We are required to calculate the molarity, given:
Volume = 150 mL = 0.150 L
mass of KOH = 25.0 g
Formular for molarity:
C = n/V
Before we can get C, we need to calculate n, the number of moles of KOH.
n = m/M where m is the mass and M is the molar mass
n = 25.0 g/56,1056 g/mol
n = 0.446 mol
Now we can calculate C, the molarity
C = 0.446 mol/0.150L
C = 2.97 mol/L or 2.97 M
In the ammonia tube, the colour changed in 34s. Estimate approximately how long it took for the indicator paper in the HCI tube to change colour. Choose your answer (A-D) and give a reason.
A 34s
B100s
C 50s
D 25s
The time taken by the indicator paper in the HCI tube to change color is 25s because it is acidic in nature. Thus option D is correct.
What is indicator?Indicator is defined as a chemical substance that changes color when an acid or base is present.
It can also be defined as any substance that indicates visibly the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution, typically through a color change.
Indicator paper is defined as a piece of colored paper with a strip that turns red in acidic solutions and blue in basic ones.
There are mainly four types of indicator.
Input indicatorProcess and output indicatorOutcome indicatorImpact indicatorThere are several indicators that are frequently used in laboratories, including litmus, phenolphthalein, and methyl orange.
Thus, the time taken by the indicator paper in the HCI tube to change color is 25s because it is acidic in nature. Thus option D is correct.
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Which compounds have the same empirical formula?
The compounds that have the same empirical formula in the model are A B C.
What is the empirical formula?The empirical formula is the formula that shows the ration of the atoms that we have in a compound. We know that, the empirical formula can be said to be the simplest formula of the compound. The structural formula is the formula that shows the arrangement of the atoms that are in a compound. The molecular formula shows the number of atoms that we have in a compound.
Now, we can try to label the models as they appear from left to right. Let us give them the labels A B C D. If we look at them, we can notice that A B C have the same two blue colors and one red color. Let bus recall that these colors show us the ratio of each of the atoms that are present in the compound as is clear from the image attached to the question.
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Calculate the percent yield of HF in a reaction that had a theoretical yield of 12.79g and an actual yield of 10.41g. Round your answer to the correct number of sig figs
The question requires us to calculate the percent yield of HF in a reaction, given its actual yield (10.41g) and theoretical yield (12.79g).
The percent yield of a chemical process can be calculated as:
[tex]\%yield=\frac{actual\text{ yield (g)}}{\text{theoretical yield (g)}}\times100\%[/tex]Thus, applying the values given by the question, we can calculate the percent yield of HF:
[tex]\%yield=\frac{10.41g}{12.79g}\times100\%=81.39\%[/tex]Therefore, the percent yield in the reaction mentioned is 81.39%. Note that the question provided values with four significant figures, thus our answer must also present four significant figures.
What type of bond would you predict to be formed between elements E and G?
Ionic bonds are formed between a metal and non metal. The bond formed between E having atomic number 19 and G with atomic number 17 is ionic bond.
What is ionic bonding?
Ionic bonds are strong bonds formed between a metal and non metal. Ionic bond is generated by donation of one or more electron from metal to the non metal.
Metals are electropositive and non-metals with high electronegativity are bind by by an electrostatic force of attraction through bonded electrons where the bonded electrons are pulled towards the electronegative atom.
The element G with atomic number 17 is chlorine. Which is 17th group element and is highly electronegative. Chlorine have a valency of one and by accepting one electron from a metal it completes its octet.
Element E with atomic number 19 is potassium or K. Potassium is an electropositive element with a valency of one and it donates one electron to an electronegative atom to become stable.
Therefore, the bond formed between potassium and chlorine is ionic bond formed by donation of an electron from K to Cl making the compound KCl.
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Your question is incomplete. But most probably your complete question was:
There are three elements E , F , G with atomic number 19 , 8 and 17 respectively. What type of bond would you predict to be formed between elements E and G?
Refer to instructions. (S)-(-)-Serine:
a. is dextrorotatory
b. rotates plane-polarized light in a counterclockwise direction
c. rotates plane-polarized light in a clockwise direction
d. is racemic
7. Refer to instructions. Draw the enantiomer of (S)-()-serine in a wedge-dash projection.
An amino acid involved in the production of proteins is serine. It is a polar amino acid because it has a -amino group, a carboxyl group, and a side chain made up of a hydroxymethyl group.
A crucial part of plant metabolism, growth, and cell signaling is played by the polar amino acid serine. Serine contributes to the formation of biomolecules like amino acids, nucleotides, phospholipids, and sphingolipids in addition to serving as a protein building component.
