Total heat required for all steps: Q1 + Q2 + Q3 + Q4 + Q5 = 309261 J.
How to calculate heat for the samples?
To calculate the amount of heat required to change the sample of water from ice at -45.0°C to liquid water at 75.0°C, we need to consider the heat required for the following steps:
Heat to bring the ice from -45.0°C to 0°C and melt itHeat to bring the liquid water from 0°C to 100°C and boil itHeat to bring the steam from 100°C to 75.0°CFor each of these steps, we can use the formula:Q = m × C × ΔT
where Q is the amount of heat required (in joules), m is the mass of the sample (in grams), C is the specific heat capacity (in joules/gram°C) and ΔT is the change in temperature (in °C).
Heat to bring the ice from -45.0°C to 0°C and melt it
To bring the ice from -45.0°C to 0°C, we need to add heat:
Q1 = m × Cice × ΔT1
where Cice is the specific heat capacity of ice (2.108 J/g°C), ΔT1 is the change in temperature (0°C - (-45.0°C) = 45.0°C).
Q1 = 100.0 g × 2.108 J/g°C × 45.0°C
Q1 = 9456 J
To melt the ice, we need to add heat:
Q2 = m × Lfus
where Lfus is the heat of fusion of water (333.55 J/g).
Q2 = 100.0 g × 333.55 J/g
Q2 = 33355 J
Total heat for step 1: Q1 + Q2 = 42711 J
Heat to bring the liquid water from 0°C to 100°C and boil it
To bring the liquid water from 0°C to 100°C, we need to add heat:
Q3 = m × Cwater × ΔT2
where Cwater is the specific heat capacity of liquid water (4.184 J/g°C), ΔT2 is the change in temperature (100°C - 0°C = 100°C).
Q3 = 100.0 g × 4.184 J/g°C × 100.0°C
Q3 = 41840 J
To boil the water, we need to add heat:
Q4 = m × Lvap
where Lvap is the heat of vaporization of water (2257 J/g).
Q4 = 100.0 g × 2257 J/g
Q4 = 225700 J
Total heat for step 2: Q3 + Q4 = 267540 J
Heat to bring the steam from 100°C to 75.0°C
To bring the steam from 100°C to 75.0°C, we need to remove heat:
Q5 = m × Csteam × ΔT3
where Csteam is the specific heat capacity of steam (1.996 J/g°C), ΔT3 is the change in temperature (75.0°C - 100.0°C = -25.0°C).
Q5 = 100.0 g × 1.996 J/g°C × (-25.0°C)
Q5 = -4990 J
Total heat for step 3: Q5 = -4990 J (since heat is being removed)
Total heat required for all steps: Q1 + Q2 + Q3 + Q4 + Q5 = 309261 J
To learn more about heat:
https://brainly.com/question/934320
#SPJ1
Answer:
q1 = ⇒ 9.42 kJ
q2 = ⇒ 226 kJ
q3 = ⇒ 31.4 kJ
qtot = ⇒ 267 kJ
Explanation:
I got it right edge 2023 <3
A beaker is known to contain 4.65x1024 molecules of sucrose, C12H22O11. How many cg of sucrose does the beaker hold?
According to the question, 1.6 x 1028 cg of sucrose does the beaker hold.
What is sucrose?
Sucrose is a type of sugar that is naturally present in many fruits and vegetables, and is also known as table sugar. It is composed of two simple sugars, glucose and fructose, and is the most common form of dietary sugar. It is used to sweeten many foods and beverages, and is also used in the food industry as a preservative. Sucrose is a disaccharide, which means that it is composed of two monosaccharides, or simple sugars, linked together.
The mass of a molecule of sucrose (C12H22O11) is 342.3 g/mol. Therefore, the number of cg of sucrose in the beaker is:
4.65 x 1024 molecules x 342.3 g/mol x 1 cg/10-2 g = 1.59 x 1028 cg
This can be further simplified to 1.6 x 1028 cg.
To learn more about sucrose
https://brainly.com/question/24655338
#SPJ1
The density of pure iron is 7.874 g/cm³. What is the mass (in grams) of a piece of iron with a volume of 20.00 cm³?
Answer:
157.48 g
Explanation:
To calculate the mass of a piece of iron with a volume of 20.00 cm³, we can use the formula:
mass = density x volume
where density is the density of pure iron (7.874 g/cm³) and volume is the volume of the iron piece (20.00 cm³).
mass = 7.874 g/cm³ x 20.00 cm³ = 157.48 g
So, the mass of the iron piece is 157.48 g.
How many liters would you need to make a 1 m solution if you have 6 mol of sodium hydroxide.
The liters would we need to make the 1 M solution if we have 6 mol of sodium hydroxide of 6 L.
The moles of the sodium hydroxide = 6 mol
The molarity of the sodium hydroxide = 1 M
The expression for the molarity is as follows :
The molarity = moles / volume in L
The volume of the sodium hydroxide = moles / molarity
The volume of the sodium hydroxide = 6 / 1
The volume of the sodium hydroxide = 6 L.
Thus the volume of the sodium hydroxide is 6L in the 1 M of the solution.
To learn more about moles here
https://brainly.com/question/1097767
#SPJ4
Anyone completed this?
Construct a device to regulate the release of energy
Types of Chemical Reactions
Project: Thermal Energy and Chemical Reactions
Instructions
Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your file(s) and are ready to upload your assignment, click the Add Files button below and select each file from your desktop or network folder. Upload each file separately.
Your work will not be submitted to your teacher until you click Submit.
Chemical reactions as well as thermal energy regulate release of energy. The steps are given below.
Reactions The water held at room temperature for 15 seconds before the activation, which involved smashing the pills, proving that the gadget regulated the activation. With the calcium chloride dissolving in the water, the temperature increased by 30° over the course of two minutes.Give a quart bag 5mL of water. Thermometer should be placed inside the bag to create contact. Two gelatin 000 capsules should each contain 1 gram of calcium chloride. the package with the capsules.If the capsules are submerged in water, wait 15 seconds before crushing them.-Temperature
0.00 seconds seventy five degrees
15 seconds; activation at 75 degrees
thirty second 86 degrees
One minute a temperature of 95
90 second at 104 degrees
For one minute 95 degrees
A reaction uses thermal energy from the source to produce a product.
For more information on types of chemical reactions kindly visit to
https://brainly.com/question/15000187
#SPJ1
How many moles of magnesium are produced when 11.2 moles of lithium react? Li(s)+MgCl 2 (aq)-->LiCl(aq)+Mg(s) (unbalanced)
According to the stoichiometry of the given chemical equation, 5.6 moles of magnesium are produced when 11.2 moles of lithium react.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given chemical equation, 2 moles of lithium gives 1 mole of magnesium , thus, 11.2 moles of lithium will yield 11.2×1/2=5.6 moles.
Thus, 5.6 moles of magnesium will be produced when 11.2 moles of lithium react.
Learn more about stoichiometry,here:
https://brainly.com/question/9743981
#SPJ9
true or false If an ice cube is in a glass of water at 0° and no thermal energy is added or removed then the ice cube and the water are in thermal equilibrium?
Answer:
True
Explanation:
When an ice cube is in a glass of water at 0°C and no thermal energy is added or removed, the ice cube and the water will reach thermal equilibrium. This means that the temperature of the system will remain constant and will not change over time. The ice cube will melt until it reaches the temperature of the water, which is 0°C, and the water will lose heat energy until it reaches the temperature of the ice cube, also 0°C. Once the temperatures of both the ice cube and the water are the same, the system is in thermal equilibrium.
Tell me if you kinda confuse :)
ALLEN
Answer:
Trur
Explanation:
An aqueous solution contains 5.0 % NaCl by mass.
Part A
Calculate the molality of the solution.
Part B
Calculate the mole fraction of the solution.
Molality of an aqueous solution of 5.0% NaCl will be 0.842 m. Mole fraction of NaCl is 0.014 and mole fraction of water is 0.98.
How do you calculate the molality of 5.0% NaCl solution?To calculate molality, we first calculate the mass of NaCl in the solution which is, 100 x 5/100% = 5g.
We then calculate the moles of NaCl in the solution,
5/58.45 = 0.08 (Molar mass of NaCl = 58.45)
Mass of water in the solution = 100g - 5g = 95g x 1/1000 = 0.095
Therefore, molality can now be calculated as,
Molality = 0.08/0.095 = 0.842 m.
