I’m having trouble figuring out how to do number 13. Iv done some things but still cannot seem to figure it out.

32.6 grams

Given the reaction between aluminium and ferric oxide as shown;

Determine the moles of Aluminium

Mole = Mass/Molar mass

Mole = 10.5/26.98

Mole of Al = 0.3892moles

According to stoichiometry, 2moles of aluminium produced 3 moles of Iron, the moles of Iron needed is given as:

moles of Fe = 3/2 * 0.3892

moles of Fe = 0.5838moles

Determine the mass of iron

Mass of Fe = moles * molar mass

Mass of Fe = 0.5838 * 55.845

Mass of Fe = 32.6grams

Hence mass of iron that can be produced from 10.5 grams of aluminium is 32.6 grams

ANSWER

The theoretical yield of Fe is 109.64 grams

EXPLANATION

Given that;

The mass of Fe2O3 is 192 grams

The mass of CO is 82.5 grams

Follow the steps below to find the theoretical yield of Iron

Steps 1; Find the number of moles of Fe2O3 and CO using the below formula

Recall, that the molar mass of Fe2O3 and CO are 159.69 g/mol and 28.01 g/mol

Step 2; Determine the limiting raectant of the reaction

To determine the limiting reactant, divide the number of moles by the co-efficient of each reactant

From the calculations, the limiting reactant of the reaction is CO

Step 3; Find the number of moles of Fe using a stoichiometry ratio

Let x represents the number of moles of Fe

The number of moles of Fe is 1.963 moles

Step 4; Find the theoretical yield of Fe

Recall, molar mass of Fe is 55.845 g/mol

Therefore, the theoretical yield of Fe is 109.64 grams

Explanation:

The question requires us to identify the two elements present in the molecular formula C10H12O6N5P which present similar chemical and physical properties.

First, we need to identify all elements present in the molecule C10H12O6N5P:

- carbon (C)

- hydrogen (H)

- oxygen (O)

- nitrogen (N)

- phosporus (P)

Next, we can analyze the position of these elements in the periodic table:

Note that H is on the left side of the table, while the other elements (C, N, O and P) are closer together on the right side of the table.

We can see that although there are some elements close on the table, only N and P are part of the same group of the periodic table. Based on this, we can say that N and P should present similar properties because they are part of the same group.

Final answer: N and P should present similar chemical and physical properties (letter D).

Given the following parameters

moles of C21H23NO5 = 3.4 moles

Since there are 23 atoms of hydrogen in the compound, hence the moles of hydrogen in the compound is given as:

According to the Avogadro's constant

Convert the moles of hydrogen to atoms

Answer:

2. Ionic because the difference is 2

3. Based on loss and gain of electrons

4. Share the electrons unequally.

The pH of this solution is 0.207

Hello

To solve this question, we need to use the formula of solving pH of a solution from hydrogen or hydronium ion.

Now, we would proceed to substitute the given value and solve for it.

NB: we did not use the value of temperature because it is not needed in this solution.

From the calculation above, the pH of this solution is 0.207

Naturally occurring Uranium: 99.2745 %

Nuclear fuel for power generation: 97%

Nuclear bombs: 90 %

With a relative abundance of 99%, uranium-238 (238U or U-238) is the most prevalent isotope of uranium to be discovered in nature. It is non-fissile, unlike uranium-235, hence it cannot support a chain reaction in a thermal-neutron reactor.

A 1000 MWe pressurized water reactor needs about 27 tonnes of uranium per year, or over 18 million fuel pellets contained in more than 50,000 fuel rods. In contrast, a coal power plant of comparable scale would require more than 2.5 million tonnes of coal to generate the same amount of electricity.

15 kilograms: weight of a solid sphere of 100 percent uranium-235, just large enough to reach a critical mass with a beryllium reflector, nuclear weapons normally use a concentration of more than 90 percent.

Hence, the percentages are 99.27, 97 and 90% respectively.

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There are 1.02391×1024  no. of atoms in 1.70 moles of Calcium (Ca)

The approximate number of nucleons (protons or neutrons) in a gram of common stuff is known as the Avogadro number. 1 mole of any material contains the no of particles equal to the Avogadro number, that is, 6.023×1023particles.

The chemical element calcium has the atomic number 20 and the letter Ca as its symbol. Calcium is an alkaline earth metal that reacts with air to create a black oxide-nitride coating. Its heavier homologues barium and strontium are most similar to it in terms of physical and chemical characteristics.

Now,

Acc. to the Avogadro Number principal every 1 mole of any material contains the no of particles equal to the Avogadro number, that is, 6.023×1023particles.

