Answers
Answer:
100 mL of Na2CO3
Explanation:
We'll begin by calculating the number of mole in 1 g of CaCO3. This can be obtained as follow:
Mass of CaCO3 = 1 g
Molar mass of CaCO3 = 100.09 g/mol
Mole of CaCO3 =?
Mole = mass /Molar mass
Mole of CaCO3 = 1/100.09
Mole of CaCO3 = 0.01 mole
Next, we shall determine the number of mole of Na2CO3 needed to produce 0.01 mole of CaCO3.
This is illustrated below:
Na2CO3 + CaCl2 —> 2NaCl + CaCO3
From the balanced equation above,
1 mole of Na2CO3 reacted to produce 1 mole of CaCO3.
Therefore, 0.01 mole of Na2CO3 will also react to produce 0.01 mole of CaCO3.
Next, we shall determine the volume of Na2CO3 needed for the reaction as illustrated below:
Mole of Na2CO3 = 0.01 mole
Molarity of Na2CO3 = 0.1 M
Volume of Na2CO3 solution needed =?
Molarity = mole /Volume
0.1 = 0.01 / volume of Na2CO3
Cross multiply
0.1 × volume of Na2CO3 = 0.01
Divide both side by 0.1
Volume of Na2CO3 = 0.01 / 0.1
Volume of Na2CO3 = 0.1 L
Finally, we shall convert 0.1 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.1 L = 0.1 L × 1000 mL / 1 L
0.1 L = 100 mL
Thus, 0.1 L is equivalent to 100 mL.
Therefore, 100 mL of Na2CO3 is needed for the reaction.
The volume of sodium carbonate used in the given reaction is 0.1 liter or 100mL.
How we calculate the volume from molarity?Volume of the solution will be calculated by using the molarity as:
M = n/V, where
n is the moles of solute and this can be calculated as:
n = W/M , where
W = given or required mass
M = molar mass
Given chemical reaction is:
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl
Moles of 1g of CaCO₃ = 1g/100g/mole = 0.01 moles
From the stoichiometry of the reaction, it is clear that same moles of CaCO₃ produced by same moles of used Na₂CO₃.
0.01 moles of CaCO₃ = produced by 0.01 moles of Na₂CO₃
Now we calculate the volume of 0.01 moles and 0.100M of Na₂CO₃ as:
V = n/M
V= 0.01/0.100 = 0.1L or 100mL
Hence 0.1 L is the required volume.
To know more about molarity, visit the below link:
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Related Questions
What is a goal of environmentalists? O A. Conservation of the environment O B. Protection of the environment O C. Public awareness of the environment O D. All of the above
Answers
Answer:
B?\
Explanation:
A goal of environmentalists is the protection of the environment.
What is an environment?The biotic and abiotic factors which surrounds living organisms are known as environment. To put it in simple word, it is a community of organisms living in a particular environment and the physical elements in that environment with which they interact.What is the role of environmentalists?Environmentalist preserve the air and water; as well as conserve and protect entire ecosystems compromising of animals, plants and humans found in different habitats throughout our planet.
Environmentalists help the public make informed decisions about the use of limited natural resources. They do research, produce reports, write articles, campaign etc.
Hence, option b is the correct answer.
To learn more about environment and environmentalists here
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If an atom has 25 protons how many electrons will it have orbiting its nucleus?
ОО
O 25
O 12
Electrons don't orbit the nucleus
Answers
Answer:
If the atom is nuetral it will have 25 electrons as there is the same number of electrons and protons if the atom is nuetral. Yes electrons do orbit the nucleas. Electrons orbit in orbitals which have corresponding energy levels.
Explanation:
I have a masters in Algebra II
A 500.0-mL buffer solution is 0.100 M in HNO2 and 0.150 M in KNO2. Determine if each addition would exceed the capacity of the buffer to neutralize it.
a. 250 mg NaOH
b. 350 mg KOH
c. 125 g HBr
d. 1.35g Hl
Answers
Answer:
no one additions exceed the capacity of the buffer
Explanation:
given
Volume buffer = 500.0 mL = 0.5 L
mol HNO₂ = 0.5 L × 0.100 mol/L = 0.05 mol HNO₂
mol NO₂⁻ = 0.5 L × 0.150 mol/L = 0.075 mol NO₂⁻
solution
we know when any base more than 0.05 (HNO2) than exceed buffer capacity
and when any base more than 0.075 (KNO2) than exceed buffer capacity
when we add 250 mg NaOH (0.250 g)
than molar mass NaOH =40 g/mol
and mol NaOH = 0.250 g ÷ 40g/mol
mol NaOH = 0.00625 mol
0.00625 mol NaOH will be neutralized by 0.00625 mol HNO₂
so it would not exceed the capacity of the buffer.
and
when we add 350 mg KOH (0.350 g)
than molar mass KOH =56.10 g
and mol KOH = 0.350 g ÷ 56.10 g/mol
mol KOH = 0.0062 mol
here also capacity of the buffer will not be exceeded
and
now we add 1.25 g HBr
than molar mass HBr = 80.91 g/mol
and mol HBr = 1.25 g ÷ 80.91 g/mol
mol HBr = 0.015 mol
0.015 mol Hbr will neutralize 0.015 mol NO₂⁻
so the capacity will not be exceeded.
and
we add 1.35 g HI
molar mass HI = 127.91 g/mol
so mol HI = 1.35 g ÷ 127.91 g/mol
mol HI = 0.011 mol
capacity of the buffer will not be exceed
please help me out I need some ideas for cell city project or comic strip by tonight or if you did it already lemme copy it={
Answers
Answer:
Can you give me your snap, so I can send you the foto
What is a lubricant? How does it
impact the force of friction when
applied to a surface?
Answers
J.J. Thomson's plum pudding model of the atom followed the discovery of
A)
negatively charged particles with a very small mass.
B)
positively charged particles with a very large mass.
0)
negative electrons that revolved around a positive nucleus.
D)
positively charged protons that were contained in a concentrated area.
Answers
J.J. Thomson's plum pudding model of the atom followed the discovery of negatively charged particles with a very small mass. Thus, the correct option for this question is A.
Who was J. J. Thomson?J.J. Thomson was a British physicist who discovered sub-atomic particles known as electrons within an atom. He also announced that atoms are made up of smaller components.
The plum pudding model is defined by Thomson in order to demonstrate that negatively charged sub-atomic particles known as electrons are surrounded by a volume of positively charged particles known as protons. It is one of the historical scientific model of the atom that governs all sorts of properties of sub-atomic particles.
Therefore, "negatively charged particles with a very small mass" is the discovery that follows J.J. Thomson's plum pudding model of the atom. Thus, the correct option for this question is A.
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A very new item just arrived in the market. It is very good for construction, and other things. Now, this item has chemicals, and in every drop, there are 400 grams of NaCI. If there are 10 drops in this item, how many grams of NaCI are in one bottle?
Answers
Answer: 4,000 grams of NaCI
Explanation:
We know that there are 400g of NaCI in one drop.
This bottle has 10 drops of this item.
So, we have to multiply the amount of NaCI in a drop by the amount of drops.
400 x 10 = 4,000.
The answer to the question is 4,000. Hope this helps!
What happens to the gravitational potential energy of an object if you bring it higher with respect to the ground? *
Answers
Answer:
Increases
Explanation:
The gravitational potential energy of an object increases as you bring it higher with respect to the ground.
Gravitational potential energy depends on the mass, height and gravity between two bodies;
Gravitational potential energy = mgh
m is the mass
g is the height
h is the height
We can clearly see that the higher the elevation, the more the value of the gravitational potential energy.Need help!!
A sample of water is currently boiling. What phase(s) is/are present?
gas
Liquid
solid
Answers
Answer:
a
Explanation:
What happens when the particles of a gas collide?
A. They vibrate in place
B. They stick to one another
C. They become particles of a solid
D. They bounce off one another
Answers
Answer:
A
Explanation:
A. The chemical formula for iron (III) sulfate is Fe2(SO4)3. How many atoms of each element are present?
2 iron, 3 sulfur, 12 oxygen
3 iron, 3 sulfur, 12 oxygen
2 iron, 1 sulfur, 4 oxygen
6 iron, 3 sulfur, 12 oxygen
B.How many moles of hydrogen are in 1.8 mole(s) of quinine?
Express your answer using two significant figures.
C. How many moles of carbon are in 5.4 moles of quinine?
Express your answer using two significant figures.
D. How many moles of nitrogen are in 2.0×10−2 mole of quinine?
Express your answer using two significant figures.
Answers
Answer:
A. 2 Fe, 3 S and 12 O
B. 43 moles of H
C. 1.0×10² moles of C
Explanation:
A. Formula for iron (III) sulfate is Fe₂(SO₄)₃
This salt has 2 atoms of iron and 3 sulfates, so in total we have:
2 Fe, 3 S and 12 O
Pay attention to the subscripts
B. Formula for quinine is: C₂₀H₂₄N₂O₂
If we continue with the example before we can say that 1 mol of Iron (III) sulfate contains 2 moles of Fe, 3 moles of S and 12 moles of O
Then, 1 mol of quinine contains 24 moles of H
So 1.8 moles of quinine, may contain (1.8 . 24) /1 = 43 moles of H
C. 1 mol of quinine contains 20 moles of C
5.4 moles of quinine may contain (5.4 . 20) /1 = 1.0×10²
(As the answer must be in 2 significant figures and the real answer is 108, I had to use scientific notation)
What is the characteristic of all ions
Answers
Answer:
They have one overall charge
Explanation:
Negative or positive
How many grams of copper (II) hydroxide can be prepared from 2.4 grams of copper (II) nitrate (Cu(NO3)2 ) and excess sodium hydroxide?
Answers
Answer:
percentage yield = 67%
Explanation:
Mass of Cu(NO₃)₂ = 15.25 g
Mass of NaOH = 12.75 g
Percentage yield = ?
Solution:
Cu(NO₃)₂ + 2NaOH → Cu(OH)₂ + 2NaNO₃
Moles of Cu(NO₃)₂:
Number of moles = mass/ molar mass
Number of moles = 15.25 g /187.56 g/mol
Number of moles = 0.08 mol
Moles of NaOH :
Number of moles = mass/ molar mass
Number of moles = 12.75 g / 40 g/mol
Number of moles = 0.32 mol
Now we will compare the moles of Cu(OH)₂ with NaOH and Cu(NO₃)₂. NaOH : Cu(OH)₂
2 : 1
0.32 : 1/2×0.32 = 0.16 mol
Cu(NO₃)₂ : Cu(OH)₂
1 : 1
0.08 : 0.08
The number of moles produced by Cu(NO₃)₂ are less so it will limiting reactant.
Mass of Cu(OH)₂:
Mass = number of moles × molar mass
Mass = 0.08 mol × 97.6 g/mol
Mass = 7.808 g
Theoretical yield = 7.808 g
Percent yield:
percentage yield = Actual yield/ theoretical yield × 100
percentage yield = 5.23 g/ 7.808 g × 100
percentage yield = 0.67 × 100
percentage yield = 67%
1.3 grams of copper (II) hydroxide can be prepared from 2.4 grams of copper (II) nitrate (Cu(NO₃)₂) and excess sodium hydroxide.
Let's consider the following balanced double displacement reaction.
Cu(NO₃)₂ + 2 NaOH ⇒ Cu(OH)₂ + 2 NaNO₃
2.4 g of Cu(NO₃)₂ (molar mass 187.56 g/mol) react. The reacting moles of Cu(NO₃)₂ are:
[tex]2.4 g \times \frac{1mol}{187.56g} = 0.013 mol[/tex]
The molar ratio of Cu(NO₃)₂ to Cu(OH)₂ is 1:1. The moles of Cu(OH)₂ produced from 0.013 moles of Cu(OH)₂ are:
[tex]0.013molCu(NO_3)_2 \times \frac{1molCu(OH)_2}{1molCu(NO_3)_2} = 0.013 molCu(OH)_2[/tex]
The molar mass of Cu(OH)₂ is 97.56 g/mol. The mass corresponding to 0.013 moles of Cu(OH)₂ is:
[tex]0.013 mol \times \frac{97.56g}{mol} = 1.3 g[/tex]
1.3 grams of copper (II) hydroxide can be prepared from 2.4 grams of copper (II) nitrate (Cu(NO₃)₂) and excess sodium hydroxide.
You can learn more about stoichiometry here: https://brainly.com/question/22288091
When comparing plant and animal cells which statement is least accurate?
Plant cells have a cell wall and animal cells do not.
Plant cells have chloroplasts and animal cells do not.
Plant cells have a large central vacuole and animal cells do not.
Plant cells have cell membranes and animal cells do not.
Answers
Hope it helps:)
Consider the following equilibrium.
NH3(aq) + H2O(l) equilibrium reaction arrow NH4+(aq) + OH −(aq)
What will happen to the equilibrium constant if the concentration of OH − increases through the addition of a small amount of NaOH(aq)?
Answers
Answer:
It will remain the same
Explanation:
The equilibrium constant of the reaction will remain the same if the concentration of the OH is increased.
Changes in concentration values of any of the reactant does not affect the value of the equilibrium constant.
The equilibrium constant is a constant at a given temperature. It is temperature dependent. Since we have no change in temperature, therefore, the equilibrium constant will not change.The equilibrium constant if the concentration of OH − increases through the addition of a small amount of NaOH(aq) is :
- Remains same.
Equilibrium ReactionThe equilibrium constant of the response will stay the same in case the concentration of the OH is increased.
Changes in concentration values of any of the reactant does not influence the esteem of the equilibrium constant.
The equilibrium constant may be a consistent at a given temperature.
It is temperature dependent. Since we have no alter in temperature.Learn more about "Equilibrium":
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How many atom of oxygen are in 2mole of O2
Answers
Answer:
12.044 × 10²³ atoms of oxygen
Explanation:
Given data:
Number of atoms of oxygen = ?
Moles of oxygen = 2 mol
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms of oxygen
2 mole × 6.022 × 10²³ atoms of oxygen / 1 mole
12.044 × 10²³ atoms of oxygen
[H3O+] = 2.6 x 10-3 M calculate OH
Answers
Answer:
3.85E-12
Explanation:
from
KW=[H3O+]×[OH]
BUT KW=1E-14
0.954 mol bromine is added to 1 L reaction vessel that contains 1.22 mole of hydrogen and 1 mole of HBr at 1500K. What is the partial pressure of hydrogen, bromine and HBr at equilibrium?
Answers
Answer:
Partial pressure of H₂ → 149.9 atm
Partial pressure of Br₂ → 117.2 atm
Partial pressure of HBr → 112.8 atm
Explanation:
The problem can be solved by the Ideal Gases Law.
In a mixture of gases we know that the sum of partial pressures values the total pressure in the vessel. And the total pressure in the vessel is generated by the total moles which are presennt.
Total moles = 0.954 moles + 1.22 moles + 1 mol = 3.174 moles
Let's apply the Law to determine the total pressure.
P . 1 L = 3.174 moles . 0.082 . 1500 K
P = 390.4 atm
Now we apply the mole fraction concept
Mole fraction (1) → moles of gas / total moles
Mole fraction (2) → partial pressure of gas / total pressure
In conclussion 1 = 2
Partial pressure of H₂ → (1.22 / 3.174) . 390.4 atm = 149.9 atm
Partial pressure of Br₂ → (0.954 / 3.174) . 390.4 atm = 117.2 atm
Partial pressure of HBr → (1 / 3.174) . 390.4 atm = 112.8 atm
The maximum speed limit on a highway is 55 miles per hour. What is that speed in meters per second? (mi = 1.609 km)
Answers
Answer:
24.5872 meters per second
Rouned 24.6 or 25
I WILL GIVE YOU A BRAINLIEST: Bryce observes that the sun always seems to rise in the east. He talks with others and finds that everyone has the same observation. Which term describes this equation? A) the sun rises in the east B) Why does the sunrise in the east? C) The sun appears in the east because of Earth’s rotation pattern. D) If the sun appears in the east, then I am in the Western Hemisphere.
Answers
Answer: C
Explanation:
No matter the location on Earth, the sun always rises in the east due to its rotation pattern.
HURRY PLSsss if right gets brilliant
Answers
Answer: C hope this helps Have a wonderful day :)
Explanation:
160 g or an element with a molar mass of 40 = __ moles?
Answers
Answer:
4 moles
Explanation:
The formula of finding moles is
moles = mass / molar mass, therefore
moles = 160 g / 40 g/mol = 4 moles
THIS QUESTION IS HARD BUT I NEED HELP AND ITS DUE IN 20 MINS. YOU HAVE TO ANSWER A AND B FOR EVERYTHING TO BE CORRECT. I KNOW YALL ARE SMART PLSS HELP. THANKS!!
Answers
Consider the following set of replicate measurements: Set A: 3.6 , 4.2 , 6.5 , 5.5 , 4.9 . The median is
2 points
4.2
5.2
6.5
3.6
5.5
4.9
Answers
Answer:
the median i think it is 6.5
How many days will it take for 80 grams of Iodine-131 to decay to 5 grams?
Answers
32 days
Further explanationGeneral formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
t = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
The half-life of iodine-131 is 8 days
No=80 g
Nt=5 g
[tex]\tt 5=80(\dfrac{1}{2})^{t/8}\\\\\dfrac{5}{80}=\dfrac{1}{2}^{t/8}\\\\\dfrac{1}{2}^4=\dfrac{1}{2}^{t/8}\\\\4=\dfrac{t}{8}\rightarrow 32~days[/tex]
Scientists discover remains of wooden structures near a Celtic runes site. What kind of testing will indicate when the stones were moved into place by the Celts?
Carbon dating
Radioactive dating
Answers
Answer:
Carbon
Explanation:
Bc i got this question on my test
Answer:
A. Carbon dating
Explanation:
I took the test proof
Rank the following in order from the lowest to highest ionization energy?
Bi, Cs, Ba
Answers
Answer:
Cs,Ba, Bi
Explanation:
Ionization energy increases across the period from left to right on the periodic table
what do seismic waves do
Answers
Answer:
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. They are the energy that travels through the earth and is recorded on seismographs. ... Earthquakes radiate seismic energy as both body and surface waves.
Answer:
they are caused from earthquakes
Explanation:
Earthquakes and underground explosions can release a lot of energy. That energy ripples away from its source in a variety of ways. Some of those vibrations will move forward and back through the material they travel through . Other waves travel just like ocean waves, where they make the material they pass through move up and down compared to the direction the wave is traveling. And while some of these waves travel deep within the planet, still others move only along the surface. Studying where these various flavors of waves are and how they move not only can help scientists pinpoint where an earthquake or explosion occurred, but also can shed light on the structure of our inner planet.
9.
Which of the following molecules has (have) polar bonds?
a water
b carbon dioxide
c formaldehyde
d two of the above
Answers
Answer:
two of the above
Explanation:
cK-12 Bond Polarity
WILL MARK BRAINLIEST:
Identify the dichotomous key: plz answer:::: Each of these aliens belongs to the same genus. What is their genus?
Answers
Answer:
Alienus
Explanation:
