How many molecules are in 0.23 moles of CaCl2?
A) 2.62 x 10^24 molecules of CaCl2
B)1.39 x 10^23 molecules of CaCl2
C) 2.61x 10^23 molecules of CaCl2
D) 3.82 x 10^-25 molecules of CaCl2
Previous
Answer:
1.39 × 10²³ molecules of CaCl₂
Explanation:
Given data:
Number of moles of CaCl₂ = 0.23 mol
Number of molecules = ?
Solution:
Avogadro number:
The given problem will solve by using 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 molecules
0.23 mol × 6.022 × 10²³ molecules / 1mol
1.39 × 10²³ molecules
Approximately what percentage of a human's DNA is used for coding Information for the synthesis of proteins?
O 5%
O 25%
О 99%
O 95%
One percent of a human's DNA is used for coding Information for the synthesis of proteins.
What is DNA?
DNA is a hereditary material which is present in human beings as well as all other living organisms. Every cell which is present in an organism's body has DNA which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.
Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.
DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule and a phosphate group. A base, phosphate sugar are together called as nucleotides.
Learn more about DNA,here:
https://brainly.com/question/30006059
#SPJ6
Your question is incomplete, but most probably your full question was,approximately what percentage of a human's DNA is used for coding Information for the synthesis of proteins?
5%
25%
99%
95%
1%
An 240. mL sample of oxygen at 90.00C and was cooled at constant pressure
until it has a volume of 450.0 mL. What was the final Celsius temperature of this
gas? *
The final temperature : T₂ = 680.625 K
Further explanationGiven
V₁=240 ml
T₁ = 90 + 273 = 363 K
V₂ = 450 ml
Required
The final temperature
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
T₂ = V₂T₁/V₁
T₂ = 450 x 363 / 240
T₂ = 680.625 K
True or false most oils tend to dissolve best in nonpolar solvent
Answer:
true
Explanation:
water is polar, and oil and water do not mix. nonpolar solvents do not like or mix with water, so they do not dissolve in water. so it's true.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Pressure is the force
per
unit
a. volume.
b. surface area.
c. length
d. depth
Answer:
A or B
Explanation:
(NH4)2SO4. How many N are there?
A car left from its initial position at 6 pm. The car arrived at its final position at 11pm. How much time did it take the car to arrive ?
Answer:
5 hours.
Explanation:
Given that,
Initial time, [tex]T_i=6\ pm[/tex]
Final time, [tex]T_f=11\ pm[/tex]
We need to find how much time did it take the car to arrive.
Time = final time-initial time
= 11 pm - 6 pm
= 5
So, it takes 5 hours by car to arrive.
Does gases have a kinetic attraction? Yes or no.
Answer:
No
Explanation:
There are no interactive forces (i.e., attraction or repulsion) between the particles of a gas.
The average kinetic energy of gas particles is proportional to the absolute temperature of the gas, and all gases at the same temperature have the same average kinetic energy.
Please help me :D I’m begging rn lol
Answer:
To catch a ball, the fielder has to stop the ball. This means, force is applied against the motion of the ball. So, between the fielder applies force on the ball and the ball comes to rest, the ball moves in the direction opposite to the direction of force. Thus work is negative.
Explanation:
MARK ME AS BRAINLIEST PLSSS
What components make up an environment?
Answer:
Environment mainly consists of atmosphere, hydrosphere, lithosphere and biosphere. But it can be roughly divided into two types such as (a) Micro environment and (b) Macro environment. It can also be divided into two other types such as (c) Physical and (d) biotic environment.
Explanation:
what atom makes up the end of a pencil
Answer: carbon atoms
Explanation:
carbon atoms because carbon has an atomic mass of 12. Atomic mass is the mass of an atom. It is calculated as the sum of the number of protons and neutrons in the atom, because protons and neutrons make up the majority of the atom's mass.
help please you’ll get 18 points to answer this correctly
What type of chemical reaction is the following reaction:
carbon monoxide and oxygen yield carbon dioxide
Answer:
decomposition reaction
Carbon Tetrahydride reacts with Oxygen gas to form Carbon Dioxide gas and Dihydrogen Monoxide gas.
Explanation:
a letter stating three things that need urgent fixing in your school
Answer and Explanation:
Computers ( The computers are very old and very slow, and we have to notice that almost everyone are using computers at the same time at the school, which makes it even harder for it to load up assignments. )The Rick Rolling ( Everyone keeps sending links to teachers and students saying that it is part of some assignment but then you have to listen to Rick Astley, they should really block these links. )The lockers ( The lockers are also very old and they are breaking down and rusting a lot from the moisture in the hallways. One of the lockers even broke down today!!! I hope they can fix this so no one else gets hit with a locker door. )Hope this helps! ;)
How many kilo joules of heat are required to the decompost 1.96 mol Nah I 3(s)
Heat required = = 126.42 kJ
Further explanationGiven
1.96 mol NaHCO₃(s)
Required
Heat needed
Solution
Reaction( decomposition of Baking soda (NaHCO₃) :
2NaHCO₃ (s) + 129 kJ ⇒ Na₂CO₃ (s) + H₂O (g) + CO₂ (g)
For 2 mol NaHCO₃ , heat needed = 129 kJ
conversion factor :
[tex]\tt \dfrac{129~kJ}{2~mol}[/tex]
So for 1.96 mol :
= 1.96 mol x (129 kJ/2 mol)
= 126.42 kJ
What mass of oxygen combines with 2.81 mol
of magnesium in the reaction
2 Mg(s) + O2(g) → 2 MgO(s)?
22.48 g. mass of oxygen combines with 2.81 mol of magnesium in the reaction. For the reaction 2 Mg(s) + O2(g) → 2 MgO(s).
What do you mean by molar mass ?The term molar mass is defined as the mass of 1 mole of that particular substance and number of grams per mole of a compound.
In other words, the molar mass is the total mass in grams of all the atoms that make up a mole of a specific molecule. As a result, the molar mass units are grams/mole.
The balance chemical equation is as follows :
2 Mg(s) + O2(g) → 2 MgO(s)
The metal Mg reacts with Oxygen in a 2:1 ratio you would divide 2.81 by two.
Now, we get,
2.81 / 2 = 1.405
You would then multiply 1.405 by the molar mass of Oxygen which is 15.999
= 1.405 × 16
= 22.48 g.
Thus, 22.48 g. mass of oxygen combines with 2.81 mol of magnesium in the reaction.
To learn more about the molar mass, follow the link;
https://brainly.com/question/12127540
#SPJ2
Convert 12.04 x 1023 atoms of helium to moles
Moles of Helium = 2
Further explanationGiven
12.04 x 10²³ atoms of helium
Required
moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
moles Helium :
n = N : No
n = 12.04 x 10²³ : 6.02 x 10²³
n = 2
A regional metamorphic belt is divided into zones based upon
Why is biodiversity very important?
Answer: Biodiversity is important to humans for many reasons. ... Ecological life support— biodiversity provides functioning ecosystems that supply oxygen, clean air and water, pollination of plants, pest control, wastewater treatment and many ecosystem services.
Explanation:
HELPPP
i’ll give brainly :)))
Answer:
12. 2.9 g= 0.0029 13. 14.7 L = 14700 ml
14. The chemical formula of magnesium hydroxide is Mg(OH)2, and its molar mass is 58.32 g/mol.
Explanation:
Help please!!! How many grams are in 3.46 moles of Sulfur?
Answer:
The answer is: 78.04454 grams
Explanation:
Answer:
IHi the answer is 32.065 grams
Please help me ASAP
i need help with it please
Answer:
1. cells
2. energy
3. pre-existing cells by division
Explanation:
Answer:
1. All living things have 1 or more cell
2. All organisms use a source of energy
3. All cells come form other pre-exsisting cells
Explanation:
How many boys are in this pedigree?
Answer:
the answer is three 3
......
Select the correct answer.
Which statement best describes how chemical equations demonstrate conservation of mass?
A.
The number of reactants is the same as the number of products.
B.
The compounds are the same on each side of the reaction.
C.
The number of atoms of each element is the same on each side of the equation.
D.
The state of matter is the same on each side of the equation.
Answer:
All of the Above
A.The number of reactants is the same as the number of products.
B.The compounds are the same on each side of the reaction.
C.The number of atoms of each element is the same on each side of the equation.
D.The state of matter is the same on each side of the equation.
Explanation:
Answer:
C
Explanation:
I did the test
What requirements exist for a molecule to be polar?
Answer:
for a molecule to be polar to conditions must be met one we must have at least one polar bond or one lone pair on the central atom to if there are more than one polar bond they must be arranged in a way that their dipoles do not cancel
Why did Mendeleyev try to reorganize the periodic table?
Chem lab report is attached to the question plz help.
Answer: When I opened the doc it didn't work..
Explanation:
True/False: There are about 400 known elements
Answer: false
Explanation:
there are no more then 112 known elements.
Answer:
false
Explanation:
their are only 118 element
PLS HELP ASAP! I WILL GIVE BRAINLIEST!! Which of the following explains the conservation of mass during cellular respiration? (4 points)
a The total number of atoms when carbon dioxide and oxygen react stays the same when glucose and water are produced.
b The total number of atoms when water and oxygen react stays the same when glucose and water are produced.
c The total number of atoms when carbon dioxide and water react stays the same when glucose and oxygen are produced.
d The total number of atoms when glucose and oxygen react stays the same when carbon dioxide and water are produced.
Answer:
jayfeather friend me ccccccc
Explanation:
is: cellular respiration creates an energy molecule when glucose is broken down.
Conservation of mass (mass is never lost or gained in chemical reactions), during chemical reaction no particles are created or destroyed, the atoms are simply rearranged from the reactants to the products.