Wedge-dash structure refers to the portrayal of an organic compound that shows its 3-D structure. The inside and outward groups are denoted by dash-bond and wedge-bond, respectively.
Typically, a wedge-bond will be used to represent the group on the left side of the Fischer projection and a dash-bond will be used to represent the group on the right side. The H atom will be joined to the dash-bond and the methyl group will be joined to the wedge-bond.
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A sample contains 1.3 moles of carbon, 10.4 moles of hydrogen, and 10.4 moles ofoxygen. Find the empirical formula. What is the subscript for oxygen?Hint 1: The only thing you should put in the blank below is the number that is thesubscript for oxygen in the correct empirical formula.Hint 2: This is basically just the very last part of your finding empirical formulas frompercent composition problems.
8
Explanations:The empirical formula of a compound is defined as the simple whole ratio of atoms present in a compound.
Given the following parameters
• Moles of carbon = 1.3 moles
,• Moles of hydrogen = 10.4 moles
,• Moles of Oxygen = 10.4 moles
Calculate the simple whole ratio of each atom by dividing the mole number by the smallest mole value:
[tex]\begin{gathered} \text{For C: }\frac{1.3moles}{1.3}=1.0 \\ \text{For Hydrogen: }\frac{10.4moles}{1.3}=8.0 \\ \text{For Oxygen: }\frac{10.4moles}{1.3}=8.0 \end{gathered}[/tex]Determine the empirical formula:
[tex]C_{}H_8O_8[/tex]From the resulting empirical formula, the subscript for oxygen in the correct empirical formula is 8.
Aqueous potassium iodate (KIO g) and potassium iodide (KI) react in the presence of dilute hydrochloric acid, as shown below.KI0 3( aq) + 5K|( ag) + 6HCI( ag) -› 31 2(ag) + 6KC|(aq) + 3H 20(1)What mass of iodine (I 2) is formed when 50.0 mL of 0.020 M KIO g solution reacts with an excess of KI and HCl?
The reaction is balanced, so we can continue with the calculations.
We will first find the moles present in the KIO3 solution. For this we are going to use the molarity equation that tells us:
[tex]Molarity=\frac{MolesSolute}{Lsolution}[/tex]We solve the moles of solute from the equation:
[tex]\begin{gathered} MolesSolute=Molarity\times Lsolution \\ MolesSolute=0.020M\times50.0mL\times\frac{1L}{1000mL} \\ MolesSolute=0.001molKIO_3 \end{gathered}[/tex]Now, they tell us that the rest of the reactant is in excess. therefore, the calculations will be made based on the moles of KIO3. By stoichiometry, we have that the I2 to KIO3 ratio is 3/1. So the moles of I2 formed will be:
[tex]\begin{gathered} molI_2=givenmolKIO_3\times\frac{3molI_2}{1molKIO_3} \\ molI_2=0.001molKIO_3\times\frac{3molI_{2}}{1molKIO_{3}}=0.003molI_2 \end{gathered}[/tex]Now, the mass of I2 will be:
[tex]\begin{gathered} gI_2=givenmolI_2\times\frac{MolarMass,gI_2}{1molI_2} \\ gI_2=0.003molI_2\times\frac{253.8gI_2}{1molI_2}=0.76gI_2 \end{gathered}[/tex]Answer: The mass of iodine formed is 0.76 g I2. Second option
what information is necessary to review in order to be considered familiar with the safety data sheet (sds) of a substance?
Personal protection and first aid recommendations Identification and description of substance Hazard warnings Handling, storage, and reactivity information in safety data sheet (sds).
A Safety Data Sheet is a thorough informational document created by the maker or importer of a hazardous substance (formerly known as a Material Safety Data Sheet). It outlines the product's chemical and physical characteristics. A Safety Data Sheet (SDS), also known as a Material Safety Data Sheet (MSDS), is a document that outlines the risks associated with working with chemicals and the precautions that should be taken to guarantee safety. SDSs are a key resource for details on chemical handling and dangers. SDSs must be kept in a position that is easily accessible to all employees throughout working hours (not behind a locked door or on a password-protected device to which they do not have the password). SDSs have to be kept nearby the work area.
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You are the supervisor in a car assembly plant where each car produced requires one body and four wheels. You discover that the plant has bodies and wheels. How many cars can be made from this inventory? (How does this problem fit in with the law of definite proportions?)
