I’m struggling with determining the results of some of these problems.

The molarity of H₃PO₄ solution is 0.017 M.

The molarity of a solution is the amount in moles of the solute present in a given volume of solution.

In a titration, the unknown molarity of a given solution can be determined using the formula below:

CaVa / CbVb = Na/Nb

where;

Equation of reaction: 3 NaOH + H₃PO₄ ---> Na₃PO₄ + 3 H₂O

From the data given:

Ca = ?

Va = 20.00 mL

Cb = 0.05 M

Vb = 20.00 mL

Ca = 0.05 * 20 * 1/20 * 3

Ca = 0.017 M

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ANSWER

the empirical formula is MgH8O3

EXPLANATION

Given that;

The % composition of Mg is 46.2%

The % composition of H is 7.69%

The % composition composition of O is 46.2%

Assume the mass of the sample is 100g

To find the empirical formula, follow the steps below

Step 1; Find the mass of the elements

For Magnesium

For hydrogen

For oxygen

Step 2; Find the molar mass of the elements

The molar mass of oxygen is 15.999 g/mol

The molar mass of hydrogen is 1.00 g/mol

The molar mass of magnesium is 21.904.305 g/mol

Find the mole of the element

For Mg

For Hydrogen

For Oxygen

Step 3; find the mole ratio

In the above calculations, Mg has the least number of moles. Therefore to find the mole ratio divide the moles by the smallest moles

Therefore, the empirical formula is MgH8O3

Answer: Red

Explanation:

Answer:

Noble Gases

Explanation:

For this question, what does one of them have that the others don't?

Alkali Metals - These are in column 1 of the periodic table. They are the ones that have a charge of positive 1 since they give away their 1 electron in order to be stable.

Alkali Earth Metals - These are in column 2 of the periodic table. They are the ones that have a charge of positive 2 since they give away their 2 electrons in order to be stable.

Noble Gases - These are the elements in the last column of the periodic table. These elements do not need to give away or accept electrons because they are complete and stable!

Halogens - These are in column 17 in the periodic table. They are right next to the halogens, but still are not complete as they need 1 more electron in order to be stable. These elements have a charge of -1 because they take away an electron from another element (mainly the alkali metals) in order to be stable.

So, based off of their definitions, the only ones that do not need to gain or lose electrons are the noble gases. This is because they are complete and stable, the only ones out of these that do not need anything.

The percentage abundance of the blacked-eyed peas in the sample is 39.6%.

What is the percentage abundance ?

It is the ratio in which a particular substance occurs to the total occurrence of similar substances of the same kind.

Percentage abundance = (occurrence of substance/total occurrence of substance of similar kind)  × 100

Thus the percent abundance of the black eyed peas in this sample can be calculated as:

total number of beans = 187

number of blacked-eyed peas = 187 - 113 = 74

Percentage abundance = 74/187 × 100 %

                                        = 39.6%

Thus we can conclude, the percentage abundance of the blacked-eyed peas in the sample is 39.6%.

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Answer:

3/4

Explanation:

The major element found in our bones is calcium.

What are the essential and non-essential elements in the bones?

Animals have significant sites for storing elements in their mineralized tissues, including bone, teeth, antlers, and horns. These tissues contain the essential metals iron (Fe), zinc (Zn), manganese (Mn), and cadmium (Cd), as well as important elements including calcium (Ca), phosphorus (P), magnesium (Mg), and sulfur (S) (Cd). Numerous minerals are necessary for good animal physiology.

The main building block of bones and teeth is calcium. In addition to its function as a second messenger, calcium is critical for muscular action, blood coagulation, and membrane permeability. Calcium and phosphorus are both found in bones and teeth. Additionally, phosphorous is a component of ATP, phospholipids, nucleic acids, and other coenzymes.

Hence, calcium plays an important role in bones and also assists in the resorption of the bone.

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125.49kPa

According to the Gay's Lussac law, the pressure of the given mass of a gas is directly proportional to its absolute temperature provided that the volume is constant. Mathematically;

Given the following parameters

Iinitial pressure P1 = 294kPa

Initial temperature = 732.°C = 732+273 = 1005K

Final temperature = 156°C + 273 = 429K

Required

New pressure P2

Substitute the given parameters

Therefore the pressure of the gas when the temperature decreased to 156°C is 125.49kPa

Scientists define energy as the ability to do work.

In physics, power is the quantitative asset this is transferred to a frame or to a physical system, recognizable inside the overall performance of labor and within the form of warmth and light. power is a conserved quantity the regulation of conservation of electricity states that power may be converted in shape, however not created or destroyed.

Strength is defined as the capacity to do paintings, that's the ability to exert pressure inflicting displacement of an object. in spite of this complicated definition, its means is quite simple: energy is simply the pressure that causes matters to move. energy is split into sorts capacity and kinetic.

Power exists in many special forms. Examples of those are mild energy, warmth power, mechanical electricity, gravitational energy, electric energy, sound strength, chemical power, nuclear or atomic strength, and so on. every form may be converted or changed into the opposite form.

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The type of observation the data represent is a quantitative observation.

Quantitative observation can be described as a method of gathering and analyzing data. Quantitative observation  uses numerical data and statistical calculations to measure research and draw conclusions. It usually involves variables with a numerical value.

From the data given above which are in numerical dorm, we can conclude that the observation represented is a quantitative observation.

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The 0.2 moles of glucose are present in the 0.400 M solution.

What is molarity?

The amount of a substance in a specific volume of solution is known as its molarity (M).

As given in the solution

Volume = 0.500 L

Molarity = 0.400

By using the molarity formula

M = moles of glucose/Volume in liters

Let's say moles of glucose = X

X=  0.400 * 0.500 = 0.2 moles

Hence, the answer is 0.2 moles of glucose .

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If the atom of Astatine-214 undergo alpha particle, it will emit helium element as shown;

According to the decay, 4 is subtracted from the mass number and 2 from the atomic number.

According to the reaction, the new isotope produced is Bismuth-210

The amount, in grams, of ethanol that was present at the beginning of the reaction, would be 430 grams.

Ethanol burns in oxygen according to the following equation:

[tex]C_2H_5OH + O_2 -- > CO_2 + H_2O[/tex]

The balanced equation of the reaction will be:

[tex]C_2H_5OH + 3O_2 -- > 2CO_2 + 3H_2O[/tex]

The mole ratio of ethanol to water is 1:3.

The molar weight of H = 1 g/mol.

The molar weight of O = 16 g/mol

Molar weight of C = 12

Molar mass of water, [tex]H_2O[/tex] = (1 x 2) + 16 = 18 g/mol

Molar mass of ethanol, [tex]C_2H_5OH[/tex] = (12x2) + (1x5) + 16 + 1 = 46 g/mol

If, mole = mass/molar mass; mole of 500.0 g water will be:

    500/18 = 27.778 moles

Then, the equivalent mole of ethanol that burned, from the stoichiometric mole ratio, would be:

     27.778/3 = 9.259 moles

If, mass = mole x molar mass,

Then, 9.259 moles ethanol = 9.259 x 46 = 425.914

Since the molar mass has the least significant figures (two significant figures), the final answer will also have two significant figures.

Thus, the amount of ethanol that was present at the beginning of the reaction is 430 grams.

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Answer: 5

Balanced Reaction:

[tex]1K_2CO_3 + 1Cu(NO_3)_2[/tex]      ⇒   [tex]2KNO_3 + 1CuCO_3[/tex]

When taking the coefficients we are left with 1 + 1 + 2 + 1 = 5

Explanation:

Data provided:

T2 = 40.0 °C

(absolute temperature = T2 = 40.0 °C + 273 = 313 K)

------

T1 (absolute) = 20.0 °C + 273 = 293 K

------

The rate constant for a reaction at 40.0 °C is exactly 4 times that at 20.0 °C, mathematically:

k2/k1 = 4

------------------------

Here is used the Arrhenius expression as follows:

R = universal gas constant = 8.314 J/mol K

Ea = activation energy

------------------------

Procedure:

Answer: Ea = 52858.73 J/mol

The partial pressure of hydrogen gas in the mixture is:0.53334 atm.

What is partial pressure?
partial pressure. noun. the pressure that a gas would have if it took up the entire volume that the mixture of gases currently occupies.

P total,and the total number of moles in the mixture would be,

n total=nH2+nO2+nN2

This means that you could write

P total.V=ntotal.RT

p total=n total.RT/V

This is equivalent to

p total=[nH2+nO2+nN2].RT/V

therefore,

P total =PH2+PO2+pN2

now, to get the partial pressure of,let's Hydrogen gas

RT/V=Ptotal/nH2+nO2+nN2

therefore

PN2=XN2.p total

similarly,

PO2=XO2.p total

PN2=XN.p total

The total number of moles will be

[tex]ntotal[/tex] = 0.40+0.15+0.50=1.50 moles.

[tex]PH2[/tex]=0.40/1.50*2.0 atm =0.5334 atm.

[tex]PO2[/tex]=0.15/1.50*2.0 atm =0.2 atm.

[tex]PN2[/tex]=0.50/1.50*2.0 atm =0.66 atm.

Hence, the partial pressure of hydrogen gas in the mixture is:0.53334 atm.

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Answer:

The molarity of the solution is 0.99M.

Explanation:

The molaruty if a solution represents the amount of solute moles contained in 1 liter (1000ml) of a solution.

1st) In this case, we have 17.3g of KCl, so we have to use the KCl molar mass (74.5g/mol) to convert grams into moles:

Now we know that there are 0.23 moles of the solute KCl.

2nd) We have 0.23 moles of KCl contained in 231 mL of solution, so to calculate the molarity (moles of solute contained in 1000mL of solution), we can use a mathematical rule of three:

Finally, the molarity of the solution is 0.99M.

Answer:

1.91 atm

Explanation:

To start this question I would first look at what the question is giving us:

M= 2.10g Argon

T= 18.0°C

V= 660-mL

P= ?atm

We now would recognize that from the things given, the formula that suits it would be PV=nRT because it would have the given data present were we can solve for P.

R is a constant that is 0.082 L*atm/K*mol. This constant lets us know what units we need to convert in order move forward.

We would need our volume to be in Liters, our pressure in atm, our temperature in K and our mass in mols.

So then in order to convert the mass given, we would need to go from grams to mols. We do this by starting off with our given mass (2.10g) and then dividing it by the molar mass of the element Argon (39.948g). This would make a total of 0.052mols.

To convert the Celsius to Kelvin, we just need to add 273 to the temperature given. 18.0°C + 273 = 291K.

To convert our volume, 1000mL=1L, so we would divide our given mL by 1000. 600/1000= 0.660L.

Now we can go ahead and use our formula and plug in the numbers to solve for P.

PV=nRT

(x atm)(0.660 L)=(0.0526 mol)(0.082 L*atm/K*mol)(291 K)

When solved, we would get a final answer of 1.90173 atm. Our closest answer being 1.91 atm.

Step 1: Let's calculate the quantity in moles of anhydrous barium chloride using the resulted mass after the heating divided by its molar mass (molar mass of BaCl2 is 208.23 g/mol)

so:

8.57/208.23 = 0.04 moles of BaCl2

Step 2: Now let's calculate the quantity in moles of water. But first, we need to calculate the mass of H2O. For this, we just subtract the mass before the heating by the mass after the heating. The water evaporated because of the heat.

mass of H2O = 10.05 - 8.57 = 1.48 g

Now we divide the mass by its molar mass to find the quantity in moles (molar mass of water is 18 g/mol)

1.48/18 = 0.082 moles of H2O

Step 3: Now we determine the number ratio:

0.082/0.04 = 2

So the formula is:

Answer: a. BaCl2 x 2H2O

b. barium chloride dihydrate

The first step to solve this question is to state the combustion reaction for nonane:

After this, we have to convert the given masses of nonane and oxygen to moles using their molecular masses:

Use the stoichiometric ratio to determine the number of moles of oxygen that react with 0.20 moles of nonane.

From this, we can conclude that the limiting reactant of the reaction is oxygen, which means that we have to base our calculations on the amount of oxygen that reacts. Use the stoichiometric ratio of oxygen to water to find the amount of water produced:

Convert the amount of moles to grams using its molecular mass:

To find the percent yield, divide the actual amount of water produced by the theoretical amount of water produced and multiply by 100:

The percent yield is 16.2%.

In this question, we have to determine the molar concentration of the acid HCl, we have the following information:

5.0 mL of HCl

0.1245 M of NaOH

7 different volumes of NaOH, if we take the average value, we will have 58.8 mL of average

Now we can use the titration formula, which is:

MaVa = MbVb

Ma = molar concentration of acid

Va = volume of acid

Mb = molar concentration of base

Vb = volume of base

Now we add the values into the formula:

Ma * 5.0 = 0.1245 * 58.8

5Ma = 7.32

Ma = 7.32/5.0

Ma = 1.46 M

The molar concentration of HCl, based on the information provided and using the average value of volume for the base is 1.46 M

Answer:

???

Explanation:

????????????????????

NH3 is a weak base. In solution we write NH3(aq).

The question says NH3 because ammonia is a weak base and does not ionize strongly in water. To write the net ion equation, we need to remove the spectator ion. Removing the spectator ion leaves the net ion equation. This process can be repeated for each reaction to obtain the net ionic equation.

The net ionic equation describes only the species participating in the reaction while the full ionic equation also includes the spectator ion. A net ionic equation is a chemical equation of a reaction that lists only the species involved in the reaction. The net ionic equation is commonly used in acid-base neutralization reactions double displacement reactions, and redox reactions.

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To  see the number of atoms of any element in a molecule multiply the stoichiometry of that molecule to the number that is written on the foot of that element in that molecule the balanced equation are

[tex]2KCL+3O_{2} \rightarrow 2KClO_{3}[/tex]

[tex]2NH_{3} +\frac{5}{2} O_{2} \rightarrow 2NO+3H_{2} O[/tex]

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side

In first , The skeletal reaction is

[tex]KCl+O_{2} \rightarrow KClO_{3}[/tex]

The number of  oxygen atoms on left side is 2 while on product side it is 3 so to balance multiply by 3 to [tex]O_{2}[/tex] and by 2 to product side

[tex]KCl+3O_{2} \rightarrow 2KClO_{3}[/tex]

The number of atoms of Potassium and chlorine on left and right are 1 and 1 while on right side it is 2,2 so multiply [tex]KCl[/tex] by 2

The balanced equation is

[tex]2KCl+3O_{2} \rightarrow 2KClO_{3}[/tex]

In second the skeltal equation is

[tex]NH_{3} +O_{2} \rightarrow NO+H_{2} O[/tex]

The number of hydrogen atom is 3 while on produt side it is 2 so multiply [tex]NH_{3}[/tex] by 2 and [tex]H_{2} O[/tex] by 3

[tex]2NH_{3} +O_{2} \rightarrow NO+3H_{2} O[/tex]

now balance nitrogen

[tex]2NH_{3} +O_{2} \rightarrow 2NO+3H_{2} O[/tex]

Now balance oxygen and the balanced equation is

[tex]2NH_{3} +\frac{5}{2} O_{2} \rightarrow 2NO+3H_{2} O[/tex]

Thus the two balanced equation are

[tex]2KCL+3O_{2} \rightarrow 2KClO_{3}[/tex]  and

[tex]2NH_{3} +\frac{5}{2} O_{2} \rightarrow 2NO+3H_{2} O[/tex]

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Answer

Explanation

Given:

Moles of Ne = 5.25 mol

What to find:

The number of particles of Ne in 5.25 moles of Ne.

Step-by-step solution:

Conversion factor: 1 mole of any substance = 6.022 x 10²³ particles

Therefore, 5.25 moles of Ne will be equal

The Lewis dot structure for butyl thiol.

Lewis systems, also called Lewis dot formulas, Lewis dot systems, electron dot structures, or Lewis electron dot structures, are diagrams that display the bonding among atoms of a molecule, as well as the lone pairs of electrons that could exist inside the molecule.

A Lewis structure is based totally on the idea of the octet rule, in which atoms share electrons so that each atom has 8 electrons in its outer shell. for example, an oxygen atom has six electrons in its outer shell.

A Lewis shape is a totally simplified representation of the valence shell electrons in a molecule. it is used to expose how the electrons are arranged around man or woman atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the 2 atoms

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1) Write the chemical equation.

2) List the known and unknown quantities.

Sample: CH4.

Volume: 2.0 L.

Temperature: 30 ºC = 303.15 K.

Pressure: 3.0 atm.

Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1).

Moles: unknown.

3) Moles of CH4.

3.1- Set the equation.

3.2- Plug in the known values and solve for n (moles).

4) Moles of oxygen that reacted.

The molar ratio between CH4 and O2 is 1 mol CH4: 2 mol O2.

5) Volume of oxygen required.

Sample: O2.

Moles: 0.48 mol.

Temperature: 30 ºC = 303.15 K.

Pressure: 3.0 atm.

Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1).

Volume: unknown.

5.1- Set the equation.

5.2- Plug in the known values and solve for V (liters).

3.98 L of O2 is required to react with 2.0 L CH4.

.

114.05× 10²³ molecules are present in 3.41kg or 3410g of glucose

We know the relationship between no of moles and molar mass:

 n = W / M

where,

n = no of moles = ( ?)

W = Given mass  = (3.41kg)

M = Molar mass = ( molar mass of glucose is 180g)

Convert 3.41kg into grams we get 3.41 × 1000 = 3410g

n = W / M

   = 3410 / 180

   = 18.94 moles

Number of molecules is related to no of moles and Avogadro's number as:

   N = n × NA

where,

N = no of molecules/no of particles/no of atoms = ?

n = no of moles = ( 18.94 moles - found out from above formula )

NA = Avogadro's number = ( 6.022 × 10²³ )

N = n × NA

    = 18.94 × 6.022 × 10²³

   =  114.05× 10²³ molecules

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Balance the following half reaction occurs in basic media then Cl → ClO₃⁻

6OH⁻ + Cl⁻¹ → ClO₃⁻¹ + 3H₂O + 6e⁻

The concentration of OH⁻ is more than the solution called as basic medium

Here given reaction is

Cl → ClO₃⁻

Then the steps we have to follow are:

Balancing in basic solution then

And the equation is 6OH⁻ + Cl⁻¹ → ClO₃⁻¹ + 3H₂O + 6e⁻ in basic media

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