So, the given amount of Calcium contains atom as follows:

1.70×6.023×1023 =1.02391×1024 atoms

Hence, There are 1.02391×1024  no. of atoms in 1.70 moles of Calcium (Ca)

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Step 1 - Discover the relation between moles and volume

The gas state equation states that:

Since the exercise says that both pressure and temperature will remain the same ("under the same conditions"), and R is already a constant, we can obtain a direct relation between moles and volume:

Since R, T and P will not vary, the quocient in parenthesis is a constant. Therefore, the volume will be directly proportional to the number of moles of gas.

Step 2 - using the relation to solve the problem

Since, as we saw, volume and moles are directly proportional to each other, we can set the following proportion to discover the new volume:

So, the volume of 0.27 moles of N2 gas, under the same conditions, will be 3.19 L.

Explanation:

Hey! The answer is True!

Hope this answer helps you

The ideal gas model was created to summarize some laws and study the behaviour of the gases, that depends on the properties.

It is really helpful and it is the first approach to the real behaviour of the gases, because all the other equations that came out after it, they have a basis on it. Historically, the ideal gas model was one of the first and most suitable ways to describe and calculate the properties of the gases.

It is also important that it's one of the easiest ways to relate the properties that are in the model, and it's very useful under certain conditions (specially temperature and pressure).

Step 1 - How to tell whether a given substance is ionic or covalent

To decide whether a substance is ionic or covalent, we must look for metals in its formula. If the substance is composed of both metals and non metals, it is an ionic susbtance.

If it's, on the other hand, composed solely by non-metals, it is a covalent substance.

Covalent substances do not produce ions in aqueous solution. Therefore, they can't be "broken into ions".

Step 2 - Analysing the given substances

H2O --> composed of H and O; both non-metals, so covalent

LiF --> composed of a metal (Li) and a non-metal (F), so ionic

K3PO4 --> composed of a metal (K) and non-metals (P, O), so ionic

AgCl --> composed of a metal (Ag) and non-metal (Cl), so ionic

Step 3 - Answering the exercise

All substances except H2O should be broken into ions when writing a complete ionic equation.

Answer: all except H2O

Solubility of LaF3: "S"

First, we need to write the reaction of solubility:

LaF3 (s) <=> La+3 + 3 F-

Initial - 0 +0.011 (F-, from KF)

Change +S +3.S

Equilibrium S 0.011 + 3.S

Now, we know:

Ksp = [La³⁺]x[F⁻]³ = 2×10^−19 = S x (0.011+3.S)³

We work with: 2×10^−19 = S x (0.011+3.S)³, and we clear the "S"

=> S = 1.5x10^-13 mol/L x (195.9 g/mol) = 2.93x10^-11 g/L

The molar mass of LaF3 = 195.9 g/mol

Answer: S = 2.93x10^-11 g/L

1) Characteristics of the elements mentioned.

Chlorine, Iodine, and Astatine are nonmetals. They are in the 17th group the halogens. They're in the p-block

Copper and Vanadium are transition metals. They're in the d-block.

We can group these elements in metals (Copper and Vanadium) and nonmetals (Chlorine, Iodine, and Astatine)

For multiplication and division operations, we perform the operations normally, and the final result must be written with the same number of significant figures as the factor that has the fewest significant figures.

16.52 x 5.8 = 95.816

The result obtained in the above multiplication must be rounded to two significant figures, which correspond to the number of significant figures of the number 5.8. Therefore, we must round the result, giving as answer 96.

Answer: 96

Answer:

c

Explanation:

boulder was at rest on top of a hill so it contains abundant potentialenergy. When the boulder falls, its potential energy will change to kinetic energy, the energy of motion. When the boulder stops moving, its kinetic energy will transform back to potential energy

Answer

b. Add solute to a saturated solution and heat until all of the solute dissolves. Then, slowly cool to the original temperature.

Explanation

A supersaturated solution contains more dissolved solute than required for preparing a saturated solution and can be prepared by heating a saturated solution, adding more solute, and then cooling it gently. Excess dissolved solute crystallizes by seeding supersaturated solution with a few crystals of the solute.

Therefore, a supersaturated solution is prepared by:

b. Add solute to a saturated solution and heat until all of the solute dissolves. Then, slowly cool to the original temperature.

Which protective measure is 100 percent effective at reducing the risk of sexually transmitted disease is . and Abstain from sexual activity.

The protective measure is 100 percent effective at reducing the risk of sexually transmitted disease is only Abstain from sexual activity. The other methods that is keep number of partners to a minimum , use birth control pills correctly are for reducing risk for pregnancy. Use a condom during intercourse is reduce the risk for sexually transmitted disease but not 100 % effective.

Thus, Which protective measure is 100 percent effective at reducing the risk of sexually transmitted disease is  Abstain from sexual activity.