How do you calculate the mole fraction of the solution?To calculate the mole fraction of the solution, we first calculate the moles of water in the solution,
Moles of water = 95/18 = 5.27 mol of water (Since molar mass of water = 18)
Now, mole fraction of NaCl = 0.08/5.27 + 0.08 = 0.014
Mole fraction of water = 5.27/5.27 + 0.08 = 0.098
To learn more about molality visit:
brainly.com/question/14591804
#SPJ1
To aid in the prevention of tooth decay, it is recommended that drinking water contain 1.00 ppm
fluoride, F−.
How many grams of F−
must be added to a cylindrical water reservoir having a diameter of 3.53×10^2 m
and a depth of 12.65 m?
mass:
g F−
How many grams of sodium fluoride, NaF, contain this amount of fluoride?
mass:
1 ppm of F- means 1 mg of F- in 1 L of water. The cylindrical water has a volume of 12.3 × 10⁸ L. Then, 12.38 × 10⁵ g of F- have to be added to the reservoir.
What is ppm concentration?PPM or parts per million is a term used to express the concentration of a substance. One ppm of a substance is its 1 mg in 1 L. Hence, 1 mg of F- is present in 1 L of water.
Volume of cylinder = π r² d
given that, diameter = 353 m
radius = 176.5 m
d= 12.65 m
v = 3.14 × (176.5)²×12.65 = 12.37× 10⁵ m³ = 12.37 × 10⁸ L.
1 L have 1 mg F-. Then, 12.37 × 10⁸ mg or 12.37 × 10⁵ g of F-.
Molar mass of NaF = 46 g/mol
46 g of NaF contains 19 g of F-. Then, mass of NaF that contains 12.37 × 10⁵ g of F- is:
12.37 × 10⁵ g × 46/19 = 2.97×10⁷ g.
Therefore, 2.97×10⁷ g of NaF contains 12.37 × 10⁵ g of F-.
Find more on ppm :
https://brainly.com/question/14598158
#SPJ9
Gas stoves and gas burners utilize methane gas (CH4) as a fuel. Its combustion reaction can be described by the following balanced chemical equation:
CH4 + 2 O2 → CO2 + 2 H2O
Cullen Airy is cooking a turkey for Thanksgiving dinner. He burns 2640 g of CH4 in the process. What mass of CO2 is produced during Cullen's turkey preparation?
in front of H2O for balance the hydrogen atoms: CH4 + O2 CO2 + 2H2O. A 2 can be placed Oxygen gas on the left to balance the oxygen atoms: CH4 + 2O2 Carbon dioxide + 2H2O. Now the equation balances.
Which balanced reaction was appropriate for methane combustion?The equation that balances is CH4(g)+2O2(g)CO2(g)+2H2O. (g) Methane (CH4) and oxygen (O2) combine during combustion to form carbon dioxide (CO2) and water (H2O): CO2 + 2 H2O CH4 + 2 O2 The laws of mass conservation is observed in this reaction because nothing was actually generated or destroyed, only rearranged.
What distinguishes a carbon molecule as primary, secondary, tertiary, or quaternary?According to the hierarchy of carbon atom attachments, primary carbon is only tied to one carbon atom, secondary carbon is only attachment to two carbon, tertiary carbon is only connected to carboxylic acid group, and quaternary chlorine is only linked to carbon rings.
To know more about hydrogen atoms visit :
https://brainly.com/question/1462347
#SPJ1
A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed
to be XBr, where X is the unknown metal. The scientist determined that a 4.742 g sample of this compound contains
4.877 x 10-2 mol Br. Calculate the atomic mass of the unknown metal, X.
atomic mass=
What is the identity of the metal? Provide the name or symbol of the element.
metal:
amu
Atomic mass of X is 813.022 g/mol and the element with an atomic mass closest to 813.022 g/mol is silver, Ag.
What is Atomic mass?
Atomic mass is the mass of an atom of a particular element, measured in atomic mass units (amu). It is equal to the sum of the number of protons and neutrons in the nucleus of an atom.
molar mass = (mass of Br) / (number of moles of Br)
molar mass = 4.742 g / (4.877 x 10-2 mol) = 974.74 g/mol
The molar mass of bromine is 80.904 g/mol, so the molar mass of the unknown metal X can be calculated as:
molar mass of X = molar mass of compound - molar mass of Br
molar mass of X = 974.74 g/mol - (3 * 80.904 g/mol) = 813.022 g/mol
The atomic mass of X can be calculated as the molar mass of X divided by the number of moles of X in the compound, which is 1:
atomic mass of X = molar mass of X / (number of moles of X)
atomic mass of X = 813.022 g/mol / 1 = 813.022 g/mol
Since the atomic mass of X is 813.022 g/mol, we can look up the element with that atomic mass in the periodic table. The element with an atomic mass closest to 813.022 g/mol is silver, Ag, with an atomic mass of 107.87 g/mol.
