1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.
What mass of rock salt is required?The mass of rock salt required to lower the temperature of ice by 19 °C is determined using the Blagden's Law given below:
[tex]ΔT = iK_fm[/tex]where;
ΔT = Change in temperature in °Ci = van't Hoff factorKf = molal freezing point depression constantm = molality of the solute in mol solute/kg solvent.The van't hoff factor for NaCl, i = 2
Kf for water/ice = 1.86 °C kg/mol
molalityof NaCl = (mass/molar massl) / kg of ice
The mass of NaCl is derived as follows:
mass of NaCl = molality × mass of ice × molar massmolar mass of NaCl = 58.5
mass of ice = 3.78 kg
Let molality of NaCl = X
ΔT = 19 °C
Inputting the values above in the equation of Blagden law:
19 = 2 x 1.86 °C kg/mol x X
X = 5.11 mol/kg
Then, the mass of NaCl will be;
mass of NaCl = 5.11 × 3.78 × 58.5
mass of NaCl = 1129.9 g
Therefore, 1129.9 grams of rock salt, NaCl should be added to a 3.78 kg of ice to get the temperature to drop to -19 °C.
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Type of force when you open the door. *
1 point
A. applied force
B. friction
C. gravity
D. magnetism
A. applied force
force applied to an object
Answer:
A. Applied force
Explanation:
A. should be the answer because you applied force onto an object to make it move or do what you’d like.
I hope it helps! Have a great day!
Muffin~
Please answer.
A solar energy project is expected to have capital costs of $995,000, average yearly operating costs of $175,000, and a lifetime of 25 years. If the total production during the lifetime of the project is 89,500,000 kWh, what is the Levelized cost of energy (LCOE)?
a.$0.60 per kWh
b.$0.77 per kWh
c.$0.06 per kWh
d.$0.07 per kWh
Which of the following is a characteristic of Levelized cost of energy (LCOE)?
a. It is the minimum price per kWh at which electricity must be sold to break even over the lifetime of a power-generating project.
b. It is the maximum amount of power that can be produced per dollar over the lifetime of a power-generating project.
c. It is the maximum price per kWh at which electricity must be sold to break even over the lifetime of a power-generating project.
d. It is the minimum amount of power that can be produced per dollar over the lifetime of a power-generating project.
Which of the following statements is true for both solar energy and wind energy?
a. Energy is able to be collected both day and night.
b. Power from this energy source can easily be integrated into existing power grid systems.
c. Power generation using this energy source does not contribute to water pollution.
d. Energy collection equipment can be installed in agricultural areas without affecting crop production.
The Levelized Cost of Energy of the solar plant is $0.60 per kWh.
Solar energy and wind energy can both easily be integrated into existing power grid systems.
What is Levelized Cost of Energy?The Levelized Cost of Energy is a measure of the average net present cost of electricity generation for a generating plant over its lifetime.
The Levelized Cost of Energy of the solar energy product is calculated as follows:
Total cost over 25 years = 995,000, + $175,000 × 25 = $5,370,000
Total energy production over 25 years = 89,500,000 kWh
Levelized Cost of Energy = $5,370,000/89,500,000 kWh
Levelized Cost of Energy = $0.60 per kWh
The Levelized cost of energy (LCOE) is the minimum amount of power that can be produced per dollar over the lifetime of a power-generating project.
For solar energy and wind energy, power from both energy sources can easily be integrated into existing power grid systems.
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Answer:
one.
Which of the following statements is true for both solar energy and wind energy?
Power generation using this energy source does not contribute to water pollution.
2.
Which of the following is a characteristic of levelized cost of energy (LCOE)?
It is the minimum price per kWh at which electricity must be sold in order to break even over the lifetime of a power-generating project.
3.
A solar energy project is expected to have capital costs of $995,000, average yearly operating costs of $175,000, and a lifetime of 25 years. If the total production during the lifetime of the project is 89,500,000 kWh, what is the levelized cost of energy (LCOE)?
$0.06 per kWh
Explanation:
if you dont believe me thats all right i did it the answers are 200% you can check it for yourself
Since helium is lighter than air, it is difficult to measure the mass of a sample, so to find out the mass of helium in a birthday balloon, a student transferred the helium to a fixed 1. 50 l vessel at 25. 0 °c and found the pressure to be 3. 04 atm. What mass of helium is in the balloon in grams?.
A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.
What is an ideal gas?An ideal gas is that whose particles have negligible volume and intermolecular forces.
A 1.50 L vessel at 25.0 °C contains He at a pressure of 3.04 atm.
