The complete combustion of acetic acid, HC2H3O2(I) to form water, H2O(I), and CO2(g), at constant pressure releases 871.7 kJ of heat per mol of acetic acid.
Write a balanced thermochemical equation if 5.0g of acetic acid will be used in the reaction.
HC2H3O2(I) + O2 --- H2O(I) + CO2(g) H= -871.7 kJ
Answer:
HC2H3O2(I) + O2(g) ---> H2O(I) + CO2(g) ΔH= -72.35 kJ
Explanation:
We know that 5.0 g of acetic acid will contain, 5.0g/60 g/mol = 0.083 moles of acetic acid
Now from the reaction equation;
1 mole of acetic acid evolved -871.7 KJ of heat
0.083 moles of acetic acid will evolve 0.083 * -871.7 = -72.35 KJ
For 5.0 g of acetic acid, we can write;
HC2H3O2(I) + O2(g) ---> H2O(I) + CO2(g) ΔH= -72.35 kJ
Plz help me with the electron dot structures! I’ll mark brainliest!
1) In the image below, determine the temperature in Fahrenheit.*
C 40
F
300
30
80
20
60
10
0
40
°F
Answer:
28.8889 or in simple terms 28.9 :) hope i helped
Explanation:
Answer:
28.8889 or in simple terms which I like to use is 28.9
Calculate the theoretical yield for your reaction. {This is your predicted mass of CuO produced based on the starting mass of CuCO3Cu(OH)2}
Identify the Experimental Yield of your reaction (the amount that actually got produced and measured)
Calculate the percent yield of your reaction (refer to the introduction)
Evaluate your percent yield – state at least one legitimate reason your yield could be higher or lower than 100%. Be specific (the experimental error is not specific enough, for example)
Answer:
CuCO3Cu(OH)2 overlapping yield calculate itCuCO3Cu(OH)2 overlapping yield calculate it
holy sheesh dude
Explanation:
CuCO3Cu(OH)2 overlapping yield calculate it
3. How many grams of oxygen are needed for the
complete combustion of 11 grams of propane, C3H8?
C3H8 + 5 O2 + 3 CO2 + 4 H2O
Answer:
Mass = 40 g
Explanation:
Given data:
Mass of oxygen needed = ?
Mass of propane = 11 g
Solution:
Chemical equation:
C₃H₈ +5O₂ → 3CO₂ + 4H₂O
Number of moles of propane:
Number of moles = mass/molar mass
Number of moles = 11 g/ 44.1 g/mol
Number of moles = 0.25 mol
now we will compare the moles of propane and oxygen.
C₃H₈ : O₂
1 : 5
0.25 : 5/1×0.25 = 1.25 mol
Mass of oxygen needed:
Mass = number of moles × molar mass
Mass = 1.25 mol × 32 g/mol
Mass = 40 g
What determines an element's properties?
ANSWER: A. The valence electrons
A. The valence electrons
B. The isotopes it forms
C. Its atomic mass
D. The core electrons
Answer:
b
Explanation:
Which best describes the effect of a ecosystem when populations of white-tailed deer are overhunted by people in an area?
A. It disrupts the balance between predators and prey
B. It decreases the amount of producers
C. It directly increases the population of decomposers
D. It decreases competition for food among carnivores
Answer:
A. It disrupts the balance between predators and prey
Explanation:
The effect on the ecosystem when populations of white - tailed deer are overhunted is that it disrupts the balance between predators and prey within the ecosystem.
The whited - tailed deer is the usually the prey. The carnivores are the cats and other flesh eating animals. When the deer is over-hunted, there are more predators compared to prey. This leads to a serious imbalance and a high level of competition for the scarce prey.
What is the trachea and where does it go?
Answer:
The trachea is a tube-like structure within the neck and upper chest. It transports air to and from the lungs when a person breathes. When a person inhales, air travels through the nose or mouth, down the trachea, and into the lungs.
Explanation:
Brainliest plz
How many gallons of water would be in a container that is 256 millimeters X 20 inches X.045 meter.
