chemical equation, the coefficient of bromine is 2.
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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What causes Earth to orbit the sun ?
Answer:
gravity pulls on the earth and putts it in orbit around the sun
Explanation:
Is hc2h3o2 quadraprotic?
The _______ biome is the largest on Earth.
Explanation:
taiga the largest land well forest
The difference between sunspots solar flares and prominence
Answer:
Sunspots are cooler and darker than the rest of the Sun's surface. They are marked by intense magnetic activity. Solar prominences are the plasma loops that connect two sunspots. Solar flares and coronal mass ejections are eruptions of highly energetic particles from the Sun's surface.
Explanation:
Answer:
Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. They appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. They are extremely hot (10 to 20 million degrees Celsius) and extend into the corona. Solar flares occur near sunspots and can disturb radio communications on Earth.
Explanation:
Grants are money for education that students can use and not pay back. Of those listed, which one is an example of a grant.
A) AID
B) PELL
C) PLUS
D) Stafford and Perkins
Aid is money given to students for education funding which may not be paid back.
What is aid?The term aid may be used to refer to money given to a person for a particular purpose which the person may not be required to pay back. Often students are given this sort of assitance to fund their education.
Hence, grants given to students to finance their education which they may not pay back are called aid.
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