The molar concentration of Na⁺ ions In 0.0200 M solutions of the given sodium salts in water is:
For NaBr, the molar concentration of Na⁺ ions = 0.020 M
For Na₂SO₄; the molar concentration of Na⁺ ions = 0.040 M
For Na₃PO₄; the molar concentration of Na⁺ ions = 0.060 M
What is the molar concentration of a substance?The molar concentration of a substance is the amount in moles of that substance that is present in a given volume of a solution of that substance.
Mathematically;
molar concentration = number of moles of substance / volume of the substanceThe molar concentration of Na⁺ ions In 0.0200 M solutions of the given sodium salts in water is calculated as follows:
Molar concentration = moles of sodium ions in 1 mole of the salt * molar concentration of the salt.
For NaBr;
moles of Na⁺ ions in 1 mole of the salt = 1 mole
molar concentration of Na⁺ ions = 1 * 0.020 M
molar concentration of Na⁺ ions = 0.020 M
For Na₂SO₄;
moles of Na⁺ ions in 1 mole of the salt = 2 moles
molar concentration of Na⁺ ions = 2 * 0.020 M
the molar concentration of Na⁺ ions = 0.040 M
For Na₃PO₄;
moles of Na⁺ ions in 1 mole of the salt = 3 moles
molar concentration of Na⁺ ions = 3 * 0.020 M
the molar concentration of Na⁺ ions = 0.060 M
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Complete question:
What Is The Molar Concentration Of Na+ Ions In 0.0200 M Solutions Of The Following Sodium Salts In Water?
NaBr
Na₂SO₄
Na₃PO₄
Analysis of a sample of hydrated salt shows that it contains 4.86 g Mg, 6.20 g P, 11.20 g O, and 5.40 g H2O. What is the formula of the hydrated salt?
Answer:
Mg₂P₂O₇ · 3 H₂O
Explanation:
(Step 1)
First, you need to convert each mass to moles via the molar masses of each element/compound.
Molar Mass (Mg): 24.305 g/mol
4.86 grams Mg 1 mole
------------------------ x ------------------------ = 0.200 moles Mg
24.305 grams
Molar Mass (P): 30.974 g/mol
6.20 grams P 1 mole
--------------------- x ------------------------ = 0.200 moles P
30.974 grams
Molar Mass (O): 15.998 g/mol
11.20 grams O 1 mole
----------------------- x ----------------------- = 0.700 moles O
15.998 grams
Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol
Molar Mass (H₂O): 18.014 g/mol
5.40 grams H₂O 1 mole
-------------------------- x ----------------------- = 0.300 moles H₂O
18.014 grams
(Step 2)
To find the amount of each element/compound in the formula, you need to divide each molar value by the smallest molar value. This allows you to determine the accurate molar ratio the hydrated salt should have. In this case, 0.200 moles is the smallest value.
0.200 moles Mg / 0.200 = 1 mole Mg
0.200 moles P / 0.200 = 1 mole P
0.700 moles O / 0.200 = 3.5 moles O
0.300 moles H₂O / 0.200 = 1.5 moles H₂O
There can only be whole number amounts of each element/compound in the formula. Therefore, you need to multiply each amount by 2.
1 mole Mg x 2 = 2 moles Mg
1 mole P x 2 = 2 moles P
3.5 moles O x 2 = 7 moles O
1.5 moles H₂O x 2 = 3 moles H₂O
(Step 3)
Now that we know the amount of each element/compound, we can build the formula. The amount of each element is represented by subscripts and the amount of each compound (H₂O) is represented by coefficients.
Mg₂P₂O₇ · 3 H₂O
Atoms are bonded together in a different order in
a. organic compounds.
b. structural isomers.
c. geometric isomers.
d. three-dimensional models.
Answer:
answer.A
Explanation:
that is my answer
Which of the following about the
Lockout/Tagout process are TRUE?
(select all that apply)
Out-of-service equipment may be tagged after being locked out
No training is necessary to perform lockout/tagout procedures
Process to lockout/tagout equipment is always the same
Lockout/Tagout direct wired equipment at energy source
Answer:
Lockout/Tagout direct wired equipment at energy source
Explanation:
The purpose of Lockout Tagout (often referred to as LOTO) is to keep the affected employees in the area from any active energy sources on a machine. The best way to isolate hazardous energy is to isolate it at the energy source to dissipate all hazardous energy that could harm an affected employee.
When 0.20 mol of hydrogen gas and 0.15 mol of iodine gas are heated at 450 °C until equilibrium is established, the equilibrium mixture is found to contain 0.26 mol of hydrogen iodide. The equation for the reaction is as follows
H2((g) + I2(g) ⇋ 2HI(g)
What is the correct expression for the equilibrium constant, Kc?
Answer:
\(Kc=\frac{[HI]^2}{[I_2][H_2]}\)
Explanation:
Hello there!
In this case, for these equilibrium problems it is firstly necessary to know the balanced reaction at equilibrium:
H2((g) + I2(g) ⇋ 2HI(g)
Next, by means of the law of mass action, it turns out possible for us to write the required and correct expression for the equilibrium constant by considering the concentrations and the coefficients in the aforementioned reaction:
\(Kc=\frac{[HI]^2}{[I_2][H_2]}\)
Best regards!
A student is performing an acid-base extraction on unknown compounds, and she extracts the organic layer with 5% HCl solution and separates off the aqueous layer. She then adds sodium hydroxide solution to the aqueous layer and observes a white precipitate. Which of the following functional group(s) is most likely in the precipitated compound?
a. ether
b. amine
c. carboxylic acid
d. ester
Answer:
amine
Explanation:
We have to bear in mind that amines are basic compounds. This idea will be very important in attempting to answer this question.
So, when she adds 5% HCl solution in order to extract the organic layer, the amine forms a hydrochloride salt which is contained in the aqueous layer.
The addition of a base such as NaOH leads to the formation of a white precipitate of the amine.
Aglae are aquatic organisms that use water, carbon dioxide, and sunlight to provide their own Energy Systems need to consume energy by eating algae and other organisms which of the following statements describe fish and algae? A- fish are autotrophs and aglae are heterotrophs B- fish and aglae are both heterotrophs C- fish and algae are both autotrophs D- fish are heterotrophs and aglae are autotrophs
Answer:
D
Explanation:
Algae produces their own energy through photosynthesis, making them autotrophs. Fish have to consume energy by eating other organisms making them heterotrophs.
methods used to reduce a sample to manageable size
Reduce Alpha Level to 10%
Reduce Statistical Power to 70%
Add an extra ARM (to a crossover study)
Use paired tests instead of independent tests.
PROBLEM SOLVING: Show pertinent solution and underline/put in a box your final answer. Use the space provided. 15 pts
1. Balance the ff skeleton reactions and identify the oxidizing and reducing agents: 6 pts
a) O2(g) + NO(g) + H2O(l) → NO3-(aq) + H+(aq)
b) CrO42–(aq) + H2O(l) + Cu(s) → Cr(OH)3(s) + Cu(OH)2(s) + OH–(aq)
2. A cell can be prepared from copper and tin. What is the E°cell for the cell that forms from the
following half-reactions? 3 pts
Cu2+(aq) + 2e- Cu(s); E° = 0.34 V Sn4+(aq) + 2e- Sn2+(aq); E° = 0.13 V
Based on the redox equations;
O2 is the oxidizing agent while NO is the reducing agentCu is the reducing agent while CrO_4{^2} is the oxidizing agentThe emf of the cell, E°cell of the cells formed from the half-reactions is 0.21 V
What are reducing and oxidizing agents?Reducing agents are substances which donates electrons and are oxidized in a redox reaction.
Oxidizing agents are substances which accept electrons and are reduced in a redox reaction.
From the given the redox equations:
a) O_2(g) + NO(g) + H_2O(l) → NO_3^{-}(aq) + H^{+}(aq)
O_2 is the oxidizing agent while NO is the reducing agent.b) CrO_4^{2-}(aq) + H_2O(l) + Cu(s) → Cr(OH)_3(s) + Cu(OH)_2(s) + OH^{-}(aq)
Cu is the reducing agent while CrO_4^{2-} is the oxidizing agent.2. The emf of the cell, E°cell = E°red - E°oxi
In the cell, copper is reduced while tin is oxidized.
E°cell = (0.34 - 0.13) V
E°cell = 0.21 V
Therefore, the emf of the cell, E°cell is 0.21 V
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Please help me do this
The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.
a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.
Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂
Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:
Volume of CO₂ = Volume of balloon = 765 L (at STP)
Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP
= 765 L / 22.4 L/mol
= 34.15 mol
Mass of CO₂ = 34.15 mol x 44.01 g/mol
= 1501.17 g
Total mass of balloon and its content = 20 g + 1501.17 g
= 1521.17 g
b) Number of moles of CO₂ in the balloon is 34.15 mol
c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).
Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number
= 34.15 mol x 6.02 x 10²³ molecules/mol
= 2.06 x 10²⁵ molecules
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PLS help ill mark you as brainlist
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa ) to about 60,000 kPa (60,000,000 Pa ). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 2.09×108 Pa, what is its running pressure in torr?
Express the pressure numerically in torr.
The running pressure of the HPLC procedure in torr is approximately 2068.2687 torr.
What is Chromatography?
Chromatography is a technique used to separate, identify, and analyze the components of a mixture based on their differential affinities to a stationary phase and a mobile phase. It is widely used in chemistry, biochemistry, pharmaceuticals, environmental science, forensics, and other fields for purification, separation, and analysis of chemical compounds.
To convert pressure from pascals (Pa) to torr, we can use the following conversion:
1 torr = 101325 Pa
So, to convert the pressure from pascals to torr, we can divide the pressure in pascals by 101325.
Given:
Pressure in pascals (Pa) = 2.09 × \(10^{8}\) Pa
Using the conversion factor:
Pressure in torr = (2.09 × \(10^{8}\)Pa) / 101325 Pa/torr
Calculating the numerical value in torr:
Pressure in torr = 2068.2687 torr (rounded to four decimal places)
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PLEASE HELP ME!!! When two atoms combine to form a compound, one atom pulls electrons from the other atom towards itself. The atom that pulls electrons is (reduced or oxidized). The atom whose electrons are being pulled is (reduced or oxidized)?
Answer:
The pulling atom is oxidized while the pulled atom is reduced. Grade 9 Chemistry
Explanation:
When studying evolution, the term "isolation" means one ______.
In evolution, isolation means one group is separated and isolated from a population to study the adaption of evolutionary changes over a period of time.
A natural phenomenon called evolution describes how inheritable traits of a species alter through time.
Natural selection, mutation, genetic drift, and migration are the key drivers. Geographical or reproductive isolation stop the exchange of genetic material across populations. As a consequence of adaptation to a particular environment or niche throughout time, populations of many species changed (natural selection).
When there is a barrier that the creatures can't overcome, they become isolated, which implies they are separated from other members of their species. The isolation of organisms is a consequence of environmental change. When mountain ranges or deserts emerge or when continents separate, isolation may develop gradually.
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WHERE can you find the formula for density?
Answer:
The formula for density is mass divided by volume
Explanation:
hope this helps!!!
Water moves on, above or under the surface of the Earth true or false
above because its above
Sometimes a simple incident in our lives can actually have a deeper meaning and impact on us than might be apparent at the time. Write a reflective narrative about a memorable experience in your life.
In English, you're asked to write a reflective narrative about a life event with a deeper impact than initially visible. Describe the event, your reaction, its deeper meaning, and how it shaped you.
Explanation:This question pertains to reflective writing, a style typically used in English subject coursework. The task is about developing a narrative based on a memorable experience in your life that had a deeper impact than initially visible. Begin by selecting an event, which while appearing simple, had profound implications in retrospect. Describe the event in detail (who, what, where, when), discussing your personal reaction at the time. Then, explain its deeper meaning or the impact it had on you. Drawing conclusions about how this event shaped your perspectives or behaviours would constitute the reflective element of your narrative.
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explain the variation of basicity in group III A members down the group
Answer:
Explained below
Explanation:
Group 3A elements are made up of the metalloid - boron (B) and other metals such as Aluminum (Al), gallium (Ga), indium (In), & thallium (Tl).