In the reaction Cu(s) + 2 AgNO3(aq) -> 2 Ag(s) + Cu(NO3)2(aq) how much Ag can be produced from 49.1 g of copper
Answer:167.9 g Ag
Explanation: 1 mol Cu + 2 mol AgNO3 = 2 mol Ag + 1 mol Cu(NO3)2
63.55 g Cu —> 2*107.688 g Ag
So 49.1 g Cu —> (49.1/63.55)*2*107.688 = 167.9 g Ag
The molecular weight of KMnO4 is 158 g/mol. If you wanted to make 500 mL of a 0.1M stock solution of KMnO4, how much solid KMnO4 would you need to add before filling mL flask of water?
Solid KMnO₄ needed = 7.9 g
Further explanationGiven
MW KMnO₄ = 158 g/mol
500 mL(0.5 L) of a 0.1M stock solution of KMnO₄
Required
solid KMnO₄
Solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
Input the value :
n = M x V
n = 0.1 M x 0.5 L
n = 0.05 mol
Mass KMnO₄ :
= mol x MW
= 0.05 x 158 g/mol
= 7.9 g
The solid KMnO₄ a person need to add before filling water flask will be:
"7.9 g".
Molecular weightAccording to the question,
Molecular weight of KMnO₄ = 158 g/mol
Volume of solution = 500 mL or,
= 0.5 L
Molarity = 0.1 M
We know the relation,
Molarity, M = [tex]\frac{n}{V}[/tex]
or,
→ n = M × V
By substituting the values,
= 0.1 × 0.5
= 0.05 mol
hence,
The mass of KMnO₄ will be:
= mol × Molecular weight
= 0.05 × 158
= 7.9 g
Thus the response above is appropriate.
Find out more information about molecular weight here:
https://brainly.com/question/24692474
Question 3
True or False. You must convert grams to moles to do stoichiometry.
True
оо
D
False
Answer:
True
Explanation:
Sometimes you will need to convert from grams to moles, or moles to grams
The table shows the recipe and the available ingredients for making the maximum possible number of sandwiches.
Making Sandwiches
Recipe for One Sandwich
Total Ingredients Available
1 cheese slice, 2 lettuce leaves, 2 bread slices Total ingredients available: 8 cheese slices, 6 lettuce leaves, 6 bread slices
If the ingredients represent reactants of a chemical reaction, which of the following represents the leftover reactant?
OTwo cheese slices
Two lettuce leaves
Five lettuce leaves
Five cheese slices
Answer:
5 Cheese Slices
Explanation:
I took the quiz and got it right.
Answer:
Five cheese slice
Explanation:
8-1-1-1=5
WHICH SIGN CAN SAY THAT A PHYSICAL CHANGE HAS TAKEN PLACE
1.FORMATION OF GAS
2.FORMATION OF PRECIPITATE
3.EVOLUTION OF HEAT
4.ALL THE ABOVE
Answer:
4. all of the above
Explanation:
that my answer hehehe..
What happens to the ice pack over time?
Answer:
it melts?
I don't really know but I have 60% that I think the answer is correct
what is the name and classification of a six sided molecule with oh attached
should i get this? i heard it smells good
Answer: Maybe not? Unless you care about namebrand, theres lots of dupes.
What human activities could increase erosion?
Check all that apply.
stripping the land of vegetation to build a mall
letting cattle overgrazing farmland
planting trees and shrubs
surrounding a corn field with a fence or shrubs
deforestation
plowing fields
I think it is the first one, the second one, and the fifth one. Hopefully helps :)
help plz and can you plz use terms
Substance X has a specific heat capacity that is twice as large as Substance Y. If both samples ended up at the same change in temperature from the same amount of energy added, what is the relationship between the masses of the two samples? Explain.
Answer:
Substance X has a smaller mass
Explanation:
The relationship between the mass of the two samples is that the mass of X is smaller compared to the mass of Y.
The specific heat capacity is given as:
C = [tex]\frac{H}{m x change in temperature}[/tex]
We can see that the higher the specific heat capacity the lesser the mass or simply put, the specific heat capacity of a body is inversely related to its mass.