Answer & Procedure
Given the problem, you can produce cars as long as you have 1 body and 4 wheels. If one part is missing, either the body or a wheel, you will not be able to produce the car. This relates to the law of definite proportions, which states that a given chemical compound always contains the same elements in the same proportions by mass. For example, pure water contains 11.19% hydrogen and 88.81% oxygen by mass. It does not matter where the sample of water came from or how it was prepared. Thus, the car will contain 1 body and 4 wheels.
In the chemistry lab, a student makes a potassium hydroxide (KOH) solution by adding 40 grams of KOH to 500 mL of water. To check for understanding of solutions, the teacher asks the student to answer the following questions about the solution they have prepared. (Answer each question)Which substance is the solvent in your solution?Which substance is the solute in your solution?Calculate the molarity of your solution (show your work).The next step in the lab procedure is to dilute the concentration to 1.0 M. What volume of solvent should be added to the solution to dilute it to the proper 1.0 M concentration? (Show your work).
Since KOH dissolves in water so KOH is solute while water is solvent.
[tex]Molarity\text{ = }\frac{moles\text{ of solute}}{volume\text{ of solution in ml}}\text{ * 1000}[/tex]Now, we need to calculate moles of solute (KOH)
[tex]Moles\text{ of KOH =}\frac{given\text{ mass of KOH}}{molar\text{ mass of KOH}}[/tex][tex]=\text{ }\frac{40}{56}=0.714[/tex][tex]So,\text{ Molarity = }\frac{0.714}{500}*1000=\text{ 1.428 mol/L}[/tex]Now, we need to dilute the solution, so we will use molarity equation for dilution which is M1V1 = M2V2
Here, M1= 1.428 M; V1= 40 ml; M2 = 1 M; we need to find V2
[tex]1.428\text{ * 40 = 1 * V2}[/tex]Therefore, V2 = 57.12 mlHow do you find the Molar mass of Ag2SO4
Answer
Molar mass of Ag₂SO₄ = 311.797 g/mol
Explanation
To find the molar mass of Ag₂SO₄, we need to check for the atomic masses of the elements that make up the compound from the periodic table.
From the Periodic Table, the atomic mass of: (Ag = 107.8682 g/mol, S = 32.065 g/mol, O = 15.999 g/mol)
So the molar mass of Ag₂SO₄ = 2(Ag) + S + 4(O)
Ag₂SO₄ =(2 x 107.868) + 32.065 + (4 x 15.999)
Ag₂SO₄ = 215.7364 + 32.065 + 63.996
Ag₂SO₄ = 311.797 g/mol.
Hence, the molar mass of Ag₂SO₄ = 311.797 g/mol.
which of the following is a possible way to describe the components in the reaction below
The Stoichiometry is the coefficients that is written in front of the molecule or element. The number that is written on the foot of the element is atom. Therefore, option D is correct option
What is stoichiometry?Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.
The balanced equations
2Ag(s)+I₂(s)[tex]\rightarrow[/tex]2AgI(s)
Stoichiometry basically give the mole ratio between the reactant and the product
Thus we can say that 2 mole of Ag reacts with 1 mole of I₂ to give two mole of AgI or 2 formula units of AgI. in case of compound, mole is also called formula unit.
Therefore, option D is correct option
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Answer:
B
Explanation:
I got it right
All electromagnetic waves travel at the same speed in a vacuum. However, different kinds of electromagnetic waves have different wavelengths. For example, microwaves have longer wavelengths than visible light. How is it possible for both microwaves and visible light to travel at the same speed in a vacuum if they have different wavelengths?
a
The waves of visible light have less energy than microwaves.
b
Microwaves and visible light have different frequencies.
c
The distance between a point on one wave to the identical point on the next wave is the same for both microwaves and visible light.
d
Microwaves and visible light have the same energy.
The electromagnetic radiation the micro waves and visible light will travel at same speed in vacuum as their energies are the same in vacuum.
What are electromagnetic radiation ?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.
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44 is what percent of 132?
33.33
Explanations:Let the required percentage value be "x".
44 is what percent of 132 is expressed as:
[tex]44=x\%\text{ of 132}[/tex]Simplify the equation to geet the values of "x"
[tex]\begin{gathered} 44=\frac{x}{100}\times132 \\ 44=0.01x\times132 \\ 44=1.32x \end{gathered}[/tex]Divide both sides by 0.32 to have:
[tex]\begin{gathered} 1.32x=44 \\ \frac{\cancel{1.32}x}{\cancel{1.32}}=\frac{44}{1.32} \\ x=\frac{44}{1.32} \\ x\approx33.33 \end{gathered}[/tex]If an element with atomic mass 201 undergoes alpha decay, what is the mass number in the resulting element?
INFORMATION:
We know that:
- an element with atomic mass 201 undergoes alpha decay
And we must find the mass number in the resulting element
STEP BY STEP EXPLANATION:
To fin the mass number in the resulting element, we must know that
In general, during alpha decay, the atomic number (Z) is reduced by two, and the mass number (A), by four.
Now, knowing that the mass number is reduced by 4 and the atomic mass for our element is 201. Then, the atomic mass for the new element would be
[tex]201-4=197[/tex]ANSWER:
The mass number in the resulting element is 197
33 POINTS!!! PLEASE HELP ME FAST
Answer the following question: Ethanol, C2H5OH, is considered clean fuel because it burns in oxygen to produce carbon dioxide and water with few trace pollutants. If 500.0 g of H2O are produced during the combustion of ethanol, how many grams of ethanol were present at the beginning of the reaction? When answering this question include the following:
Have both the unbalanced and balanced chemical equations:
Explain how to find the molar mass of the compounds:
Explain how the balanced chemical equation is used to find the ratio of moles :
Explain how many significant figures your answer needs to have:
The numerical answer:
The mass of the ethanol used is 427.8 g
What is the balanced reaction equation?We know that combustion has to do with the process by which we burn one substance in another. The process of combustion is an oxidation reaction as we can see from the balanced reaction equation that is attached to this answer. Here, the ethanol is burned in oxygen and the result is carbon dioxide and water as shown in the image that have been attached.
Now;
We can see that the number of moles of water is 500.0 g/18 g/mol =28 moles
We can now say that;
one mole of ethanol does produce 3 moles of water
x moles of ethanol would then produce 10.9 moles of water
28 * 1 moles / 3mole
= 9.3 moles
In order to find the mass of the ethanol used;
9.3 moles * 46 g/mol = 427.8 g
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What is this symbol for the atom or ion that has 26 protons 30 neutrons and 24 electrons?
Answer: Fe+2
Explanation:
You have to take in account of the atomic number, mass number, and net charge:
The atomic number: The number of protons in the nucleus of an atom
Net Charge of atom: Overall charge of atom
The atomic number of Iron is 26.
The atomic mass is 56.
The net charge of an ion of iron is +2 (a cation)
The atomic mass of iron is 56.
All atoms are made up of subatomic particles: protons, and neutrons (part of the nucleus.) Electrons revolve around them, and are negatively charged. Protons are positive, and neutrons are negative.
In this case, an ion of iron has an 26 protons. Then:
Atomic number = number of protons= 26
The atomic number of iron is 26.
On the other hand, the mass number or atomic mass tells us the total number of particles in the nucleus. The mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:
Mass number = (number of protons) + (number of neutrons)
In this case, an ion of iron has an 26 protons and 30 neutrons. Then:
Mass number = 26 + 30
Mass number= 56
So, the atomic mass of iron is 56.
An ion is an atom or group of atoms with an electrical charge. Ions with a positive charge are called cations, while those with a negative charge are called anions. There is an imbalance between electrons, and protons.
The neutron is an electrically neutral subatomic particle, while the proton has a positive electrical charge. Electrons have a negative electrical charge.
So, the net charge of an atom or body is a function of the number of protons and electrons, and it is the algebraic sum of charges. In this case:
net charge= 26 positives electrical charges + (-24) negative electrical charge
net charge= 26 - 24
net charge= +2
Finally, the net charge of an ion of iron is +2 (a cation)
The Symbol would be Fe+2
22.9 mL of an unknown acid was neutralized by mixing it with 50.3 mL of NaOH in an aqueous solution. The final temperature of the solution was 35.2 °C. The initial temperature of the acid and base was 22.0 °C. Assuming that the density of the solution is 1.00 g/mL and the specific heat is 4.184 J/g°C, what is the heat of neutralization reaction?
When 22.9 mL of an unknown acid is neutralized by mixing it with 50.3 mL of sodium hydroxide in an aqueous solution. Then the heat of neutralization of reaction comes out to be -4043 joules
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of solution×specific heat capacity of solution×Change in temperature.
Total volume=22.9 ml+50.3 ml== 73.2 ml
mass of solution = density× volume
=73.2 ml×1g/ml
= 73. 2gm
enthalpy= 73. 2gm× 4.184 ×(35.2-22.0)
= 4043 joules
heat of neutralization reaction=-enthalpy
=-4043 joules
Thus the heat of neutralization reaction is -4043 joules
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Patient added a 17-g measured dose of polyethylene glycol 3350 (MIRALAX) to 180 mL of water to use as a laxative. If the volume of the resultant mixture was 195.6 mL, calculate the apparent density of polyethylene glycol 3350 and the specific gravity of the mixture
The density of a Substance is the ratio of the mass of that substance to its volume.
The apparent density of ethylene glycol 3350 = mass/Volume
the volume of polyethylene glycol = volume mixture -the volume of water
= 195.6 - 180
15.6 mL =
Apparent density of polyethylene glycol 3350 = 179/15.6 mL
1.099/m2
Now Density of water. 1.008/ml
Mass of water = Density X volume. 180g
=1.00 X 180 = 180g
Mass of solution = mass substance + mass of water
(17+180)g
=197g
Quantity mixture = mass of mixture/Volume
= 197g/195.6 mL
the specific gravity of mixture = density of mixture/density of water
1.01g/mL/1.00g/ml
The specific gravity of the mixture = 1.01.
Polyethylene glycol 3350 is used to treat occasional constipation. Polyethylene glycol 3350 belongs to a class of drugs called osmotic laxatives. It works by retaining water with the stool. This increases the frequency of bowel movements, softens the stool, and makes it easier to pass. This drug belongs to a class of drugs called osmotic laxatives. It works by increasing the amount of water in the intestinal tract. Polyethylene glycol 3350 is commercially available under the brand name MiraLax.
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What do you think all the stuff around you and in the universe itself is made from??
The universe contains practically incalculable numbers of planets, moons, asteroids, comets, and clouds of dust and gas, all of which are whirling around in the expanse of space together with billions of galaxies and trillions of stars.
What Is the Universe Made of?Helium is the second most prevalent element in the universe after hydrogen, and the two together make up almost all ordinary stuff. But only a little portion of the universe—about 5%—is represented by this. Everything else is constructed of materials that are invisible and can only be identified indirectly. About 100 seconds after the Big Bang, the temperature dropped to a still-seething 1 billion degrees Kelvin, during which all of the matter that makes up the known elements in the periodic table, as well as all other objects in the universe, such as black holes, massive stars, and specks of space dust, were created.About 380,000 years later, the universe had cooled to the point that protons and neutrons could combine to make lithium, helium, and the hydrogen isotope deuterium, while free electrons were trapped to create neutral atoms.To learn more about Big bang theory, refer
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If 3.3 moles of nitrogen gas occupies 2.5 L at an initial temperature of-50 degrees Celsius what is the pressure?
The pressure of nitrogen gas at initial temperature of-50 degrees Celsius is 35.004 atm.
How to solve given problem?Using Ideal gas equation PV = nRT,
Given:
P = ?
V = 2.5 L
n = 3.3 mol
R = 0.0821
T = (273 + 50) = 323 K
We can calculate the pressure, by putting the given values
P = 3.3 (0.0821) (323)/2.5
= 35.004 atm
Hence,
The pressure of nitrogen gas is 35.004 atm
What is the purpose of nitrogen gas and is it dangerous to people?• The chemical element with the atomic number 7 and the symbol N is nitrogen. The lightest nonmetal in group 15 of the periodic table is nitrogen. During the sample preparation phase of chemical analysis, nitrogen is frequently utilized. It is used to concentrate and condense liquid sample volumes. Additionally crucial to the chemical sector is nitrogen. It is used to make explosives, nylon, nitric acid, fertilizers, and colors.
• Nitrogen exposure is hazardous because it can displace oxygen and induce asphyxia. In areas with low oxygen levels, only self-contained breathing apparatus that have been authorized by NIOSH and have a full facepiece should be utilized.
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What is the name of the chemical formula Cl3N8?
A. chlorine nonanitrogen
B. trichlorine octanitride
C. chlorine nitride
D. tetrachlorine octanitride
Trichlorine octanitride is the name of the chemical formula Cl₃N₈.
So, the correct answer is option (B) trichlorine octanitride.
A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements.
If only one atom of a specific type is present, no subscript is used. For atoms that have two or more of a specific type of atom present, a subscript is written after the symbol for that atom.
A chemical formula is an expression that represents the element in that compound along with its relative proportion in the compound.
Example of Chemical formula for water is H₂O.
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what is the mass (in grams) of 1.45 mol BaBr2?
Answer:
297.135 gram
Explanation:
Answer:
The answer is 430.85g
Explanation:
In order to solve this you would have to go from the moles given and convert it to grams.
You do this by multiplying the given moles (1.45) by the molar mass (297.138 g).
You would get a final answer of 430.85 grams of BaBr2.
**To get the molar mass, add up the masses of the elements together. You get this masses from the periodic table.
Identify the limiting reagent in this reaction using a starting amount of 62.64g of C and 12.41g of H2 reactant. Show your work
The balanced equation is:
2C(s) + 3H2(g) --> C2H6(g)
The molar mass of C is 12.01 g/mol.
The molar mass of H2 is 2.02 g/mol.
The limiting reagent in the reaction is H₂.
What are limiting reagents?Limiting reagents are the reagents in a chemical reaction that are completely used up.
When limiting reagents in a reaction are used up, the reaction will no longer proceed toward the formation of products. Hence, chemical reactions are dependent on limiting reagents.
Given the balanced equation of the given reaction below:
2 C(s) + 3 H₂ (g) --> C₂H₆ (g)
From the reaction, 2 moles of C react with 3 moles of H₂
moles of C = 62.64 / 12.01
moles of C = 5.22 moles
Moles of H₂ = 12.41 / 2.02
Moles of H₂ = 6.14 moles
There are not enough moles of H₂ to completely react with C based on the mole ratio.
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21. The law of definite proportions
A. contradicted Dalton's atomic theory.
B. agrees with Dalton's atomic theory.
C. replaced the law of conservation of mass.
D. assumes that atoms of all elements are identical
Dalton's Atomic Theory and the Law of Definite Proportions are compatible. Hence option b that is Law of Definite Proportions agrees with Dalton's atomic theory is correct statement.
What is the atomic theory of Dalton?
The second part of the theory states that every atom in a certain element has the same mass and properties. The third part defines compounds as mixtures of two or more different types of atoms.
As a result, Dalton's theory acknowledged that all matter is composed of atoms, which is true, but it did not acknowledge the existence of smaller particles within atoms, which is incorrect.
Because compounds are made by the fusing of two or more different types of atoms, Dalton's theory, which claimed that atoms could not interact with one another, is incorrect.
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Determine the quantity of nitrogen atoms in 15.0
grams of Pb(NO₂)2
The quantity of nitrogen atoms in 15.0grams of Pb(NO₂)2 is 30.
What are Nitrogesn Atoms?
The atomic number of a nitrogen is 7. Molecular nitrogen (N2) is a widely used chemical molecule that consists of two securely linked nitrogen atoms. At normal temperatures and pressures, molecular nitrogen is a colourless, odourless, tasteless, and inert gas.
2 nitrogen atoms are present in each formula unit of lead(II) nitrite Pb(NO₂)2. 4 oxygen atoms, 2 nitrogen atoms, and 1 lead atom make up this compound.So, the quantity of nitrogen atoms in 15.0 grams of Pb(NO₂)2 is 15 x 2 = 30.
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The first ionization energies of five consecutive elements in the periodic table with atomic numbers Z, Z+1, Z+2, Z+3 and Z+4 are given below. Z is less than 16 and one of these elements is a metal. The ionization energy values are not given in any particular order. Ionization Energies: Energies: 495, 1313, 1681, 2081, 1402 kJ mol-¹
Answer:
Z: 495
Z+1: 1313
Z+2: 1402
Z+3: 1681
Z+4: 2081
Explanation:
The attached shows that ionization energy increases up and to the right. If we have five consecutive elements then that means as we increase the atomic number we are moving to the right and therefore increasing ionization energy.
I know this question is not related to homework or anything school-related, but bare with me.
I like this girl, but I don't know her name yet, but I think I know her well. How do I get her to talk to me?
Across the periodic table, atomic radius continues to decrease through Group 17. How does this fact help explain why the metals in Group 3 through 13 are less reactive than the metals in Group 1 and 2
What is the mass of 5.40 moles of sulfuric acid (H₂SO4) if the molar mass of H₂SO4 is
98.0 g/mol? (1 point)
49.0g
98.0g
265g
529g
The mass of the sulfuric acid is 529.2 g
What is molar mass?
The molar mass refers to the one mole of a chemical is its molar mass.
Given:
Moles = 5.40
Molar mass = 98.0 g/mol?
The formula used = no of moles = Given mass/molar mass
Let's say given mass = X
X= 98.0 * 5.40 = 529.2 g
Hence, the answer is 529.2 g of H2SO4
To learn more about the molar mass concept, check the given link
https://brainly.com/question/837939
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