Now, as we go down the group, the size of the central atom will increase thereby causing the lone pair to become delocalized over a larger volume space. Thus, it's not readily available for donation and thus basicity increases
Scientists classify rocks mainly according to which feature?
their color
how they form
their hardness
where they are found
Calculate the volume of hydrogen if you have 12.1 moles of Hydrogen.
To Find :
The volume of 12.1 moles hydrogen at STP.
Solution :
We know at STP, 1 mole of gas any gas occupy a volume of 22.4 L.
Let, volume of 12.1 moles of hydrogen is x.
So, x = 22.4 × 12.1 L
x = 271.04 L
Therefore, the volume of hydrogen gas at STP is 271.04 L.
How many resonance structures does the sulfur dioxide molecule have?
Sulphur dioxide molecule have two resonance structure.
Resonance structures are the different Lewis structures of the same molecule. The components of the molecule will change places from one another.
The two resonance structures of sulphur dioxide molecule is demonstrated here.
A third Lewis structure can also be drawn. But that is not a stable molecule in reality and can't be counted.
To solve this, we must be knowing each and every concept related to resonance. Therefore, there are total two resonance structure of sulfur dioxide molecule.
What is resonance?Resonance is a technique for characterizing delocalized electrons in molecule in which the bonding cannot be described directly by a singular Lewis structure. It is also called mesomerism.
Each unique Lewis structure of the targeted molecule or ion is referred to as a contributing structure. Because they simply differ in the location of delocalized electrons, contributing structures really aren't isomers of the targeted molecule or ion. There are total two resonance structure of sulfur dioxide molecule.
Therefore, there are total two resonance structure of sulfur dioxide molecule.
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someone on this planet please help me with this vocab
Answer:
1 - concentrated solution
2- dilute solution
3- solubility
4- saturated solution
5- supersaturated solution
6- unsaturated solution
7- acid
8- base
9- corrosive
10- indicator
Explanation:
glucose is a six carbon sugar. Albumin is a protein with 607 amino acids. the average molecular weight of a single amino acid is 135 g/mol. there is no reason to run these solutes at the 20 MWCO because
There is no reason to run these solutes at the 20 MWCO because they are both much smaller than the MWCO of the membrane.
The MWCO (molecular weight cut off) is the molecular weight of a solute at which it will be retained by a membrane during a process such as ultrafiltration or dialysis. If a solute has a molecular weight higher than the MWCO of a membrane, it will be retained and not pass through the membrane. If the molecular weight of a solute is lower than the MWCO, it will pass through the membrane.
In this case, glucose has a molecular weight of 180 g/mol (6 carbons x 12 g/mol per carbon + 6 oxygens x 16 g/mol per oxygen) and albumin has a molecular weight of approximately 81,942 g/mol (607 amino acids x 135 g/mol per amino acid). Both of these solutes have molecular weights that are much lower than 20,000 g/mol, which is a typical MWCO for ultrafiltration or dialysis membranes.
They would both easily pass through the membrane and be lost during the process. Instead, a membrane with a much lower MWCO would be needed if we wanted to retain these solutes during a process such as ultrafiltration or dialysis.
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Given that oxygen -16 and oxygen -18 both havean atomic number of 8, how many electrons, protons and neutrons do these oxygen atoms contain
Oxygen-16: 8 protons, 8 neutrons, 8 electrons
Oxygen-18: 8 protons, 10 neutrons, 8 electrons
Explanation:Using atomic and mass numbers, we can find information about the makeup of atoms.
Protons
Every element has a unique number of protons, and every atom of the same element will have the same number of protons. This means that both oxygen atoms must have the same number of protons. The number of protons in an element is equal to its atomic number. Since oxygen has an atomic number of 8, all oxygen atoms will have 8 protons. This means that oxygen-16 and oxygen-18 have 8 protons.
Neutrons
The number of neutrons an atom of a certain element can have varies. Atoms of the same element that have different numbers of neutrons are known as isotopes. The number of neutrons can be found through the mass number. The mass number is the number that follows the dash in the name of the isotope. This number is equal to the protons plus the neutrons. So, to find the number of neutrons in an oxygen atom, subtract 8 protons from the mass number. This means oxygen-16 has 8 neutrons and oxygen-18 has 10 neutrons.
Electrons
Remember that electrons are negatively charged, protons are positively charged, and neutrons have no charge. The number of electrons in an atom determines the charge of the atom. If the number of electrons equals the number of protons, then the charge of the atom will equal 0. If there are more electrons, then the atom will be negatively charged and vice versa. Since neither of the atoms has any indication of a nonzero charge, the number of electrons must equal the number of protons. So, both oxygen atoms have 8 electrons.
7. Calculate moles of H2 needed to form 2.25 moles HCl in the reaction H2 + Cl2==>2HCl
Answer:
1.125 moles
Explanation:
2mole of HCl produced 1mole of H2
2.25moles of HCl will produce x moles
cross multiply
2x=™1×2.25
x= 2.25÷2
x=1.125mole
1. Write the IUPAC names for the following 1.1 1.2 N 1.3 O NO2 x Y ·0 OH 5
1. The IUPAC name of N is nitrogen.
2. Nitrogen dioxide
3.The IUPAC name of O is oxygen
4.The IUPAC name of OH is hydroxyl.
The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.
IUPAC names for the given compounds are:1.1. N: Nitrogen
The IUPAC name of N is nitrogen.
It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide
Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.
The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen
Explanation: The IUPAC name of O is oxygen.
It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.
X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.
Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.
It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.
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Note: The complete question is given below
Provide the IUPAC names for the following compounds:
\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)
C6H5CH(CH3)2
H2NCH2CH2CH2CH2CH2NH2
CH3CH2CH2CH2CH2OH
CH3CH2CH2CHOHCH3
Baking soda (NaHCO3, 84.0 g/mol) requires acids from other ingredients to generate the carbon dioxide needed to make bread rise. The following equation describes this reaction, where HB is some unspecified acid. If 20.4 g of baking soda are used in a recipe and enough acid is present for a complete reaction, how many moles of carbon dioxide are generated?
HB + NaHCO3 ⟶ H2O + CO2 + NaB
a. 0.243 mol
b. 0.204 mol
c. 0.334 mol
d. 0.232 mol
e. 0.464 mol
How many moles is 11 grams of H2O
Answer to the nearest 0.01 moles.
Answer:
hope your having a blessed day
Explanation:
Explanation:
We know :-
Molecular mass of H2O = 18 u
Molar mass = 18 g
Then no of moles = Mass given ÷ Molar mass
= 11 ÷ 18
= 0.611111..
or = 0.61
Calculate the number of atoms in a 3.31 x 10 g sample of lithium.
g
Explanation:
atomic mass of Li = 7 amu
so we know that there are about (33.1)/7 = 0.47 mol
Multiply this by 6.02 * 10^23 particles per mol, and we get about 2.83 * 10^23 particles
6.How many molecules of carbon dioxide are in 400 grams of the substance?
Answer: 5.47x10^24 molecules
Explanation:
6.02214076x10^23 molecules CO2 = 44g
400g = (400/44)*6.02214076*10^23 = 5.47x10^24
According to the concept of Avogadro's number, there are 54.75 ×10²³ molecules of carbon dioxide are 400 grams of the substance.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number .Number of moles= 400/44=9.09 moles which is number of molecules =9.09×6.023×10²³= 54.75 ×10²³ .
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Which water usage uses the least amount of water in a year in the United States? a industry
b livestock c irrigation d public water supply
plzzzzzzzz hurrrrry
I need help identifying the bonds in each molecule as a polar or nonplolar
Polar molecule : \(NH_{3} , HF, H_{2}O, CH_{3}F.\)
Non Polar Molecules : \(CH_{4}, BeCl_2\)
What is the difference of nonpolar and Polar Molecules?We refer to something as being polar when it differs at either end. Some molecules also contain positive and negative ends; these are known as polar molecules. Polar objects can both attract and repel one another (opposite charges attract, alike charges repel).It is frequently helpful to look at Lewis structures to establish whether a molecule is polar or nonpolar. Nonpolar compounds are said to be symmetric, which means that all of the sides surrounding the core atom are the same and bound to the same element without any unshared pairs of electrons.To learn more about : Lewis structures
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