Step 1. Convert 25.0 °C to Kelvin.We will use the following expression.
K = °C + 273.15 = 25.0 + 273.15 = 298.2 K
Step 2. Calculate the moles of He.We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 3.04 atm × 1.50 L / (0.0821 atm.L/mol.K) × 298.2 K = 0.186 mol
Step 3. Calculate the mass of He.The molar mass of He is 4.00 g/mol.
0.186 mol × 4.00 g/mol = 0.744 g
A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.
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58.0 g of K2SO4 was dissolved in 500 g of water.
What is the molality of the solution? (Molar mass of
K2SO4 = 174.0 g/mol)
m
Round your answer to the nearest hundredth. Do not include units
in your answer.
Answer:
0.67
Explanation:
Molality is mols of solute over kilograms of solvent
there are 58/174 mols of solute, and 0.5 kg of solvent
(58/174)/0.5=0.6666...
Round to the nearest hundreth to get 0.67
just pick the right option
Answer:
A
Explanation:
As CO₂ (carbon dioxide) depends on the air temperature, it is the dependent variableTherefore, air temperature is the independent variableThis is about the relation between carbon dioxide and air temperature, so the soil surface is not a variable to be consideredWhich of these potential sources of water pollution is excluded from the clean water act
Answer:
C. Agricultural runoff
Explanation:
sorry if not helps if do im am sooooo happy
3. Classify each reaction as exothermic or endothermic. (4 marks)
a. Energy + SO2(g) S(g) + O2(g) _________________________________
b. Draw a potential energy diagram for the reaction above:
Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction owing to te fact that energy is a reactant in the equation.
What is an endothermic reaction?An endothermic reaction is one in wioch energy is supplied to the system in order to enable the breakdown of bonds. Hence, the reaction vessel feels cool as energy is withdrawn from the surroundings.
The reaction; Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction since energy is a reactant in the equation.
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What effect does sunlight have on CO2 molecules?
Answer:
CO2 molecules don't really interact with sunlight's wavelengths. Only after the Earth absorbs sunlight and reemits the energy as infrared waves can the CO2 and other greenhouse gases absorb the energy.
Explanation:
Mark me brainliest pls
Carbon dioxide molecules don't directly react with the sunlight but they can absorb the energy in the form of infrared waves when it is emitted after reflection through the Earth's surface.
What are infrared waves?Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).
[tex]CO_2[/tex] molecules don't really interact with sunlight's wavelengths. Only after the Earth absorbs sunlight and reemits the energy as infrared waves can the [tex]CO_2[/tex] and some other greenhouse gases absorb the energy.
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In order to make a covalent bond, the orbitals on each atom in the bond must overlap.
Answer:
true
Explanation:
Covalent bonds are formed through the overlap of half-filled valence orbitals. Because of the overlapping, it is most probable that electrons are located within the region of the bond.
In order to make a covalent bond, the orbitals on each atom in the bond must overlap. Therefore, the given statement is true.
What is covalent bond?A covalent bond is an electron exchange usually results in the production of electron pairs between atoms. These electron couples are referred to as bonding pairs as well as sharing pairs. Covalent bonding seems to be the permanent equilibrium of atoms' forces of attraction versus attraction when atoms share electrons.
Because to electron sharing, each atom in a number of molecules can achieve the corresponding amount of the valence shell, resulting inside a stable electronic configuration. In organic chemistry, covalent bonds are far more common than ionic ones. In order to make a covalent bond, the orbitals on each atom in the bond must overlap.
Therefore, the given statement is true.
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Time (sec) [CH4] (mol/L)
0 1.2
20 1.0
40 0.9
60 .85
CH4 (g) + O2 (g) -----> CO2 (g) + H2O (l)
Given the above table and equation above, calculate the average rate of consumption of oxygen from time 20 seconds to time 60 seconds.
Based on the table and the equation of reaction; the
rate of consumption of oxygen between time 20 and 40s is 0.005 M/srate of consumption of oxygen between time 40 and 60s is 0.0025 M/sWhat is rate of a reaction?The rate of a reaction is the rate at which reactants molecules are consumed or products are formed.
Rate of reaction = change in concentration of reactants or products/ time takenBased on the equation of reaction, the rate of consumption of oxygen is equal to the rate of consumption of methane.
Thus. rate of consumption of oxygen from time 20 seconds to time 60 seconds is calculated as follows:
Rate between 20 and 40 = 1.0 - 0.9/20
Rate of consumption of oxygen = 0.005 M/sRate between 40 and 60 = 0.9 - 0.85/20
Rate of consumption of oxygen = 0.0025 M/sTherefore, the rate of consumption of oxygen decreases with time.