Therefore, Atomic mass of X is 813.022 g/mol and the element with an atomic mass closest to 813.022 g/mol is silver, Ag.
To learn more about Atomic mass from the link
https://brainly.com/question/17067547
#SPJ1
What a color symbolizes is a universal language.
Group of answer choices
True
False
Answer:
true
Explanation:
red is commonly seen as angry by anyone you ask
Answer:
True
Explanation:
Colors can have symbolic meanings that are recognized across cultures and societies. For example, red is often associated with passion and love, while green is associated with growth and prosperity. Blue is often associated with stability and reliability, while yellow is associated with happiness and optimism. These symbolic meanings of colors are a form of nonverbal communication that is widely understood, making them a universal language.
At which of the following distances do two 10.0 kg objects have the greatest 1 point gravitational attraction on each other? 1.4 m 15.6 m 22.1 km O 3,434 km
1.4 m should be the distance between two 10.0 kg objects to have greatest 1 gravitational attraction on each other. Therefore, the correct option is option A.
What is gravitational force?
Gravity represents one of nature's most powerful forces. Isaac Newton observed that this force constituted responsible for things falling to Earth while also keeping Earth around the Sun.
He even came up with a mathematical equation for it. His gravitational formula might very well explain the planets' orbits. It worked so well that it aided in the finding of Neptune several years ago. According to the gravity formula, force becomes inversely proportional to distance, hence the distance between the two objects should be as short as possible for maximum force 1.4 m is the correct distance.
Therefore, the correct option is option A.
To learn more about gravitational force, here:
https://brainly.com/question/24783651
#SPJ9
A reaction is occurring in a test tube. How is heat transmitted to the surroundings?.
Heat can be transmitted from a test tube to the surroundings by several different mechanisms, including conduction, convection, and radiation.
Conduction is the transfer of heat through a material, from a region of higher temperature to a region of lower temperature. In the case of a test tube, heat can be conducted through the glass walls and into the surrounding air or other materials that the test tube is in contact with.
Convection is the transfer of heat through the movement of fluids or gases. In the case of a test tube, as the contents of the test tube heat up, convection currents can be set up within the liquid or gas, which can transfer heat to the surrounding air or other materials.
Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. As the test tube and its contents heat up, they will emit some amount of infrared radiation, which can be absorbed by the surrounding air or other materials and contribute to the transfer of heat to the surroundings.
In general, the mechanism of heat transfer that dominates will depend on a variety of factors, such as the specific materials involved, the temperature difference between the test tube and the surroundings, and the rate of heating.
Learn more about heat transfer here:
https://brainly.com/question/13433948
#SPJ4
A toy top has a mass of 32. 0 g Cu. How many atoms Cu are in this spinning top, given that the average atomic mass of copper is 63. 55 g/mol Cu?
The spinning top has a total of 3.032 x 10^23 atoms of copper, which was calculated using its mass and the molar mass of copper.
To determine the number of atoms of copper in the spinning top, we first need to calculate the number of moles of copper present in the top using the given mass and molar mass of copper.
mass of copper = 32.0 g
molar mass of copper = 63.55 g/mol
Number of moles of copper = mass/molar mass
= 32.0 g/63.55 g/mol
= 0.5038 mol
Next, we can use Avogadro's number to convert the number of moles of copper to the number of atoms of copper:
1 mol of Cu = 6.022 x 10^23 atoms of Cu
0.5038 mol of Cu = 0.5038 mol x 6.022 x 10^23 atoms/mol
= 3.032 x 10^23 atoms
Therefore, there are 3.032 x 10^23 atoms of copper in the spinning top
To learn more about Avogadro's number Click here:
brainly.com/question/11580870
#SPJ4
What will happen to the portion of the molecule labeled C at the end of
the reaction when the product is released?
A. It will break down during the reaction process.
B. It will be scavenged by lysosomes and destroyed.
C. It will bind to another molecule of substrate.
D. It will be divided between the two products.
It will be scavenged by lysosomes and destroyed.
What is a lysosome?
Degradative organelles known as lysosomes serve as the cell's waste disposal system by breaking down old components found in the cytoplasm from both inside and outside the cell. Endocytosis is the process by which material from the outside of the cell is taken up; autophagy is the process by which material from within the cell is broken down.The organelles come in a wide range of sizes; the bigger ones might be up to ten times bigger than the smaller ones.Belgian researcher Christian de Duve, who later won the Nobel Prize in Physiology or Medicine in 1974, was responsible for their discovery and naming.More than 50 membrane proteins and more than 60 distinct enzymes have been found in lysosomes.To know more about lysosomes, click the link given below:
https://brainly.com/question/28202356
#SPJ1
What are the properties of noble gases and why are they so unreactive?
Answer:
because they have a full outer electron shell
Explanation:
Answer:
Noble gases are unreactive because they have a full outer electron shell, making them very stable and unlikely to participate in chemical reactions. They have low reactivity and are odorless, tasteless, and colorless gases.
Explanation:
With carbon dioxide, what phase change takes place when the temperature
decreases from -40°C to -80°C at 2 atm?
Carbon Dioxide Phase Diagram
K
Pressure (atm)
20-
15-
10-
10
5-
0
Melting
point
-100
Solid
-80
OA. A liquid changes to a solid.
B. A gas changes to a solid.
OC. A solid changes to a liquid.
OD. A gas changes to a liquid.
Boiling
point
Liquid
ㅎ
Gas
-20
.0
Temperature (°C)
20
With carbon dioxide, the phase change that takes place when the temperature decreases from -40°C to -80°C at 2 atm is Option B. A gas changes to a solid.
How does this occur?When the temperature decreases from -40°C to -80°C at 2 atm, the pressure and temperature of the carbon dioxide falls within the region in the phase diagram where the substance changes from a gas to a solid. This process is called deposition or sublimation.
Therefore, the correct answer is as given above. It could then be concluded that the phase change that takes place when the temperature decreases from -40°C to -80°C at 2 atm is Option B. A gas changes to a solid.
learn more about sublimation: https://brainly.com/question/20319173
#SPJ1
What isotopes are used to determine the age of ancient objects?
Answer:
Radioactive isotope carbon-14
Explanation:
Radiocarbon dating, also known as carbon-14 dating, is a method that is commonly used to determine the age of ancient objects. This method relies on the measurement of the radioactive isotope carbon-14. Carbon-14 is formed in the upper atmosphere by the interaction of cosmic rays with nitrogen-14 atoms. It then enters the food chain and is taken up by plants and animals. Upon death, the carbon-14 in the organism begins to decay, with a half-life of approximately 5,700 years. By measuring the amount of carbon-14 remaining in an ancient object, scientists can determine how long it has been since the object died and calculate its age.
Another method for determining the age of ancient objects is uranium-lead dating, which relies on the measurement of the isotopes uranium-238 and lead-206. This method is useful for determining the age of rocks and minerals, as well as for dating the age of the Earth itself.
Answer:
Radioactive isotope carbon-14
Explanation:
Blast furnaces give off many unpleasant and unhealthy gases. If the total gas pressure is 0.99 atm, the partial pressure of carbon dioxide is 5.065 kPa, and the partial pressure of hydrogen sulfide is 015.2 mmHg, what is the partial pressure, in atmospheres, of the remaining air?
___________ atm (2 sig figs)
The partial pressure of the remaining air is 0.94 atm.
Solving for the of the remaining air, we have:First, we'll convert the partial pressure of hydrogen sulfide from mmHg to kPa:
015.2 mmHg * (101.325 kPa / 760 mmHg)
= 0.020 kPa
Next, we'll find the sum of the partial pressures of carbon dioxide and hydrogen sulfide:
5.065 kPa + 0.020 kPa
= 5.085 kPa
Now we'll convert this sum to atmospheres:
5.085 kPa * (1 atm / 101.325 kPa)
= 0.05 atm
Finally, we'll subtract this sum from the total gas pressure to find the partial pressure of the remaining air:
0.99 atm - 0.05 atm
= 0.94 atm
So the partial pressure of the remaining air is 0.94 atm (to 2 sig figs).
Learn more about partial pressure on
https://brainly.com/question/14281129
#SPJ1
What is the maximum concentration of equimolar solutions of ferrous sulphate and sodium sulphide so that when mixed in equal volumes, there is no precipitation of iron sulphide? (For iron sulphide, Ksp=6.3×10−18).
Every solution should have an x mol/L maximum concentration. Each solution's concentration will be lowered to half, or x/2, after mixing.
∴[FeSO4] = [Na2S] = x/2M
Then, [Fe2+] = [FeSO4] = x/2M
Also, [S2−]=[NasS] = x/2M
Fe(S)(x) ↔ Fe 2 + (aq) + S2−(aq)
Ksp=[Fe2+][S2−]
6.3 × 10−18=(x/2)(x/2)
x2/4=6.3 × 10−18
⇒ x = 5.02 × 10−9
If the concentrations of both solutions are equal to or less than 5.02 × 10–9M, then there will be no precipitation of iron sulphide.
⇒x =5.02 × 10−9
Na2S and FeSO4 are combined in an equal volume. Maximum concentrations of both solutions are 22, 51109M, and 5. Since Ba(OH)2 is the strongest base of the available alternatives, its pH is highest. BaCl2 is a strong base because it is the salt of Ba (OH)2. BaCl2 hydrolysis produces the most alkaline solutions and raises the PH of all the salts provided in the inquiry.
Learn more about iron sulphide here:
https://brainly.com/question/19039025
#SPJ4
When you measure the solubility of a solute you must use the same ___ and type of solvent at given____
Answer:
It should be temperature, concentration
What are the differences between an endothermic and exothermic reaction?
Answer:
Exothermic-Producing heat
Endothermic-absorbing heat
Answer:
An endothermic reaction is a chemical reaction that absorbs heat energy, causing the temperature of the system to decrease. An exothermic reaction is a chemical reaction that releases heat energy, causing the temperature of the system to increase.
Explanation:
What is the new pressure if you expand 103.0 liters of air at 2.00 atm into a cylinder whose volume is 156.0 liters?
a
0.504 atm
b
2.33 atm
c
1.32 atm
d
3.03 atm
Answer:
Explanation:
The new pressure can be calculated using the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant (8.31 J/mol*K), and T is the temperature (assumed to be constant).
Since the number of moles of gas and temperature is constant, we can rearrange the equation to solve for the new pressure:
P = (NRT) / V
Using the initial conditions of P1 = 2.00 atm and V1 = 103.0 liters, we can find the new pressure P2 after the expansion to 156.0 liters:
P2 = (P1 * V1) / V2 = (2.00 atm * 103.0 liters) / 156.0 liters = 1.30 atm
Therefore, the new pressure is 1.30 atm, and the correct answer is (c) 1.32 atm.
8. Making soap is what type of reaction is it
Chemical
Physical
Phase change
all of the above
Answer:
chemical reaction
Explanation:
Answer:
Making soap can be considered a chemical reaction.
Explanation:
In the process of making soap, a reaction takes place between a fat or oil and an alkali, such as lye (sodium hydroxide), which results in the formation of soap molecules and glycerol. This reaction is known as saponification. The change in the composition of the reactants to form a new substance is a chemical change, not a physical change or a phase change.
What chemical is KOH? Calculate it's molar mass, showing your work
Answer:
56.11 g/mol
Explanation:
Answer:
56.105 g/mol
Explanation:
KOH is Potassium Hydroxide, a strong base commonly used in various industrial and laboratory applications.
The molar mass of KOH can be calculated by adding the atomic masses of its elements:
Potassium (K) - 39.098 g/mol
Oxygen (O) - 15.999 g/mol
Hydrogen (H) - 1.008 g/mol
So, the molar mass of KOH is:
39.098 g/mol + 15.999 g/mol + 1.008 g/mol = 56.105 g/mol
ALLEN
Which is NOT a limiting factor when it comes to applying motivation to employees in the hospitality industry?
A limiting factor when it comes to applying motivation to employees in the hospitality industry is Payment structure.
What is the structure?The structure of a essay is straightforward and simple.It typically consists of an introduction, two to three body paragraphs and a conclusion. The introduction should introduce the main topic and provide a brief overview of what will be discussed. The body paragraphs should provide more specific details about the main topic and should include supporting evidence. The conclusion should summarize the essay and provide a final thought or opinion. It is important to keep in mind that the essay should be free of plagiarism, so it is essential to write all content in one’s own words.
To learn more about structure
https://brainly.com/question/20300458
#SPJ1
Calculate the surface area in nm2 of a water solution contained in a Petri Dish with a diameter of 9.0 cm. The area of a circle is calculated as A = πr 2 .
The surface area of the water solution contained in a Petri dish with a diameter of 9.0 cm is approximately 6.36 × 10^16 nm^2.
What is area?In geometry, "area" is the measure of the size of a two-dimensional region or shape. It is usually measured in square units, such as square meters (m²) or square feet (ft²) and represents the amount of space that is enclosed by the boundary of the shape. The formula for calculating the area of a shape depends on its type. For example, the area of a rectangle is calculated by multiplying its length by its width, while the area of a circle is calculated by multiplying pi (approximately 3.14159) by the square of its radius. The concept of area is used in many fields, such as architecture, engineering, and physics, to determine the amount of material needed to construct or cover a surface.
According to question:
The surface area of the water solution contained in a Petri dish with a diameter of 9.0 cm can be calculated as follows:
1. First, we need to calculate the radius of the dish. The diameter is given as 9.0 cm, so the radius (r) is half of this value, which is:
r = 9.0 cm / 2 = 4.5 cm
2. Next, we need to convert the radius to nanometers (nm) since the surface area will be in nm^2. We know that 1 cm = 10,000,000 nm (1 cm = 10^7 nm), so we can convert the radius as follows:
r = 4.5 cm × 10,000,000 nm/cm = 45,000,000 nm
3. Finally, we can calculate the surface area of the water solution in the Petri dish using the formula for the area of a circle:
A = πr^2
A = π(45,000,000 nm)^2
A ≈ 6.36 × 10^16 nm^2
To learn more about the area visit:
brainly.com/question/25292087
#SPJ1
Which coefficients correctly balance the equation below
AI+CuSO - -> AI2(SO4)3+Cu
Answer:
Explanation:
In order to balance the equation, the coefficients in front of each element must be equal on both sides of the equation. Here's one way to balance the equation:
2 AI + 3 CuSO4 ---------------> 2 AI2(SO4)3 + 3 Cu
This means that for every 2 atoms of AI and 3 molecules of CuSO4, you'll get 2 molecules of AI2(SO4)3 and 3 atoms of Cu.
The reaction of H₂ with F2 produces HF with AH = -269 kJ/mol of HF. If the H-H and H-F bond energies are 432 and 565 kJ/mol,
respectively, what is the F-F bond energy?
H₂(g) +F₂ (g)—>2HF (g)
The F-F bond energy is 293 kJ/mol.
What is bond energy?Bond Energy also known as simply bond enthalpy, is described as a quantity that offers insight into the strength of a chemical bond.
ΔH = ∑(bond energies of bonds broken) - ∑(bond energies of bonds formed)
In this reaction above one H-H bond and one F-F bond are broken, and two H-F bonds are formed. Thus, the enthalpy change can be shown as:
ΔH = (1 × H-H bond energy) + (1 × F-F bond energy) - (2 × H-F bond energy)
Which gives us :
-269 kJ/mol = (1 × 432 kJ/mol) + (1 × F-F bond energy) - (2 × 565 kJ/mol)
Therefore, the F-F bond energy = [1 × (432 kJ/mol) + 2 × (565 kJ/mol)] - 269 kJ/mol = 293 kJ/mol
Learn more about bond energy at: https://brainly.com/question/14867588
#SPJ1
What are unusual qualities of water
Answer:
Water has several unusual properties that are important to life and the functioning of the earth's ecosystem. Some of these qualities include:
High Specific Heat: Water has a high specific heat, which means it requires a lot of heat energy to raise its temperature. This helps regulate the temperature of living organisms and the earth.
Cohesion and Adhesion: Water molecules stick to each other, creating surface tension. This property allows it to be drawn up through small tubes and to climb against gravity in plants.
Density Anomaly: Unlike most substances, water is less dense in its solid form than in its liquid form. This is why ice floats on water.
Polarity: Water is a polar molecule, meaning it has a positive and negative end. This polarity makes water an excellent solvent, capable of dissolving ionic and polar molecules.
High Heat of Vaporization: Water has a high heat of vaporization, which is the amount of heat energy required to convert liquid water into water vapor. This property makes water an effective coolant and helps regulate the earth's temperature.
Explanation:
