Answer: The concentration of this solution is [tex]114g/dm^3[/tex]
Explanation:
Concentration of a solution is defined as the number of grams of solute dissolved per liter of the solution.
Given : mass of solute = 28.4 g
volume of solution = [tex]250cm^3=0.25dm^3[/tex] [tex]1cm^3=0.001dm^3[/tex]
[tex]Concentration=\frac{28.4g}{0.25dm^3}=114g/dm^3[/tex]
Thus the concentration of this solution is [tex]114g/dm^3[/tex]
By definition and change of units, the concentration of this solution is 113.6 [tex]\frac{grams}{dm^{3} }[/tex].
Chemical concentration determines the ratio of solute and solvent in a chemical solution and is defined as the ratio of the amount or volume of solute to the amount of solution. The more solute, the higher the concentration in a solution.
In this case, you know:
mass of solute= 28.4 g
volume of solution= 250 cm³= 0.25 dm³ (being 1 cm³= 0.001 dm³)
Then, the concentration can be calculated as:
[tex]concentration= \frac{28.4 grams}{0.25 dm^{3} }[/tex]
Concentration= 113.6 [tex]\frac{grams}{dm^{3} }[/tex]
Thus the concentration of this solution is 113.6 [tex]\frac{grams}{dm^{3} }[/tex].
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Please answer this for points
Determine the mass in grams of 3.45 x 10^2 mol Co.
Answer:
molar mass CO = 28.01 g/mol
3.45 x 10^2 x 28.01 =9.66 x 10^3 g
mass Zn = 2.45 x 10^-2 x 65.39 g/mol=1.60 g => 1.60 x 10^0
Explanation:
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One mole of cobalt weighs 58.9 grams. Hence the mass in grams of 345 moles of cobalt is 20320.5 g.
What is cobalt?Cobalt is 27th element in periodic table. It is place in d- block of periodic table and is termed as transition metal. Transition metals sows variable oxidation states.
The atomic number of cobalt is 27. Thus, it contains 27 protons and 27 electrons. The mass number is 57. The mass of a given number of moles of an element can be calculated by multiplying its atomic mass by number of moles.
The atomic mass of cobalt = 58.9 g/mol
The mass of one mole of cobalt is 58.9 g/mol.
Thus, the mass of 345 moles of cobalt is calculated as follows:
mass of 345 moles of Co = 345 mol × 58.9 g/mol = 20320 g.
Therefore, the mass of cobalt in 345 moles is 20320 grams.
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Which best illustrates the way in which radiation transfers thermal energy?
#edge2021
Answer:
it's b.
Explanation:
thank u so much for this. i appreciate it. lol.
A chipmunk has a mass of 0.7 kg. What is its weight? (Acceleration due to gravity on Earth is 9.8 m/s2).
Answer:
W=ma
=0.7×9.8
=6.86N
....................
PLEASE GIVE BRAINLIEST
The Reaction
A+ B → C
was carried out in a constant-volume batch reactor where the following concentration measurements were recorded as a function of time:
t min 0 5 9 15 22 30 40 60
CA/mol/L 2 1.6 1.35 1.1 0.87 0.7 0.53 0.35
Required:
Determine the reactor order and the specific rate constant If you were to take more data, where would you place the points
Answer:
Explanation:
From the information given:
We can say that the rate of reaction is utilized to decide the reaction speed, and it is subject to the rate constant.
The power of concentration related to the rate equation can be said to be the order of the reaction.
For zero-order reaction: it is the reaction whose rate is free and not dependent on the reactant's concentration.
Concentration-time reaction is given as;
[tex]\mathbf{[A] = [A_o] -kt ---- (1)}[/tex]
where;
t = time
k = rate constant
A_o = initial concentration of reactant
Thus, the plot between [A] and t needs to be a straight line.
On the other hand, The First order reaction is the reaction whose rate is straightforwardly corresponding to the reactant's concentration.
