Answer:
305 mg
Explanation:
The equation of the reaction is;
C9H8O4 + NaOH = C9H7O4Na + H2O
Amount of NaOH reacted = 15.5/1000 L * 0.109 M = 1.69 * 10^-3 moles
Since the reaction has a 1:1 mole ration, 1.69 * 10^-3 moles of acetylsalicylic acid reacted.
Assuming all the acetylsalicylic acid reacted, then mass of acetylsalicylic acid present = 1.69 * 10^-3 moles * 180.158 g/mol = 0.305 g or 305 mg
The barometer at an indoor pool reads 105.00 kPa. If the temperature in the room is 26c, what is the patial pressure of the "dry" air??
a. 30.88 kPa
b. 101.60 kPa
c. 108.40 kPa
d. 357.00 kPa
Answer:
Option B. 101.60 KPa
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 105.00 KPa
Partial pressure of wet gas (Pᵥᵥ) at 26 °C = 3.4 KPa
Partial pressure of dry gas (Pₔ) =?
Total pressure = partial pressure of dry gas + partial pressure of wet gas
Pₜ = Pₔ + Pᵥᵥ
105 = Pₔ + 3.4
Collect like terms
105 – 3.4 = Pₔ
Pₔ = 101.60 KPa
Therefore, the partial pressure of the dry gas is 101.60 KPa
Help please...........
Softening of water is the application of
Answer:
Water softening is the process of removing the dissolved calcium and magnesium salts that cause hardness in water
Explanation:
5.
Which is the best example of Newton's Second Law of Motion?
Answer:
ok so if I remember correctly then it basically its like if I have a baseball and throw it full force the the ball will go far because the mass is light and the force was great but if I get a bowling ball and do the same with equal force it will go shorter than the base ball because the mass if more than the force I put in
answer with explanation and you get brain list
Answer:
B.
Explanation:
There are the same amount of black circles in the reactant and product. There are also the same amount of white circles in the product and reactant.
What is the molarity of 2.5 mol of H2SO4 dissolved in 1.00 L of solution?
Need FAST!
Answer:
2.5 M H2SO4
Explanation:
2.5 mol / 1.00 L = molarity of 2.5
An oxygen molecule is adsorbed on a patch of surface (see sketch at right). This patch is known to contain adsorption sites. The molecule has enough energy to move from site to site, so it could be on any one of them. Suppose part of the surface becomes inaccessible, so that only adsorption sites are now available for the molecule. Calculate the change in entropy. Round your answer to significant digits, and be sure it has the correct unit symbol.
This question is incomplete, the complete question is;
An oxygen (O₂) molecule is adsorbed on a patch of surface (see sketch at right). This patch is known to contain 324 adsorption sites.
The (O₂) molecule has enough energy to move from site to site, so it could be on any one of them.
Suppose part of the surface becomes inaccessible, so that only 400 adsorption sites are now available for the molecule.
Calculate the change in entropy.
Round your answer to 3 significant digits, and be sure it has the correct unit symbol.
Answer:
the change in entropy is 2.91 x 10⁻²³ J/K
Explanation:
Given the data in the question;
For an ideal gas,
Entropy of a molecule, S = K[tex]_B[/tex] ln(W)
where K[tex]_B[/tex] is Boltzmann constant (1.38065 x 10⁻²³ J/K)
W is Equivalent micro states of the molecule
( W[tex]_{initial}[/tex] = 324 and W[tex]_{final}[/tex] = 400 )
S[tex]_{final}[/tex] - S[tex]_{initial}[/tex] = K[tex]_B[/tex] ln(W[tex]_{final}[/tex]) - K[tex]_B[/tex] ln(W[tex]_{initial}[/tex] )
ΔS = K[tex]_B[/tex] ln(W[tex]_{final}[/tex] / W[tex]_{initial}[/tex] )
we substitute
ΔS = (1.38065 x 10⁻²³ J/K) × ln( 400 / 324 )
ΔS = 2.9093 x 10⁻²³ J/K
ΔS = 2.91 x 10⁻²³ J/K
Therefore, the change in entropy is 2.91 x 10⁻²³ J/K
The molecule with only single covalent bonds is _. (C) *
CO2
СО
CI2
ON2
Answer:
CO (carbon monoxide)
Explanation:
Please help due tofay
Answer:
I only know the answer to the second one, The bond that occurs between two metal atoms is a metallic bond
25. Classify the following as element, compound or mixture and explain how do you know?
a) NaCI + H2O
b) C2H4O
c) O2
d) Co
e) CO
f) H2 + O2
g) H2O2
Answer:
A Mixture
B compound
C element
D element
E. Compound
F mixture
G compound
Explanation:
A compound is formed from the chemical reaction between two or more atoms
A Mixture is formed when two or more elements are physically combined
An element is any substance that contains only one kind of an atom
how many molecules are in 6.31 moles of CO2
Answer:
Quantity of substance = (number of moles / number of molecules)
Explanation:
How much does carbon dioxide weigh?
Give me the answer to calculate for you
2.0 mole of water at STP would occupy what volume?
a) 22.4
b) 22.7
c) 44.8
d) 45.4
plzzz help me
Water is stored in the _________________________ until it is used by the cell.
Answer:
cell sap :)
Explanation:
Answer:
well
Explanation:
words that mean the same thing
decrease,
diminish,
dwindle
Answer:
Subside
Explanation:
Answer:
lower, reduce, decline
Explanation:
Faces:
13. Explain why a solution containing both NH3 and NH4Cl is less basic than a solution
containing only NH3 of the same concentration.
Answer:
In a solution containing ammonia solution and ammonium chloride, ammonia hydrolyses in water to produce hydroxyl ions.
NH3 +H2O → NH4+ + OH-
Ammonium chloride ionises in the solution to produce ammonium ions and chloride ions where the ammonium ions undergo hydrolysis to produce more ammonia solution.
[tex]NH _{4} Cl→NH _{4} {}^{ + } + Cl {}^{ - } [/tex]
`1. the products in a reactions will always have...
(a) the same total mass as the reactants
(b)the same number of molecules as the reactants
(c) less mass than the reactants
(d) a greater number of molecules than the reactants
Answer:
a
Explanation:
as the law of conservation of matter (mass) states: matter can not be created nor destroyed but can transform from a form to another.
since the conversion of mass to energy can not be done except in nuclear reactions via (E= mc2). normal chemical equations must be balanced to achieve the law.
Which shape is being shown by the model?
Sort the numbers based on the number of significant figures they have.
Drag each tile to the correct location.
One Significant
Figure
Two Significant
Figures
Three Significant
Figures
Four Significant
Figures
Answer:
I think one significant figure??
What category of biological molecules are steroids included in?
Answer:
Lipids
Explanation:
Lipids are a class of macromolecules that are nonpolar and hydrophobic in nature. Major types include fats and oils, waxes, phospholipids, and steroids.
Hope this helps!
50 points
In the image below, light is displayed as particles called photons. Research to find out what photons are and then explain in your own words why they can be useful for modeling light.
Answer:
A photons is a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
Explanation:
Light consists of packets of energy (photons) that can only interact with the atoms and molecules of matter by being absorbed or emitted in discrete units. ... Photons carry momentum and energy like particles, but they also have a frequency and a wavelength like a sinusoidal wave. Thanks to photons we know that all quantum particles have both the properties of waves and particles. I hope it helps✌️
How does Barium obey the octet rule when reacting
to form compounds?
A. It gains electrons
B. It gives up electrons
C. It does not change its number of electrons
D. Oxygen does not obey the octet rule.
Answer:
it gives up electrons B. because the bond between the electrons is not very strong due to how few of them there are
Explanation:
According to an energy pyramid model, which trophic level is expected have the largest biomass in land ecosystems ?
Answer:
According to an energy pyramid model, Producer is expected have the largest biomass in land ecosystems
Explanation:
In a trophic level, the producers possess the largest biomass. With the increasing trophic level, the biomass reduces. Hence, the producers at the base have high biomass.
On terrestrial ecosystem, the producers are the plants and trees and hence the greatest biomass exists in the plants and trees.
Hence, in an energy pyramid model, Producer is expected have the largest biomass in land ecosystems
Match the procedural step to its purpose by dragging each step in the written procedure for the Fischer esterification of benzoic acid with methanol in the presence of mineral acid into the appropriate box. Purpose: Flat-bottomed flasks transfer heat in an uneven fashion, and may fracture if heated strongly. Procedure: Purpose: Methanol, which is used as a reagent and solvent, is flammable. Prodedue: Purpose: The unreacted carboxylic acid was neutralized under mild conditions. Procede: Purpose: Water needs to be removed before the liquid ester product is collected. Procedure:
Answer:
Explanation:
The task in this question is to match the right procedure to its purpose. It explains the procedure for the preparation of Fischer Esterification. Fischer Esterification Mechanism should incorporate the ceaseless expulsion of water from the framework or the use of a huge amount of excess alcohol since the general reaction is reversible. Fischer Esterification act as an organic reaction that is utilized to change over carboxylic acids within the sight of excess alcohol and a solid corrosive catalyst (acid) to give an ester as the eventual outcome.
