Answer:
[tex]c=3.71\ J/g^{\circ} C[/tex]
Explanation:
Given that,
Mass of sample, m = 996.9 g
The change in temperature of the sample, [tex]\Delta T=-70.98^{\circ}C[/tex]
Heat produced, Q = 62.9 calories = 263173.6 J
The heat released by a sample due to change in temperature is given by :
[tex]Q=mc\Delta T[/tex]
Where
c is the specific heat capacity
So,
[tex]c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{263173.6}{996.9\times 70.98}\\\\c=3.71\ J/g^{\circ} C[/tex]
So, the specific heat of ethanol is equal to [tex]3.71\ J/g^{\circ} C[/tex].
A student determines that the theoretical yield of CaCO3 from a precipitation reaction is 21.5 grams. However, this student only recovers 19.9 grams of precipitate through filtration of the solution. What would be this student’s percent yield?
Answer:
Explanation:
jn
The student’s percent yield is 92.55 % where theoretical yield is 21.5 grams.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .Percent yield is calculated as per formula, 19.9/21.5×100=92.55%.
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Determine the mass in grams of Avogadro's number of C12H22O11
Answer:
2.059524x10^26 if im not wrong
Explanation:
avogadro's number is 6.022x10^23
What is one type of weather you hate because it ruins your plans ?
This is just a question jsut answer and to the first person I will give brainlist
Answer: rain
Explanation:
Why are young plants like but not identical to their parents?
Answer:
Dna
Explanation:
You're welcome
Arriving back from school, you decide to microwave a Hot Pocket for a snack. You have a
1500W microwave that took 3 minutes to cook the Hot Pocket.
Answer:
Kristy thank you doing today hope you doing recently
Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.
What is Microwave?There are several uses for microwaves, including for communications, radar, and—possibly for the most part—cooking. Waves or particles of electromagnetic radiation with various wavelengths and frequencies are communicated.
The electromagnetic spectrum (EM spectrum) is the name given to this wide spread of frequencies. In general, the spectrum is divided into seven areas in ascending sequence of increasing energy and frequency and decreasing wavelength.
Radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays, and gamma-rays are some of the common names for these types of energy. In the electromagnetic (EM) spectrum, microwaves are found between radio and infrared light.
Therefore, Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.
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When the heat wave passes and temperatures
become mild, electrical demand decreases. What
needs to be done to reduce electricity output in
response to this decreased demand?
the answer: lowering the control rods
Answer:
lowering the control rods
Explanation:
determine the number of moles and mass of the sample of argon occupying 37.8L at STP
Answer:
The number of moles and mass of the sample of argon occupying 37.8L at STP are 1.6875 moles and 67.41 grams respectively.
Explanation:
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Then you can apply the following rule of three: if by definition of STP 22.4 L are occupied by 1 mole of Ar, 37.8 L of Ar are occupied by how many moles?
[tex]amount of moles=\frac{37.8 L* 1 mole}{22.4 L}[/tex]
amount of moles= 1.6875 moles
The atomic weight of Ar is 39.948 g/mol. So the mass of the sample of argon can be calculated as:
1.6875 moles* 39.948 [tex]\frac{g}{mol}[/tex] = 67.41 grams
The number of moles and mass of the sample of argon occupying 37.8L at STP are 1.6875 moles and 67.41 grams respectively.
Consider the Hertzsprung Russell diagram seen here. We can use this diagram to classify stars and determine their characteristics.
The color of a star is determined by its temperature: the hottest stars are blue and the coolest are red. The Sun has a surface
temperature of 5,500°C and it appears yellow. The diagram also indicates that temperature coincides with luminosity: the hotter the
star, the higher the luminosity. You can also tell the size of each star from the graph as the larger the radius, the higher the
temperature and luminosity. Regardless of a star's position in the diagram, the energy that results in high temperatures and the stars
luminosity is generated by what process?
W
A)
nuclear fusion
B)
nuclear fission
gravitational forces of swirling gases
D)
friction generated by gravitational force
Answer:
Explanation:
A- nuclear fusion
PLEASE HELP ASAP!!
57. Sodium sulfate is used in the manufacture of detergents.
a. Identify each of the component elements of sodium sulfate, and write the compound's chemical formula.
b. Identify the compound as ionic or covalent.
c. Calculate the percent by mass of each element in sodium sulfate.
Answer:
See Explanation
Explanation:
The formula of sodium sulphate is Na2SO4. The component atoms in the compound are; sodium, sulphur and oxygen.
The compound is ionic. it is composed of sodium ions and sulphate ions.
