Answers
1.39 g
the mass of 2.10×10^23
molar mass 40.0 g/mol
The mass of 2.10 x 10²² formula units of NaOH is 1.39 grams.
Mass is defined as a quantitative measure of inertia, a basic feature of all matter.
Mass is also defined as a dimensionless quantity that represents the amount of substance contained in a particle or item.
It can be called as the quantity of substance in any item or body.
The SI unit of mass can be grams or kilograms.
It is a scalar quantity.
Total number of molecule = 2.10 x 10²²
Molar mass = 40.0 g/mole
Number of molecules = mass / malar mass x 6.023 x 10²³
So, Mass = Number of molecule x molar mass / 6.023 x 10²³
Mass = 2.10 x 10²² x 40.0 / 6.023 x 10²³
Mass = 1.39 grams
Thus, the mass of 2.10 x 10^22 formula units of NaOH is 1.39 grams.
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Related Questions
Use the drop-down menus to rank the boiling points of the following hydrocarbons. Use a "1" to indicate the compound with the lowest boiling point. A carbon chain with 5 central carbons, with C H 3 bonded to the first, second, and last carbons in the chain. 2 central carbons with C H 3 bonded to the outside, and C H 3 bonded to the leftmost inside carbon. 2 central carbons, each with C H 3 bonded to them. A central C has H bonded left, above, behind to the right, and in front to the right.
Answers
The ranking of boiling point is based on the molecular weight and intermolecular forces between molecules.
2 central carbons, each with CH3 bonded to them. A central C has H bonded left, above, behind to the right, and in front to the right. A carbon chain with 5 central carbons, with CH3 bonded to the first, second, and last carbons in the chain. 2 central carbons with CH3 bonded to the outside, and CH3 bonded to the leftmost inside carbon.
In this case, all compounds are hydrocarbons, meaning they are non-polar molecules and exhibit van der Waals forces. However, the length of the carbon chain and the arrangement of atoms in the molecule affect the magnitude of these forces.
The first compound has only two carbons and exhibits weak intermolecular forces, so it has the lowest boiling point. The second compound has three carbons and a more complex arrangement of atoms, resulting in slightly stronger van der Waals forces and a higher boiling point.
The third compound has a longer carbon chain, which increases the molecular weight and results in stronger intermolecular forces, giving it a higher boiling point than the previous two. The fourth compound has the longest carbon chain and has multiple branches, which increases the surface area of the molecule and the strength of the intermolecular forces, giving it the highest boiling point.
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Answer:
The answers are 4, 2, 3, 1
Explanation:
calculate the volume i liters of a 3.48g/dl potassium iodide solution that contains 341.g of potassium iodide (KI) round your answer to 3 significant figures
Answers
Answer:
\(V=980L\)
Explanation:
Hello,
In this case, we have a concentration that is per unit of deciliters, therefore, we need to convert it to litre basis:
\(3.48\frac{g}{dL} *\frac{1L}{10dL}=0.348\frac{g}{L}\)
Then, to compute the volume we use the given mass to obtain:
\(V=\frac{341g}{0.348g/L}\\ \\V=980L\)
Best regards.
28. After 3 substances are mixed, an odor emits
a. chemical change
b. physical change
c. thermal energy is used
a do
Answers
Answer:
a. chemical change
Explanation:
A chemical change can cause an odor, however a physical change cannot, and the use of thermal energy will only make an object colder, not give it an odor.
Which expression can be used to calculate the molar mass of an ideal gas? mRT + PV mRT ÷ PV PV ÷ mRT PV × mRT
Answers
Answer
mRT ÷ PV
Explanation
Ideal gas equation is
\(\begin{gathered} PV=nRT \\ \\ Note,\text{ }n=\frac{m}{M};\text{ }where\text{ }m\text{ }is\text{ }the\text{ }mass\text{ }and\text{ }M\text{ }is\text{ }the\text{ }molar\text{ }mass \\ \\ So,PV=\frac{mRT}{M} \\ \\ Cross\text{ }multiply \\ \\ MPV=mRT \\ \\ Diveide\text{ }both\text{ }sides\text{ }by\text{ }PV \\ \\ \frac{MPV}{PV}=\frac{mRT}{PV} \\ \\ M=\frac{mRT}{PV} \\ \\ \Rightarrow M=mRT\div PV \end{gathered}\)Therefore, the expression which can be used to calculate the molar mass of an ideal gas is mRT ÷ PV
Answer:
mRT / PV
Explanation:
just took the test
A solution that is neutral has a pH of:
0
14
10
1
7
Answers
Find the mass in grams of 4.60 x 10^23 atoms
Answers
The mass in grams of 4.60 x 10^23 atoms is approximately 9.17 g.
To find the mass in grams of 4.60 x 10^23 atoms, we need to consider the molar mass and Avogadro's number. Avogadro's number (6.022 x 10^23) represents the number of atoms or molecules in one mole of a substance.
First, we need to determine the molar mass of the substance in question. Let's assume we are dealing with a specific element, such as carbon (C), which has a molar mass of approximately 12.01 g/mol.
To calculate the mass in grams, we can use the following formula:
Mass (in grams) = (Number of atoms / Avogadro's number) x Molar mass
Substituting the given values:
Mass (in grams) = (4.60 x 10^23 atoms / 6.022 x 10^23) x 12.01 g/mol
Calculating the expression:
Mass (in grams) = (0.763 mol) x 12.01 g/mol
Mass (in grams) = 9.17 g
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The nuclei of Three naturally occurring magnesium isotopes have the same number of protons but different numbers of neutrons . Explain Why ? Why does every atom of barium have 56 protons and 56 lectrons? Which subatomic particles in an atom determine its mass number ?
Answers
Based on atomic properties and structure:
Isotopes have the same proton number(atomic number) but different neutron numbers. An atom of barium has 56 protons and 56 neutrons in order to maintain electrical neutrality.The mass number of an atom is determined by the sum of protons and neutrons.What are isotopes?Isotopes are atoms of an element having the same atomic number but different mass numbers.
The difference in mass number is dues to different neutron numbers.
However, because they have the same proton number, they are atoms of the same element.
Neutral atoms contains equal number of protons and electrons.
An atom of barium has 56 protons and 56 neutrons in order to maintain electrical neutrality.
The mass number of an atom is determined by the sum of protons and neutrons.
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At a certain temperature this reaction follows second-order kinetics with a rate constant of 14.1·M−1s−1 : →2SO3g+2SO2gO2g Suppose a vessel contains SO3 at a concentration of 1.44M . Calculate the concentration of SO3 in the vessel 0.240 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits.
Answers
Answer:
\([SO_3]=0.25M\)
Explanation:
Hello there!
In this case, since the integrated rate law for a second-order reaction is:
\([SO_3]=\frac{[SO_3]_0}{1+kt[SO_3]_0}\)
Thus, we plug in the initial concentration, rate constant and elapsed time to obtain:
\([SO_3]=\frac{1.44M}{1+14.1M^{-1}s^{-1}*0.240s*1.44M}\\\\\)
\([SO_3]=0.25M\)
Best regards!
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
Study each picture that depicts the involvement of a particular gland in the endocrine system. Write down the name of the endocrine gland and explain its effect, according to its function.
Answers
The thyroid gland produces and secretes two hormones, thyroxine (T4) and triiodothyronine (T3), which are involved in regulating the body's metabolism.
What is thyroid gland?The thyroid gland is regulated by the pituitary gland, which secretes thyroid-stimulating hormone (TSH). When TSH binds to receptors on the thyroid gland, it stimulates the production and secretion of T4 and T3. These hormones play an important role in the growth and development of the body's tissues and organs, including the brain, heart, and muscles.
What is hyperthyroidism?If there is an overproduction of thyroid hormones, it can lead to hyperthyroidism, which can cause symptoms such as weight loss, nervousness, and rapid heartbeat. On the other hand, an underproduction of thyroid hormones can lead to hypothyroidism, which can cause symptoms such as fatigue, weight gain, and cold intolerance.
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Solar and wind energy are both intermittent resources that cannot be relied upon for a constant stream of energy production. Explain why developing better ways to store energy is an important part of making these energy sources more practical to use.
Answers
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.
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Determine the volume (in liters) of a 0.511-mol sample of helium at 555 mmHg and 513 K.
Answers
Answer: 9084355.951 L if need in correct sig figs answer is
9.08 X 10^6 L
Explanation:
Ideal gas law PV=nRT = V=nrt/P
R= 62.44
n=0.511
T= 513
P= 555
V= 0.511 X 62.44 X 513 / 555
A student made a sketch of a potential energy diagram to represent an endothermic reaction.
A curve line graph is shown. The y axis of the graph has the title Potential Energy and kJ written in parenthesis. The x axis of the graph has the title Reaction Pathway. The curve begins at a higher level and ends at a slightly lower level. A broken horizontal line is shown from a point labelled X on the y axis to the point where the curve begins. Another broken horizontal line is shown from a point labeled Y on the y axis to the point where the curve ends.
Explain, using complete sentences, why the diagram made by the student is correct or incorrect. Be sure to also explain what the values of X and Y represent.
Answers
Based on the description of the potential energy diagram provided, the diagram made by the student appears to be correct.
The potential energy diagram represents the energy changes that occur during a chemical reaction. In an endothermic reaction, the products have higher potential energy than the reactants, meaning energy is absorbed from the surroundings.
The curve line on the graph indicates the energy changes throughout the reaction pathway. It starts at a higher level, representing the initial potential energy of the reactants. As the reaction progresses, the potential energy decreases, indicating the formation of products with lower potential energy.
The broken horizontal line from point X on the y-axis to the point where the curve begins represents the activation energy (Ea) of the reaction. Activation energy is the energy barrier that must be overcome for the reactants to convert into products.
Point X on the y-axis indicates the potential energy of the reactants at the start of the reaction, and the broken line shows the energy required to initiate the reaction.
The broken horizontal line from point Y on the y-axis to the point where the curve ends represents the potential energy of the products. Point Y represents the potential energy of the products at the end of the reaction.
Overall, the student's diagram correctly represents an endothermic reaction, showing the potential energy changes, the activation energy, and the final potential energy of the products. The curve line starts at a higher level (representing the higher potential energy of the reactants) and ends at a slightly lower level (representing the lower potential energy of the products).
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Which of the following statements about subatomic particles are correct? (select all that apply)
A. Neutrons and protons are the only charges subatomic particles
B. The charge on a proton is equal in magnitude and opposite in sign to that of an electron
C. The mass of a proton is similar to that of a neutron
D. The mass of a neutron is slightly greater than that of an electron
Answers
The following statements about subatomic particles are correct:
B. The charge on a proton is equal in magnitude and opposite in sign to that of an electron
C. The mass of a proton is similar to that of a neutron
D. The mass of a neutron is slightly greater than that of an electron.
Subatomic particles refer to the basic building blocks of matter that make up atoms. The main subatomic particles are:
Protons: Positively charge particles found in the nucleus of an atom. The number of protons in an atom determines the atomic number, and thus the identity, of the element.
Neutrons: Neutral particles found in the nucleus of an atom. The number of neutrons in an atom can vary, resulting in isotopes of the same element.
Electrons: Negatively charged particles that orbit the nucleus of an atom. The number of electrons in an atom determines its chemical properties and reactivity.
These subatomic particles interact with each other through electromagnetic forces to form the atoms and molecules that make up matter. Understanding the behavior and interactions of subatomic particles is key to understanding the properties and behavior of matter on a macroscopic scale.
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which elements are nonmetals? (A) Silver, Copper, Zinc, Tin (B) Gallium, Zinc, Sulfur, Chlorine (C) Neon,Sulfur, Iodine, Xenon
Answers
Answer:
neon sulfur iodine xenon
which of the following is a compound?
A)neon
B)water
C)crude oil
D)mud
Answers
Answer:
Water
Explanation:
Water is somehow a compound.
Answer:
mud
Explanation:
mud is made by water and dirt and a compound is 2 things mixed together
In an industrial process ethanol C2H60 burns with O2 to produce heat. Each mole of ethanol produces 8842 joules during the reaction.
C2H5OH (1) + 3 O2(g) 2 CO2(g) + 3 H2O(0) + 8842 Joules
How many Kilojoules are obtained from burning 982.6 g of ethanol?
Answers
Answer:
\(189kJ\)
Explanation:
Hello!
In this case, since one mole of ethanol release 8,842 J per 1 mole of ethanol, we can write:
\(\frac{8,842J}{1molC_2H_6H}\)
Thus, since we need the energy released by 982.6 g of ethanol, we compute the moles in such mass of fuel:
\(n=982.6g\frac{1mol}{46.08g} =21.3mol\)
Therefore, the result is:
\(\frac{8,842J}{1mol}*21.3mol=188,545J\)
Which in kJ is:
\(189kJ\)
Best regards!
A 1.35 m aqueous solution of compound X had a boiling point of
101.4°C. Which one of the following could be compound X? The
boiling point elevation constant for water is 0.52°C/m.
A) CH3CH2OH
B) C6H12O6
C) Na3PO4
D) KCl
E) CaCl2
Answers
When you put it into a table and separate the variables, you'll get 0.80 molecules.
Answer: KCl
That is the correct answer on pearson
Oxygen
Hydrogen
Nitrogen
Carbon
A.
B.
c.
D
Which model represents the chemical formula NO2, nitrogen dioxide?
A)
A
B)
B.
o
C С.
D D
Answers
Answer:
the answer is C
Explanation:
there is 1 purple and 2 blues
The model which represents chemical formula of nitrogen dioxide is C.
What is chemical formula ?Chemical formula is a way of representing information about the proportions of elements which are present in a compound or molecule.It is generally written with the symbols of chemical elements. It also makes use of brackets and subscripts.
Number of atoms of each element is written as a subscript .Chemical formula makes use of no words . It is not the same as structural formula .Chemical formula in the simplest form is called as the empirical formula.
Drawbacks of chemical formula are that they do not provide information about the position of atoms and not also on the structure. Owing to these reasons, chemical formula is not that informative as that of structural formula.
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An empty beaker has a measured mass of 27.234 g. When some salt is added to the beaker, the combined mass is 35.9564 g. Calculate the mass of the salt only (show work), reporting your answer to the correct number of significant figures.
Answers
The mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g
How to calculate mass?According to this question, an empty beaker has a measured mass of 27.234g. However, when some salt is added to the beaker, the combined mass is 35.9564g.
This means that to calculate the mass of the salt in the beaker, we have to subtract the mass of the empty beaker from the combined mass as follows:
mass of salt only = 35.9564g - 27.234g
mass of salt only = 8.7224g
Therefore, the mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g.
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Please I need help thank you
Answers
Answer:
its sodium hydroxide
Explanation:
Doctors are investigating the case of a patient with defective proteins. Which organelle of the cell is most likely the cause?
lysosome
cell membrane
cytoplasm
ribosome
Answers
Answer: lysosome
Explanation:
help which bond has only a sigma bond
Answers
Answer:A
Explanation:
Share a family recipe for a cooking class- marking brainliest
Answers
Answer:
Sopes
In order to make them you will need
1.flour
2.Cheese
3.Lettuce
4. beans
5.tomatoe
How to find molecular mass of ammonia.
Answers
To find the molecular mass of ammonia, we have to know its molecular formula.
The molecular formula of ammonia is NH₃, it means that it contains nitrogen and hydrogen.
To calculate the molecular mass of this compound we have to look for the atomic masses of N and H (you can do it using your periodic table or Internet), once we have them, multiply each atomic mass by the subscript of the element in the molecular formula of the compound. In this case, multiply the atomic mass of N by 1 and the atomic mass of H by 3. Finally, add these products.
The atomic mass of N is 14g/mol and the atomic mass of H is 1g/mol.
Find the molecular mass this way:
\(MM=\frac{14g}{mol}\cdot1+\frac{1g}{mol}\cdot3=\frac{17g}{mol}\)It means that the molecular mass of ammonia is 17g/mol.
The AH° of the reaction is -1367 kJ. Calculate the work done on the system at 25°C. C2H5OH(1) + 302(g) → 2CO2(g) + 3H₂O(0)
Answers
The work done on the system for the reaction \(C2H5OH(1) + 3O2(g) → 2CO2(g) + 3H2O(0)\) at 25°C is 1240 kJ.
The work done on a system can be calculated using the Gibbs free energy equation: \(\beta ΔG = ΔH - TΔS,\) where ΔH is the enthalpy change, T is the temperature, and ΔS is the entropy change. The given enthalpy change is -1367 kJ, which represents the amount of heat released during the reaction.
To calculate the work done on the system at 25°C, we need to calculate the entropy change.
\(ΔS°\)(C₂H₅OH) = 160.7 J/K·mol
ΔS°(O₂) = 205.0 J/K·mol
ΔS°(CO₂) = 213.8 J/K·mol
ΔS°(H₂O) = 188.8 J/K·mol
Using the formula \(ΔS° = ΣnS°(products) - ΣmS°(reactants)\), we can calculate the entropy change for the reaction. This gives:
\(ΔS° = [2(213.8 J/K·mol) + 3(188.8 J/K·mol)] - [1(160.7 J/K·mol) + 1(205.0 J/K·mol) + 3(188.8 J/K·mol)]\)
\(ΔS° = -470.9 J/K·mol\)
Now we can calculate the work done on the system using the Gibbs free energy equation:
\(ΔG = ΔH - TΔS\)
\(ΔG = -1367 kJ - (25°C + 273.15)K × (-0.4709 kJ/K·mol)\)
\(ΔG = -1240 kJ/mol\)
The negative sign indicates that the work is done on the system, and its magnitude is 1240 kJ. Therefore, the work done on the system for the reaction \(C2H5OH(1) + 3O2(g) → 2CO2(g) + 3H2O(0)\) at 25°C is 1240 kJ.
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list three statements for transverse waves
Answers
•Transverse waves are a form of traveling energy
•Transverse waves have oscillations perpendicular to the direction of energy transfer
•Transverse waves have particles that move about their fixed position
Which of the following set of quantum numbers (ordered n, ℓ, mℓ ) are possible for an electron in an atom? Check all that apply
a. 2, 1, 3
b. 5, 3, -3
c. 4, 3, -2
d. -4, 3, 1
e. 2, 1, -2
f. 3, 2, 2
g. 3, 3, 1
Answers
the possible quantum numbers (ordered n, ℓ, mℓ ) are:Option B.5, 3, -3 and Option C. 4, 3, -2
The quantum numbers n, ℓ, mℓ represent respectively the principal quantum number, the orbital angular momentum quantum number and the magnetic quantum number.
These are the three most important quantum numbers. T
here is another quantum number called the spin quantum number, denoted by ms.
Let's see which of the given quantum number sets is possible.2, 1, 3 is not possible because for ℓ = 1, mℓ can only be -1, 0, or 1. 5, 3, -3 is possible.4, 3, -2 is possible. -4, 3, 1 is not possible.
For any value of ℓ, mℓ must be between -ℓ and +ℓ. e. 2, 1, -2 is not possible because for ℓ = 1, mℓ can only be -1, 0, or 1. f. 3, 2, 2 is not possible because for ℓ = 2, mℓ can only be -2, -1, 0, +1, or +2. g. 3, 3, 1 is not possible because for any value of ℓ, mℓ must be between -ℓ and +ℓ.
Therefore, the possible quantum numbers (ordered n, ℓ, mℓ ) are:5, 3, -34, 3, -2
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I don’t know this answer
Answers
The sentences can be completed as follows: For example, when people burn fossil fuels, pollutants can enter the atmosphere and mix with the water vapor that is condensing to form clouds. Runoff carries the water by gravity along the earth's surface.
How to complete the sentencesThe water cycle explains the way in which water continues to be sustained in the earth. First, evaporation takes water on the earth's surface into the atmosphere, after which this is returned to the earth after condensation.
Also, runoffs operate by gravity and can move water along the earth's gravity.
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What is the density of an unknown compound in g/ml if 1.28 pounds of the compound has a volume of 4.50L
Answers
1.28 pounds * 453.59 grams/pound = 580.61 grams
Next, we can use the formula for density:
Density = Mass / Volume
Density = 580.61 grams / 4.50 L
Density = 128.91 g/L
Therefore, the density of the unknown compound is 128.91 g/L or 0.12891 g/mL (since there are 1000 mL in 1 L).