Its concentration-time relation can be expressed as,
[tex]\mathbf{In([A])= In ([A_o])-kt ---- (2)}[/tex]
t = time
k = rate constant
[A_o] = initial concentration of the reactant
Then, the plot between [A] & t requires to be a straight line.
Presently, the plot between ln([A]) vs time appears to be in a straight line with the slope of the line equivalents to the rate constant (k).
hence,
slope = -k
Then;
[tex]\mathbf{k = -slope ---- (3)}[/tex]
Now; to discover the activation energy we need to utilize Arrhenius relation which is given as,
[tex]\mathbf{In(k) = In(K_o) - \dfrac{E_o}{RT} ---- (4)}[/tex]
From the above equation;
k_o = arrhenius parameter
Ea = activation energy
R = 8.314 J/mol.K
T = temperature in Kelvin
From the data given for concentration vs time;
t[min] Ca(mol/L)
0 2
5 1.6
9 1.35
15 1.1
22 0.87
30 0.7
40 0.53
60 0.35
a)
Since we can deduce the order of the reaction,
Let's assume that it is a zero-order reaction, Thus, the plot of Ca vs t can be seen in the first image attached below;
From the diagram, it is clear and obvious that it is NOT a straight line.
Thus, we conclude that this order is NOT a zero-order.
However, let also assume that order is first order,
Now, from the second diagram showing the plot of ln(Ca) vs t, we can deduce that it is a straight line which implies that it is the order of the reaction is first order.
Therefore, the equation for the first order is given as;
[tex]\mathbf{In([A]) = In ([A_o])- kt}[/tex]
Recall that: the slope of the ln(A) v/s time will result in a rate constant,
Thus, from the graph we have;
slope = -0.0289 mol/L.min and:
slope = - k
Hence;
rate constant = k = 0.0289 mol/L.min and the order = 1st order
b)
On the off chance that we need to take more data points, we will like to take the data point in the scope of 40 min to 60 min time interval, on the grounds that the significant deviation is seen there. more information focuses will imply more accuracy.
what happens when a gas is heated in a closed metal container
Answer:
Hope this helps!!
Explanation:
Molecules of a gas move randomly. In a sealed container they exert a force when they collide with the container walls and this applies a pressure to the container. If the cylinders heat up enough, their pressure will increase and they will explode.
How to prepare 0.2mol of iodine in 13gram of the solution
Answer:
Hope this helps
Explanation:
How many Hg atoms are in 1.2mol Hg?
Plz tell me how you got it
Answer:
12
Explanation:
12
5 points
1. In this food pyramid, how much energy is available as the energy is
passed from one trophic level to another?
Energy pytanid
O 1%
10%
оооо
25%
O 50
Answer:
I'm purty sure it's 10% Cause that is what my teach said.
Explanation:
Have a good day fern!!!!
Which statements true about the total mass of the reactants during a chemical change? (5 points)
0
his destroyed during chemical reaction,
It is less than the total mass of the produce
It is equal to the total mass of the products,
is greater than the total mass of the products
list 5 of the signs that can identify the evidence of a chemical change.
Answer:
here are some ideas <3
Explanation:
burning of paper.
cooking of food
burning of wood
rotting of fruits.
frying egg
rusting of iron
mixing acid and base.
burning of candle
leaves changing color
melting of sugar.
baking
explosion of fireworks.
souring milk
digestion of food
fermentation
lighting matchstick
photosynthesis
decomposition of waste
Four students are carrying out different laboratory procedures.
-Piroja is mixing baking soda and vinegar
-Jason is heating water
-Kali is putting crushed ice and ice cubes on a table
-Francisco is separating iron filings.
Which experiment relies on convection?
A) Piroja
B) Jason
C) Kali
D) Francisco
THE CORRECT ANSWER IS B. JASON’S EXPERIMENT
#edge2021 unit test review 100%
Answer:
B: Jason's experiment
Explanation:
I did the Unit test review
Calculate the pH of a 0.187 M solution of a base that has a Kb = 5.86x10^-6
Answer:
[tex]pH=11[/tex]
Explanation:
Hello there!