If the amount of heat is constant i.e the same and the specific heat capacity of X is twice that of Y, then substance X has a smaller mass
LOOK AT THE PICTURE!! i’ll mark as brainliest!!
Answer:
c
Explanation:
The forces that hold molecules of metals together are stronger than the forces that hold molecules of non -metals together. This means that metals have
Answer:
Stronger bond as compared to non metals
Explanation:
Which statement best explains the net transfer of energy that is about to
happen in this photo?
A. The racket and the ball will both gain kinetic energy.
B. The ball will gain kinetic energy, and the racket will lose kinetic
energy
C. The racket will gain potential energy, and the ball will lose kinetic
energy
D. The racket and the ball will both lose potential energy
Answer:
Explanation:
B I got it right
Answer:
B. The ball will gain kinetic energy, and the racket will lose kinetic
energy
Explanation:
Radio waves are used to transmit information on various channels. What is the wavelength of a radio wave having the frequency of 5.40 × 1010 Hz?
1. Analyze the Problem
ν = and c = Unknown: λ =
You know that because radio waves are part of the electromagnetic spectrum, their speed, frequency, and wavelength are related by the formula c = λν.
Answer:
5.56×10¯³ m
Explanation:
From the question given above, the following data were obtained:
Frequency (v) = 5.4×10¹⁰ Hz
Wavelength (λ) =?
The velocity of electromagnetic wave, frequency and wavelength are related according to the equation:
Velocity (c) = wavelength (λ) × frequency (v)
c = λv
With the above formula, the wavelength of the radio wave can be obtained as follow:
Frequency (v) = 5.4×10¹⁰ Hz
Wavelength (λ) =?
Velocity (c) = 3×10⁸ m/s
c = λv
3×10⁸ = λ × 5.4×10¹⁰
Divide both side by 5.4×10¹⁰
λ = 3×10⁸ / 5.4×10¹⁰
λ = 5.56×10¯³ m
Thus, wavelength of the radio wave is 5.56×10¯³ m
which one would it be?
Answer:
1 chlorine and 2 hydrogen
Explanation:
because in the picture you already have a hint wichbis chlorine so that eliminiates C and D
and its 2 hydrogens because if it were 1 then there wouldn't be anything adding in the chemical equation
As the radius of a star increases, how do you think its mass might change?
Answer:
by wind
Explanation:
As the radius of the star increases, the mass will also increase.
This is all about the relationship between the radius and mass of stellar main sequence stars.
Now, usually they are expressed in solar units and as such as seen in the graph image attached, the relationship between the radius(R) and mass(M) of a main-sequence star is seen by the curve attached. It is clear that the higher the radius becomes, the larger the mass of the star also becomes.
To clarify this also, we have a mass - lumosity relationship formula where given as;
L = [tex]M^{3.5}[/tex]
Where;
M is mass
L is lumosity
We know from basics of stellar main sequence stars, that a larger radius gives a much brighter lumosity.
From the mass-lumosity formula, we see that Increase in lumosity is directly proportional to an increase in mass. Therefore in the same vein, we can say that increase in radius is directly proportional to an increase in mass.
read more at; brainly.com/question/20400571
Which technique helps you become more resoureful
Answer:
There is an abundance of technology to help students become more resourceful and productive. For example, mind mapping can help kids better understand problems and devise plans by visualizing connections, outlining different sides of issues, and determining next steps.
Explanation:
Why must ionic compound have a total charge of 0?
WILL GIVE BRAINLIEST!!
In the Andes Mountains, how does energy flow in an ecosystem that contains grasses and shrubs, pumas, and guanacos?
guanacos to grasses and shrubs to pumas
grasses and shrubs to guanacos to pumas
pumas to grasses and shrubs to guanacos
pumas to guanacos to grasses and shrubs
Answer:
I could be wrong but I am pretty positive that the correct order is grasses and shrubs to guanacos to pumas.
Compare and contrast ionic and molecular compounds.
Answer:
Ionic compounds consist of positive and negative ions bound together by electrical attraction. Molecular compounds are groups of atoms held together by covalent bonding, or the sharing of electrons..
Explanation: