It measure the number of elementary entities of a given substance that are present in a given sample. 1.99 moles of glucose are present in 1.2 x 10²⁴ molecules.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. The stoichiometry represents the number of moles. Mole is directly proportional to the number of given molecules.
Given number of atoms= 3.01x10²³atoms
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
mole of glucose =given number of molecules of glucose ÷ 6.022×10²³(Avogadro number)
Substituting the values, we get
mole of glucose= 1.2 x 10²⁴÷6.02 x 10²³
mole of glucose= 1.99 moles
Therefore, 1.99 moles of glucose are present in 1.2 x 10²⁴ molecules.
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The student collects the H2 (g) produced by the reaction and measures the volume
The question is incomplete, the complete question is;
The student collects the H2(g) produced by the reaction and measures its volume over water at 298 K after carefully equalizing the water levels inside and outside the gas-collection tube, as shown in the diagram below. The volume is measured to be 45.6mL . The atmospheric pressure in the lab is measured as 765 torr , and the equilibrium vapor pressure of water at 298 K is 24 torr .(i) The pressure inside the tube due to the H2(g)
Answer:
741 torr
Explanation:
From the question we can see that the atmospheric pressure in the lab is 765 torr.
The vapour pressure of water = 24 torr
From Dalton's law of partial pressure, we know that;
Total pressure = Pressure of the H2 + Partial pressure of water vapour
Therefore;
Pressure of H2 = Total pressure - Partial pressure of water vapour
Pressure of H2 = 765 torr - 24 torr = 741 torr
Answer Fast Please!!!
Which of the following statements is true?
The Periodic Table is organized in order of atomic number.
Substances in a mixture lose their unique properties.
Elements in the same period have similar properties.
Heterogenous mixtures are also called solutions.
Answer:
I believe it is A. The Periodic Table is organized in order of atomic number.
Explanation:
2 eggs cook in a frying pan, which is sitting over a gas burner. Is thermal energy being transferred by radiation in this image? Why or why not?
Sample Response: No, thermal energy is not being transferred by radiation in this image. The eggs are in direct contact with the metal pan, which is in direct contact with the gas flame, so this is conduction, not radiation. Radiation transfers thermal energy by electromagnetic waves, not by direct contact.
Explanation:
No, thermal energy is not being transferred by radiation in this image.
The eggs are in direct contact with the metal pan, which is in direct contact with the gas flame.
Thermal energy is being transferred by conduction.
Radiation transfers thermal energy by electromagnetic waves.
Radiation does not transfer thermal energy by direct contact.
Thermal energy is the heat energy that is produced with an increase in temperature. No, thermal energy is not transferred by radiation when eggs are cooked.
What is radiation?Radiation is the process of thermal energy transfer that emits heat in all directions and does not require an intervening medium to travel.
Thermal energy is not transferred by radiation in the image as the eggs are in contact with the pan and the pan is in direct contact with a flame that radiates the heat by conduction.
Therefore, heat transfers by conduction and not by radiation.
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Can someone help? I don’t understand at all
Na = 2 atoms
Cl = 2atoms
F = 2 atoms
Further explanationGiven
Skeleton equation(unbalanced equation) :
NaCl+F2⇒NaF+Cl2
Required
The number of atoms
Solution
We balance the reactions to find the reaction coefficient, which is then used to calculate the number of atoms in the reactants and products
Balanced equation
2NaCl + F2 → 2NaF + Cl2
A balanced reaction will show that the number of atoms in the reactants and products is the same
Reactants :Na = 2 atoms
Cl = 2atoms
F = 2 atoms
Products :Na = 2 atoms
F = 2 atoms
Cl = 2 atoms
How many grams are there in a 0.127 mole sample of H2O?
Answer:
2.28794056 grams
I hope this helps
HELPPPP DUE NOWWW (5)
Answer:
All the answers you chose are correct
Explanation:
Answer:
I cant see the fist question but all that you chose are correct
Explanation:
8. Which of the following uses photos thesis to make food
a shark
tomato plant
A human
A cow
Answer:
A tomato plant use photosynthesis to make food
Explanation:
Help please!!! What is the mass of 9.25 moles of Mn203?
Answer:
0.05859091769326505 moles Mn203
Explanation:
I need help...................
a. What is the mass of 3.47x10^26 molecules of CuCl2?
Answer:
77460 g
Explanation:
To solve this problem first we convert molecules into moles, using Avogadro's number:
3.47x10²⁶ molecules ÷ 6.023x10²³ molecules/mol = 576.12 moles
Then we convert 576.12 CuCl₂ moles into grams, using its molar mass:
576.12 mol * 134.45 g/mol = 77460 g
So the answer is 77460 g, or 77.46 kg.
which three human body systems coordinate to cause the arm to move
Answer:
Nervous system, Cardiac system, and the muscluar system
Explanation:
When a chemical reaction does not occur, what happens to the atoms of the two substances?
please make it sound like a 7th grdaer would say! <3
Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Explanation:
consider marking me brainlist :)
HELP PLEASE IM GIVING BRAINLIST What is density?
Question 1 options:
the amount per unit volume of a particular material
the weight of water
a measure of salinity
the amount of salt in water
Answer:
The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume.
Explanation:
boom hope it helps
Answer:
the amount per unit volume of a particular material is the answer!
Explanation:
Which of the following would happen if Earth's moon were half the size that it is now? O The oceans' tidal variations would be smaller because the Moon would exert less gravitational pull on Earth's oceans. O The oceans' tidal variations would be greater because the Moon would exert less gravitational pull on Earth's oceans. O The oceans' tidal variations would be greater because the Moon would exert more gravitational pull on Earth's oceans. The oceans' tidal variations would be smaller because the Moon would exert more gravitational pull on Earth's oceans. & Previous
Answer: A. The oceans‘ tidal would be smaller because the moon would exert less gravitational pull on earths oceans.
Explanation:
i got it right :)
true or false electrical energy is the amount of energy that contains an object due to the kinetic energy?
The answer to this question would be true.
how many atoms are in 7.3 moles of arsenic atoms? 1 mol = 6.02 x 10^23 particles
Answer:
6,9
Explanation:
What does the model represent
If you took a wire, connected one end to a rechargeable battery, and connected the other end to the leaf of a plant, would you be able to extract electricity from the plant ?
Answer:
No bcz it is insulator it will not conduct electric
why might genetically identical twins have different phenotype
Answer:
They may have different phenotypes because of differences in their environments, such as nutrition and healthcare. Why might genetically identical twins have different phenotypes? Any genes on the same chromosome could be linked genes, whereas only genes on sex chromosomes can be sex-linked genes.
Explanation:
Due to the effects of the environment, genetically identical twins might have different phenotype.
What is phenotype?The qualities or visible characteristics of an organism are its phenotype. It depends on how the environment and the genotype, or genetic code, of the organism interact.
Although human monozygotic twins as well as other genetically identical species may share startling physical similarities, they frequently differ in key characteristics, such as complicated diseases. The effects of the environment have generally been blamed for this variance across organisms with essentially identical chromosomal DNA sequences.
Therefore, due to the effects of the environment, genetically identical twins might have different phenotype.
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is a cellphone made from renewable resources *
Answer:
Mobiles are made from many non-renewable materials which have been extracted from the earth – such as: Metals. Plastics.
Explanation:
Answer: they are made from many metals,plastics. etc...
Explanation:
they also aren't bio-degradeable so they're also harmful for the environment.
HELP! IM GIVING BRAINLIST.What is salinity?
Question 1 options:
The concentration of dissolved salt in a liquid
to become incorporated with a liquid in forming a solution
a liquid mixture in which the smaller component (solute) is distributed evenly through the major component (solvent)
Answer:eighter a b or c
nah i am playing it is a
Explanation:
Answer:
A is correct i took the quiz
Explanation:
Balance the equation
AgBr +
GaPO4 →
Ag3PO4 +
GaBi3
Answer:
3AgBr + GaPO4 ----> Ag3PO4 + GaBr3Explanation:
Which of these is NOT a science and engineering practice?
asking questions
opinion and factless ideas
analyzing and interpreting data
obtaining, evaluating, and communicating information
Opinion and and factless ideas are not science and engineering practice as these are based on observations.
What are observations?
Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.
It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.
It is important to note down observations so that the testing of hypothesis is made easier.There are four types of observations .Observations need to be descriptive and must be written in complete sentences and should include all the numerical data of the experiment.
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If two people have sex in certain positions then pregnancy is not possible because of gravity
Answer:
true <3
Explanation:
How many moles are equal to 8.9 x 10^24 formula units of CO2?
Answer:
15 moles of CO₂
Explanation:
Given data:
Number of formula units = 8.9 ×10²⁴ formula units
Number of moles of CO₂ = ?
Solution:
The given problem will solve by using Avogadro number.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ formula units
8.9 ×10²⁴ formula units × 1mol / 6.022 × 10²³ formula units
1.5 mol ×10¹ mol
15 moles
If the spring constant is 12.6N/m and a spring is stretched by 0.25m, how much force has been applied?
Answer:
3.15N
Explanation:
We use this equation:
F= k∆x
Where ∆x refers to the amount or stretch or compression and k is the spring constant.
F = force
k = spring constant
∆x = change in length of spring
To find the value of F:
F= k∆x
F= 12.6x0.25
F= 3.15N
how to titrate cocacola because of its dark colour
Answer:
add baking soda maybe
Explanation:
Answer and Explanation
__________________________________________________________
All of the Information below is not owned by me, it is owned by CCBCMD.
__________________________________________________________
Colas are also carbonated beverages. The carbonation can produce some carbonic acid in the Cola, which would affect your results. Therefore, to ensure that you are only titrating the phosphoric acid you will use de-carbonated soda. This can easily be obtained by gently heating the soda, or as you may already know, by rapidly shaking the bottle. It is also important that we do not use diet Colas since the artificial sweeteners that they contain have acidic functional groups that will also interfere with the titration.
__________________________________________________________
1Use a 25.00-mL pipet to deliver exactly 25.00 mL of room temperature, de-carbonated
Cola into a 250-mL beaker. Check out a magnetic stir bar and gently add it to the
beaker. Place the beaker on a stir plate. Set up a pH meter so that the probe is completely immersed, but in a way that the stir bar will not hit it. The tip of the probe
has a thin glass membrane. Handle it with care! Position the beaker so that the stir bar
is as close to the center of the beaker as possible for optimal stirring. It should stir
rapidly enough to ensure thorough mixing but not so rapidly as to cause splattering.
__________________________________________________________
2Obtain about 75 mL of 0.0100 M NaOH in a beaker. Use this NaOH to fill a buret.
Remember that you should always rinse a buret 2-3 times with the solution that you are
about to put into it and remove air bubbles at the buret tip. If you do not remember how
The initial level of the NaOH should be at exactly
0.00 mL. Once the buret is ready, place it over the beaker containing the Cola
__________________________________________________________
Hope this helps! <3
__________________________________________________________
Plz help me on this
A student has a 6 gram sample of sodium chloride (NaCl) solid. How many moles of sodium chloride are contained in this sample?
The number of moles of NaCl = 0.103
Further explanationGiven
6 gram sample of NaCl
Required
moles
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
mole = mass : molar mass
Molar mass of NaCl = 58.5 g/mol
Input the value :
mole = 6 g : 58.5 g/mol
mole = 0.103
HELP ASAP
Based on the image shown, write the number that
corresponds to the term or phrase. Assume that
the electrons flow counterclockwise from 3 to 2 to
1, from 5 to 4 to 5, and to 3.
3, 1, 5, 4, 3, spontaneous
The area of a telescope lens is 6.668 × 103 mm2. What is the area in square feet (ft2)? Enter your answer in scientific notation
Answer:
[tex]7.13\times 10^{-2}\ ft^2[/tex]
Explanation:
The area of a telescope lens is 6.668 × 10³ mm²
We need to convert the area in ft².
We know that,
[tex]1\ mm^2=1.07\times 10^{-5}\ ft^2[/tex]
It means,
[tex]6.668 \times 10^3\ mm^2=6.668 \times 10^3\times 1.07\times 10^{-5}\ ft^2\\\\=0.0713\ ft^2[/tex]
or
[tex]0.0713\ ft^2=7.13\times 10^{-2}\ ft^2[/tex]
So, the required answer is [tex]7.13\times 10^{-2}\ ft^2[/tex].