The molar mass of sodium sulphate = 142 g/mol
percentage by mass of sodium = 2* 23/142 * 100 = 32.39 %
percentage by mass of sulphur = 32/142 * 100 = 22.5%
percentage by mass of oxygen = 4 * 16/142 * 100 = 45.1 %
What is the molarity of a solution prepared by dissolving 10.0 grams of NaOH in enough water to make a solution with a total volume of 2.40 liters?
O0.104 M NaOH
O0.201 M NaOH
O0.361 M NaOH
O0.412 M NaOH
Solution :
Molecular mass of NaOH is 23 g/mol .
So, number of moles of NaOH is given by :
[tex]n = \dfrac{10}{40}\ mole[/tex]
Now, we know molarity is given by :
[tex]Molarity = \dfrac{Number \ of \ moles\ of \ salute}{Volume ( in \ Liter ) }[/tex]
[tex]M = \dfrac{10}{40\times 2.4} \ M\\\\M = 0.104 \ M[/tex]
Hence, this is the required solution.
Answer: The answer is A O0.104 M NaOH
Explanation:
Which is true?
A. Elements are always metals.
B. Elements are always solids.
C. Elements can be broken down into other substances.
D. Each element will react in its own way with other elements.
Answer: I think it's D
Explanation: None of the other options are true.
Es un cambio natural o provocado, donde se produce energía para agua y dióxido de carbono: a)Precipitación. b)Fermentación c) Efervecencia. d) Combustión.
Answer:
d) Combustión.
Explanation:
¡Hola!
En este caso, dado que estamos enfocados en el concepto de cambio químico, el cual se caracteriza por exhibir un cambio en la composición e identidad de las sustancias iniciales (reactivos) a otras finales (productos).
Ahora bien, como se nos dice que los productos de este cambio químico son energía, agua y dióxido de carbono, inferimos que el nombre de este proceso es d) Combustión, por ejemplo la combustion del gas natural para calentar nuestras comidas en la cocina.
¡Saludos!
A day on Earth is about 24 hours.
What does 24 hours represent?
O A. the time it takes the Moon to orbit Earth once
B. the time it takes Earth to spin once on its axis
O c. the time it takes the Sun to travel once around Earth
D. the time it takes Earth to travel once around the Sun
What is the name of NaC2H3O2?
The chemical name for NaC₂H₃O₂ is sodium acetate.
Sodium acetate is a compound that consists of sodium ions (Na+) and acetate ions. It is also known by its chemical formula CH₃COONa. The compound is commonly found in both solid and aqueous forms.
Sodium acetate is produced by the neutralization reaction between acetic acid and sodium hydroxide. It can also be obtained by reacting sodium carbonate with acetic acid. The resulting product is a white crystalline solid that is highly soluble in water.
One of the notable properties of sodium acetate is its ability to act as a buffer solution, meaning it can resist changes in pH. It is often used in various applications.
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the distance between two points on a map is 0.04 kilometers what is the distance in meters
(52.6 cm)(1.214cm) what is the product expressed to the correct number of significant figures?
In the Reaction: Pb(NO3)2 + 2 Kl —> Pbl2 + 2 KNO3
How many grams of lead (II) iodide, Pbl2, is produced from 82.7 grams of potassium iodide, KI?
Round to two decimal places.
Answer:
114.8g PbI2 are produced
Explanation:
To solve this question we must convert the mass of KI to moles using its molar mass (KI = 166.0g/mol). As 2 moles of KI produce 1 mole of PbI2 we can find its moles and its mass (Molar mass PbI2: 461.01g/mol) as follows:
Moles KI:
82.7g KI * (1mol / 166.0g) = 0.498 moles KI
Moles PbI2:
0.498 moles KI * (1mol PbI2 / 2mol KI) = 0.249 moles PbI2
Mass PbI2:
0.249moles * (461.01g/mol) =
114.8g PbI2 are producedi need the answer ASAP
in the electromagnetic spectrum
Fact: wavelength range: 1cm to 1m
-radio wave
-microwave
-infrared waves
-visible light
-ultraviolet rays
-X-rays
-Gamma-rays
-cosmic rays
Answer:
Visible light
Explanation:
As mentioned in the first section of Lesson 2, our eyes are sensitive to a very narrow band of frequencies within the enormous range of frequencies of the electromagnetic spectrum. This narrow band of frequencies is referred to as the visible light spectrum. Visible light - that which is detectable by the human eye - consists of wavelengths ranging from approximately 780 nanometer (7.80 x 10-7 m) down to 390 nanometer (3.90 x 10-7 m). Specific wavelengths within the spectrum correspond to a specific color based upon how humans typically perceive light of that wavelength. The long wavelength end of the spectrum corresponds to light that is perceived by humans to be red and the short wavelength end of the spectrum corresponds to light that is perceived to be violet. Other colors within the spectrum include orange, yellow, green and blue.
how many grams of copper do you have if you have 2.00 moles of copper
Answer:
We assume you are converting between moles Copper and gram. You can view more details on each measurement unit: molecular weight of Copper or grams.
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The equation below represents the main ingredients a vendor uses to make the double cheeseburgers he sells.
1 bun + 2 hamburger patties + 2 slices of cheese à 1 double cheeseburger
The double cheeseburgers sell for $2 each. The vendor has 1326 buns, 2624 hamburger patties and 2004 slices of cheese. How much money will the vendor make selling the double cheeseburgers
Answer:______ dollars
Answer:
1326
2624÷2=1312
2004÷2=1002
1002*2=$2004
Explanation:
2004 dollars
Answer:
.-.
Explanation:
The author wanted to revise this story to allow readers to understand more fully how Coach Wilkins felt about the banquet and his career. What change would be MOST effective? Include the point of view of the coach by adding his thoughts and dialogue. A) Remove all the details about Josh, the cafeteria workers, and Principal Edwards B) Include more information on the activities with which Coach Wilkins was involved. Change the details to have Coach Wilkins deciding to teach social studies and coach footbalL D) y Comprehension
Answer:D
Explanation:i did the usa test prep
Answer:answer is D
Explanation:
Consider the following equilibrium: 2 NO2(g) ⇌ N2O4(g) + Energy The equilibrium will shift to left as a result of... — BRAINLIEST will be rewarded to the first to answer with the correct answer.
Answer:
C.
Explanation:
The left side has 2 mols of gas and the right only has 1. Thus increasing volume (decreasing pressure) would shift the reaction to the left
In three molecules O2, HCI, and F2, what atom would have a partial negative charge, setting up a dipole moment?
A) oxygen
B) hydrogen
C) chlorine
Answer: a.Oxygen
Explanation:
Phytoplankton are a diverse group of unicellular organisms that are neither plants nor animals. Phytoplankton use sunlight, carbon dioxide, and nutrients to live and grow. Do you think phytoplankton are producers, consumers, or decomposers? Explain your reasoning.
Answer:
They are producers
Explanation:
Phytoplankton are producers and this is because they synthesis their own food and produce energy. They photosynthesized and convert carbondioxide and water in the presence of light energy and chlorophyll to carbohydrates and oxygen. They are producers because they produce their own food.
2. Given the following balanced chemical equation: 3ZnO + 2Li3N
-->
Zn3N2 + 3Li20
If 3.14 g of ZnO reacts with 3.14 g of Li3N,
a. Identify the limiting reactant.
b. Identify the reactant in excess.
c. How many grams of Zn3N2 are formed?
d. How many grams of the excess reactant are needed for the reaction?
e. How many grams of the excess reactant are left at the end of the reaction?
Answer: For question, C. 224.1534
Explanation:
1 mole is equal to 1 moles Zn3N2, or 224.1534 grams.
Calculate the average reading for all three trials for both the wet bulb and dry bulb thermometers. Convert the average
temperatures for both thermometers to Celsius using this formula:
(°F - 32) = °C.
Answer: °32= 0 °C.
Explanation:
Answer:
Explanation:
Please add the temperature readings from all three trials for both thermometers. Will do the calculation with readings.
can engineered food affect the environment? why? or why not?
Have GM crops caused damage to the environment? Crops do not damage the environment simply because they are GM. Some farming practices, such as the overuse of herbicides resulting in the excessive eradication of wild plants from farmland have been shown to harm the environment.
Some benefits of genetic engineering in agriculture are increased crop yields, reduced costs for food or drug production, reduced need for pesticides, enhanced nutrient composition and food quality, resistance to pests and disease, greater food security, and medical benefits to the world's growing population.
Answer:
Yes
Explanation:
Food that comes from the engineering food factories wrapped in plastic which can be dangerous for the environment.
Help ASAP brainly if you get it right for me please …
Answer:
Explanation:
The answer would be d
2) Which one is not an ionic compound?
a) LiCl
b) MgBr 2
c) CaO
d) HCl
Answer:
A
Explanation:
LiCl is an ionic compound because Li is a metal (all elements in the first 2 rows are metals) and chlorine is a non-metal.
What can be concluded about the purpose many robots will have in the future