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What does net force depend on
Answer:
net force depends upon the object and also the mass of that object
Answer:The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.
Explanation:
free brainiest to whoever writes me the best love note! :) <3 dont miss the opportunity!!!
Answer:
Hi! I hope you're having a wonderful day, if not, I hope it gets better, much love and kindness! Be great!
1. Describe what the following terms mean
Temperature -
Heat -
Exothermic -
Endothermic -
Jin listed some common thermal insulators and conductors in a chart. (attached below)
Which belongs in the area marked with an X?
A.) Iron
B.) Foam
C.) Wood
D.) Glass
Have a great rest of your day
#TheWizzer
Answer:
I would have to say the answer is A) iron. I say this because Iron is one of the most well know conductors and in the chart it as rubber and copper as the two conductors whole Air and Iron should be the x. Plus the rest don't make good conductors they are more insulators. So logicaly it wouldn't make sense to have any of the other answers.
Explanation:
Hope This Helps
Have A Great Day
~Zero~
According to the concept of conduction, iron belongs in the area marked with an X.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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ANSWER FAST PLS ILL GIVE BRAINLY 5. What are animals called that make their homes underground?
grazers
reptiles
burrowers
meat-eaters
Answer:
burrowers
Explanation:
What is a DNA fingerprint and why is it considered individual evidence?
Answer:
DNA fingerprinting is a laboratory technique used to establish a link between biological evidence and a suspect in a criminal investigation.
A DNA sample taken from a crime scene is compared with a DNA sample from a suspect. If the two DNA profiles are a match, then the evidence came from that suspect.
During winter in cold climates, salt is often used on roads to prevent the buildup of slippery ice. Although salt may make driving safer, it can cause the metallic parts of cars to corrode or rust relatively quickly. In a few sentences, please explain what is occurring.
Answer:
this is because the salt may be acidic and also may have oxygen substituent which can lead to rust
During cold winters, the salt present on the roads reacts with the iron and the dew water and results in the formation of the iron oxide as rust.
What is rust?The rust has been given as the iron oxide compound, that has been formed with the reaction of the water with the iron in the presence of oxygen.
In the winters, there has been the presence of the water in the salt, and the interaction of the salt with the iron to form the iron oxide that is rust.
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what is density/ how does density work
help help
Answer:
Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.
Explanation:
Answer:
The mass per unit volume of a substance is called density of that substance.
Explanation:
So, How does it works ?
For example: Density of gold is 19300kg/cubic meter. It means that if there gold having volume of a cubic meter its mass will be 19300 kg... Density of plastics are less than that of density of metals... I.e. if we take plastic having volume 2 cubic meter & gold having volume 1 cubic meter we will find mass of gold is far more compared to that of plastic.. Thus, density refers how much tightly the molecules of a substance are bonded together.
If you want to produce 18.48 grams of NaCl what is the minimum amount of each reactant that you must start with
The minimum amount of NaOH and HCl that must be present to produce 18.48grams of NaCl is 12.6g and 11.5g respectively.
Calculation of amount of reactantsThe balanced neutralization reaction equation for the formation of NaCl is,
NaOH + HCl ---> NaCl + H2
The molar mass of NaOH = 23+16+1 = 40g/mol
The molar mass of NaCl = 23 +35.5 = 58.5g/mol
If 40g of NaOH = 58.5g of NaCl
∴ x g of NaOH = 18.48g of NaCl
Make xg the subject of formula,
x g of NaOH = 40 × 18.48/58.5
= 739.2/58.5
= 12.6g of NaOH
The molar mass of HCl = 1 +35.5 = 36.5g/mol
If 36.5g of HCl= 58.5g of NaCl
∴ x g of HCl = 18.48g of NaCl
Make xg the subject of formula,
x g of HCl = 36.5 × 18.48/58.5
= 674.52/58.5
= 11.5g of HCl
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A sealed flask contains 3.82 x 1024 molecules of CO, How many moles of Co, are in the flask?
Answer:
if you meant 3.82* 10^24, the answer is 6.34551495 moles
if you meant 3.28*1024, the answer is 6.49780731*10^-21 moles
since you're going from molecules to moles, you need to divide by Avogadro's number which is 6.02*10^23
all in a day's work cryptogram
Answer:
yup!
Explanation:
i dont know what else to say.
When the maturities of a bond issue are spread over several dates, the bonds are called.
What is the molarity of a solution consisting of 105 grams of calcium nitrate and 280. grams of water?
Answer:
About 2.29 M.
Explanation:
Recall that molarity is defined by moles of solute over liters of solution.
Our solute is 105 grams of calcium nitrate (Ca(NO₃)₂)).
Convert 105 grams of Ca(NO₃)₂ to moles. The molecular weight of Ca(NO₃)₂ is 164.10 g/mol:
[tex]\displaystyle 105\text{ g Ca(NO$_3$)$_2$}\cdot \frac{1\text{ mol Ca(NO$_3$)$_2$}}{164.10\text{ g Ca(NO$_3$)$_2$}} = 0.640\text{ mol Ca(NO$_3$)$_2$}}[/tex]
Convert 280. grams of water to liters. Recall that the density of water is given by 1.00 g/mL:
[tex]\displaystyle \begin{aligned} D & = \frac{m}{V} \\ \\ V & = \frac{m}{D} \\ \\ & = \frac{(280.\text{ g})}{\left(\dfrac{1.00\text{ g}}{1\text{ mL}}\right)} \\ \\ & = 280. \text{ mL}\cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.280\text{ L soln.}\end{aligned}[/tex]
Hence, the molarity of the solution is:
[tex]\displaystyle \begin{aligned} \text{M} &= \frac{\text{ mols solute}}{\text{L soln.}} \\ \\ & = \frac{(0.640\text{ mol})}{(0.280\text{ L soln.})} \\ \\ & = 2.29\text{ M} \end{aligned}[/tex]
In conclusion, the solution is about 2.29 M.
The mass and distance between two objects affects the strength of gravitational force.
What factors do you think might affect the strength of the electric force?
9. In a neutralization reaction, an acid and a base react to produce a an oxide and water.
true/false
Answer and Explanation: The answer is false.
Select the correct answer from the drop-down menu. a scientist digs up sample of arctic ice that is 458,000 years old. he takes it to his lab and finds that it contains 1.675 grams of krypton-81. if the half-life of krypton-81 is 229,000 years, how much krypton-81 was present when the ice first formed? use the formula n = n0 . the ice originally contained grams of krypton 81.
The original mass of krypton 81 that is present in the ice is 6.70 grams.
How do we calculate original mass?Original mass of any substance will be calculated as below for the decomposition reaction is:
N = N₀(1/2)ⁿ, where
N = remaining mass of krypton-81 = 1.675g
N₀ = original mass of krypton-81 = ?
n will be calculated as:
n = T/t, where
T = total time period = 458,000 years
t = half life time = 229,000 years
n = 458,000/229,000 = 2
Now putting all these values on the above equation, we get
N₀ = 1.675 / (1/2)²
N₀ = 6.70 g
Hence required mass is 6.70 g.
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Water’s molar mass is 18.01 g/mol. the molar mass of glycerol is 92.09 g/mol. at 25°c, glycerol is more viscous than water. which substance has the stronger intermolecular attraction? glycerol because it has a larger molar mass glycerol because it is more viscous and has a larger molar mass water because it has a lower molar mass water because it is less viscous and has a lower molar mass
Glycerol has the stronger intermolecular attraction because it is more viscous and has a larger molar mass.
What is Viscosity?This is the ability of substances to resist flow and is common among fluids such as air and liquid.
Glycerol however has a stronger intermolecular attraction because it is more viscous and has a larger molar mass because they have a direct relationship.
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Answer:
A-glycerol because it has a larger molar mass
Explanation:
Edge 2022 :)
The balanced equation for the aerobic reaction is:
Zn + 2 HCl → ZnCl2 + H2
How much hydrogen gas is produced from 5 g of HCl?
Answer:
1.85 g of hydrogen gas will form!
Explanation:
1. Write the balanced equation.
Zn
+
2HCl
→
ZnCl
2
+
H
2
2. Calculate the moles of
Zn
.
Moles of Zn
=
30.0
g Zn
×
1 mol Zn
65.38
g Zn
=
0.4589 mol Zn
3. Calculate the moles of
H
2
.
Moles of H
2
=
0.4589
mol Zn
×
2 mol H
2
1
mol Zn
=
0.9177 mol H
2
4. Calculate the mass of
H
2
.
Mass of H
2
=
0.9177
mol H
2
×
2.016 g H
2
1
mol H
2
=
1.85 g H
2
How many liter are in 55.5 grams of neon?
What can you infer about magnetic domains from the fact that they are arrangements of atoms?.
Explanation:
Q. What can you infer about magnetic domains from the fact that they are arrangements of atoms? The individual domains are extremely small.
In ferromagnetic materials, smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. That's why you can magnetize them.An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.