In this case, since the ionization of the described base is:
[tex]base+H_2O\rightarrow OH^-+baseH^+[/tex]
Thus, the equilibrium expression in terms of the reaction extent is:
[tex]Kb=5.86x10^{-6}=\frac{x^2}{0.187-x}[/tex]
Thus, by solving for x we obtain:
[tex]5.86x10^{-6}({0.187-x})=x^2\\\\1.10x10^{-6}-5.86x10^{-6}x-x^2=0[/tex]
So the values of x are:
[tex]x_1=0.0010M\\x_2=-0.0010M[/tex]
So the feasible answer is 0.0010 M, thus we compute the pOH:
[tex]pOH=-log(0.0010M)=3[/tex]
And therefore the pH:
[tex]pH=14-pOH=14-3\\\\pH=11[/tex]
Best regards!
What is the work when a gas expands from 0.666 L to 2.334 L against an external pressure of 2.07 atm?
Answer:
work = 3.45 Joules
Explanation:
Work from the 1st Law of Thermodynamics is PΔV in the equation of internal energy => ΔE = ΔH + PΔV.
Therefore, work = PΔV = 2.07atm·(2.334L - 0.666L) = 3.45 L·atm = 3.45 Joules
What happens to the number of valence electrons as you move from element 1 to element 18 on the periodic table?
A.
the number of valence electrons decreases then increases in a predictable sequence
B.
the number of valence electrons increases
C.
the number of valence electrons increases then decreases in a predictable sequence
D.
the number of valence electrons decreases
Answer:
B
Explanation:
the group number is=valence electrons. element 1 is in group 1 element 18 is in group 8. 1<8
Answer:
the answer is b
Explanation:
i just know
Samantha plants some flowers in a flower bed and then ignores them. Soon weeds grow and the flowers die. The weeds had been able to get
enough resources to survive, while the flowers had not. This is an example of
O A) competition
OB) population size
OC) habitat
O D) community
Answer: The answer is actually competition
Explanation:
So she plants the flowers, then ignores them, not taking care of them. So when the weeds start to grow, and if they aren't pulled out, they start to steal the water from the flowers. So the flowers would try to take it back, but the weeds, because Samantha isn't taking care of them and pulling them out, keep growing. This lets the weeds take more water, causing the flowers to die.
Can someone please solve this????? It's true or false
Answer:
True true false true true true flase, false
Explanation:
plants, Animals, Protists and Fungi all belong to which domain?
Answer:
Eukarya
Explanation:
Organisms in the domain Eukarya keep their genetic material in a nucleus and include the plants, animals, fungi, and protists.
Why was plastic first invented? How is plastic bad for the environment?
Answer: The first plastic based on a synthetic polymer was invented in 1907. Plastic sticks around in the environment for ages, threatening wildlife and spreading toxins.
Hand lighters contain butane gas. If a hand lighter contains butane gas at 2.50 atm of
pressure at 293°K, then what would be the new pressure of the lighter if it were left in a
hot car at 393°K? If the lighter was designed to hold only 3.00 atm of pressure, would
it explode? Assume the volume does not change, until it possibly explodes!
Answer:
3.35 atm
Since P₂ > 3.00 atm, the lighter would explode.
Explanation:
Step 1: Given data
Initial pressure of butane gas (P₁): 2.50 atmInitial temperature of butane gas (T₁): 293 KFinal pressure of butane gas (P₂): ?Final temperature of butane gas (T₂): 393 KStep 2: Calculate the final pressure of butane gas
If we assume ideal behavior, we can calculate the final pressure of butane gas using Gay Lussac's law.
P₁/T₁ = P₂/T₂
P₂ = P₁ × T₂/T₁
P₂ = 2.50 atm × 393 K/293 K = 3.35 atm
Since P₂ > 3.00 atm, the lighter would explode.
If you have a balloon inside a car at noon during a hot summer day, the balloon molecules
inside will increase in pressure. (True/False)
Explain your answer.
Answer:
it decreases
Explanation:
because its false
Answer:
True
Explanation:
The pressure will increase because the heat will make the molecules move around and spread out more.
If you want I could go into more detail with the explanation.
in the periodic table, helium is placed at?
a. top left corner
b. bottom right corner
c. bottom left corner
d. top right corner
Answer:
the answer is d
Explanation:
top right corner
Calculate the number of moles of 67 point 2 dm3 of nitrogen gas at stp
Answer:
1 mol. = 0.169 mol He.
Consider the energy diagram below.
A graph with Reaction Progression on the x axis and Energy on the y axis. A line starts low on the y axis; this section runs horizontally and is labeled A. It rises sharply to a high round peak labeled C. A dotted line continues the initial line to a higher peak Over C, labelled B, and then falls back to the original line, which continues horizontally; this section is labeled D.
Which statement best describes the diagram?
The catalyzed reaction passes through C.
The energy of the catalyst is shown by A.
The reaction pathway through B is faster.
The energy of the reactants with catalyst is at D.
The statement best describes the diagram is the catalyzed reaction passes through C. Therefore, option A is correct.
What is an energy diagram ?An energy profile is a theoretical representation of a chemical reaction or process as a single energetic pathway as the reactants are transformed into products in theoretical chemistry.
The amount of relative potential energy in each step of a reaction is depicted by an energy diagram. Reactants, transition states, and products are typically depicted on energy diagrams. It may also include intermediates and activation energy, depending on the reaction.
There are two lines on the energy level diagram. The blue line denotes ground state energy, while the red line denotes excited state energy. The horizontal axis represents orbital energy, and the vertical axis represents total system energy.
Thus, option A is correct.
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Which molecule does not obey the Octate rule of valence electrons .
BeCl2
FeCl2
CuCl2
ZnCl2
Answer:
C po Hope it helps salamat
the best example of unbalanced forces is?
___Li + ___AlPO4 --> ___Al + ___Li3PO4
If 2.3 moles of Aluminum Phosphate are reacted, how many grams of Lithium Phosphate are produced?
Answer:
266.3 g
Explanation:
__Li + __AlPO₄ → __Al + __Li₃PO₄The balanced reaction is:
3Li + AlPO₄ → Al + Li₃PO₄First we convert 2.3 moles of AlPO₄ to moles of Li₃PO₄, using the stoichiometric coefficients:
2.3 mol AlPO₄ * [tex]\frac{1molLi_3PO_4}{1molAlPO_4}[/tex] = 2.3 mol Li₃PO₄Then we convert Li₃PO₄ moles into grams, using its molar mass:
2.3 mol Li₃PO₄ * 115.79 g/mol = 266.3 g79.2 L of a gas are contained at STP. How many moles are present in the container?
Answer:
3.54 mol
Explanation:
When at STP (Pressure of 1 atm & T of 273.16 K), one mol of any given gas occupies 22.4 liters.
With the above information in mind we can calculate the number of moles, using the factor 22.4 L/mol:
79.2 L ÷ 22.4 L/mol = 3.54 mol
There are 3.54 moles of the gas present in the container.
During what phase of meiosis does the DNA coil into visible chromosomes?
O prophase
O anaphase
O metaphase 1
o telophase!
Answer:
prophase
During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes.
Answer:
prophase I
Explanation:
What other elements does iron commonly bonds with.
☁️ Answer ☁️
annyeonghaseyo!
Your answer is:
it can bond with oxygen to form rust or iron oxide. and it can bond with carbon to form steel.
Here's another one: Iron bonds with lots of things: Oxygen (Ferric Oxide = rust),Chlorine (Ferric Chloride]), Fluorine, ... , even other Iron (in aMetallic Bond or crystal).
Hope it helps.
Have a nice day hyung/noona!~ ￣▽￣❤️