Procedure Purpose
[tex]\text{Flat bottomed flask transfer}\\ \\ \text{ heat in an uneven fashion and } \\ \\ \text{ may fracture if heated strongly}[/tex] [tex]\text{The reagents were added to a} \\ \\ \text{round bottom flask prior to the }\\ \\ \text{reaction being heated under reflux}[/tex]
[tex]\text{Methanol which used as a reagent} \\ \\ \text{and solvent is flammable}[/tex] [tex]\text{The solution of benzoic acid and }\\ \\ \text{methanol was heated on steam bath}[/tex]
[tex]\text{The unreacted carboxylic acid was} \\ \\ \text{neutralized under mild conditions}[/tex] [tex]\text{The reaction mixture was washed} \\ \\ \text{ with sodium bicarbonate solution}[/tex]
[tex]\text{Water needs to be removed before the} \\ \\ \text{ liquid ester product was collected}[/tex] [tex]\text{Magnesium sulphate is added to the} \\ \\ \text{ dichloromethane layer before} \\ \\ \text{ the solvent is distilled off}[/tex]
thats ridiculously ridiculous
Answer: beautiful
Explanation:
what is the kg of the net force is 30 N and the acceleration is 6 m/s 2
Answer:
5kg
Explanation:
Use the law: F=MA
F= force which is newton
M= mass which is kg
A= acceleration which is [tex]m/s^{2}[/tex]
An airplane flew 3043 km from Houston to Seattle in 5.5 hours. What was the average speed, in m/s rounded to the nearest hundredth, of the airplane from Houston to Seattle?
An airplane flew 3043 km from Houston to Seattle in 5.5 hours. What was the average speed, in m/s rounded to the nearest hundredth, of the airplane from Houston to Seattle?
The answer is 553
Answer:
553
Explanation:i did this question today and it was right!
what metric unit would be most appropriate to use when measuring the length of a paperclip?
A. millimeter
B. kilometer
C. decimeter
D. centimeter
centimetres
Explanation:
centimetres
Answer:
D. Centimeter is used when measuring the length of a paperclip
Describe the stages of water cycle
i really kinda need some hell right now :)
Why is having a healthy lion population in an African savanna important for maintaining biodiversity in that ecosystem?
C
If the population of lions decreases, there would be less water available for other animals like zebras and antelopes, leading to drought in the ecosystem.
.
The lions are better at hunting animals like zebras and antelopes, ensuring that other predators like cheetahs and hyenas will be outcompeted and eventually become
extinct.
.: +
O
The lions eat enough of the zebras, antelopes, and other plant-eating animals to ensure that they do not overgraze the grass and trees, leading to starvation of the other
animals.
Without the lions to eat animals like zebras and antelopes, there would be fewer predators to consume these animals, causing the zebras and antelopes to consume each
other.
K
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AQDd
1:45 PM
3/11/2021
Answer:c
Explanation:
The healthy lion population in the African savanna has been important as the decrease in the population of lions results in the increase in the increased population of zebras and antelopes and thereby the increased overgrazing. Thus, option C is correct.
In an ecosystem, the biotic components have been arranged in the pyramidical order that has been able to maintain a healthy ecosystem.
The increase or decrease in the level of the ecosystem results in the disturbed ecosystem and thereby the biodiversity. The African savanna has been the forest ecosystem. It has been photosynthetic plants, followed by primary, secondary, and tertiary consumers.
The lion has been the secondary consumer in the forest system. The lions have been able to consume the primary consumers and maintain the balance in the ecosystem.
However, with the decrease in the lion population in the ecosystem, there has been a proportional increase in the population of the primary consumers such as zebras, and antelopes.
The increase in primary consumers results in overgrazing and thereby the starvation of other primary consumers with a decrease in the producers.
Thus, a decrease in the lion population results in disturbing the biodiversity of the ecosystem with an increase in the population of zebras and antelopes. Thus, option C is correct.
For more information about the African Savannas ecosystem, refer to the link:
https://brainly.com/question/4088008