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Answer:

Explanation:

Here, we want to get the number of grams in 12.5 moles NaBr

To get this, we have to multiply the number of moles by the molar mass of NaBr

The molar mass of NaBr is 103 g/mol

Thus, we have the mass as:

This can be approximated to 1290 which is the nearest whole number

Answer:

Q = -5,365 J    

Explanation:

To find the amount of heat released, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = heat (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = T₂ - T₁ = change in temperature (°C)

"T₂" represents the final temperature and "T₁" represents the initial temperature. You can plug the given values into the equation and solve to find "Q".

Q = ? J                         c = 2.9 J/g°C

m = 50 g                     ΔT = 18°C - 55°C = -37°C

Q = mcΔT                                               <----- Given equation

Q = (50 g)(2.9 J/g°C)(-37°C)                  <----- Insert values

Q = -5,365 J                                          <----- Multiply

*the answer is negative because the reaction is exothermic (heat is being released from the system)

First, we have to convert the number of molecules to the number of moles of CO2 (carbon dioxide), and to do this we can do the Avogadro's number:

The Avogadro's number helps us to determine the number of moles based on the number of molecules or atoms of a compound. This number is 6.022 x 10 ^(23) /mol.

So, the conversion from molecules to moles would be:

Now, using this data we can calculate the number of moles needed for propane (C3H8).

In the chemical reaction, you can see that 1 mol of propane produces 3 moles of CO2, so the calculation would be:

The answer is that 0.78 moles of C3H8 were burned and produced 2.325 moles of CO2 which is 1.4 x 10 ^(24) molecules of CO2.

a) Calculate the density of the block.

The density of any substance is defined as the mass divided the volume.

Density of the block = mass of the block/volume of the block.

We are given the mass of the block.

mass of the block = 5.60 kg

Since the it is an iron cube, we can find its volume.

Side = 20 cm = 0.20 m

Volume of the block = (side)³

Volume of the block = (20 cm)³ = (0.20 m)³

Volume of the block = 8000 cm³ = 0.008 m³

Now that we know the mass and the volume we can find the density of the block.

Density of the block = Mass of the block / Volume of the block

Density of the block = 5.60 kg / 8000 cm³

Density of the block = 0.0007 kg/cm³

Density of the block = 5.60 kg / 0.008 m³

Density of the block = 700 kg/m³

Answer: The density of the block is 0.0007 kg/cm³ or 700 kg/m³

b) Calculate the mass of water displaced:

If we consider that the cube is completely submerged (as the problem says) it will displace some water. How much water does it displace? Archimedes' says: "The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid". That means that the block completely submerged in water (fluid) will displace its volume of water.

volume of water displaced = volume of the block

volume of water displaced = 8000 cm³ = 0.008 m³

Now that we know the volume of water displaced, and since we are given the density of water, we can find the mass of water displaced.

Density of water = mass of water / volume of water

mass of water = volume of water * density of water

mass of water = 0.008 m³ * 1000 kg/m³

mass of water displaced = 8.0 kg

Answer: Supposing that the block is completely submerged it displaces 8.0 kg of water.

Answer:

The final temperature is 3,952K. (The closest option is 3,950K).

Explanation:

The given information from the exercise is:

- Initial pressure (P1): 300.6mmHg

- Initial volume (V1): 1.23L

- Initial temperature (T1): 218.5K

- Final volume (V2): 8.32L

- Final pressure (P2): 802.75mmHg

We can calculate the final temperature (T2), by replacing the values of P1, V1, T1, V2 and P2 in the following formula of Ideal Gases:

So, the final temperature is 3,952K. (The closest option is 3,950K).

i,ii&iii only the alkanes forms 3-bromo-3-methylpentane as the major product when it's react with hbr.

What is alkane forms?

Alkanes are the series of a  compounds that is contain carbon and hydrogen atoms of the  with single covalently bonds. Theses are knowns as saturated if  hydrocarbons. This group of the  compounds consists of a  carbon and hydrogen and  atoms with single covalent bonds. Also it is comprises a homologous series of  having a molecular formula of NaBr+MgO.

Sol-this problem which of the following Elkins yields three bromo three metal painting as the major product upon addition of HBR. So let me just write an equation right? I'm writing here directly. So when HBR is reacted, so what will be the compound here? We will be getting a compound like this. Alright, so this is B. R. Again, we are processing here with H beyond right.

This is it. So now organic compound is going to be seen. This is beard. Right? So here you can point one more when you add here it's B. R. We will be getting here. Yeah, again, for this when weird it's beard. So again we will be getting to come home like this. So same compound we're getting that means this is this is nothing but three Bromo three metal contains as the major product. So all are having the same product and option is all of them is correct. Right? No next question it is asked at which of the following cardboard signs bill undergo At 1 2 metal shift. Right? So None of them ever was the correct answer because none of them will undergo 12 m shift.

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Although there are neutral solutions that feel slipery, this is not a characteristic of all neutral solutions.

Acid solutions normally feels similar to neutral solutions, just wet.

However, base solutions has the characteristics of feeling slippery.

So, the most correct answer would be base

Answer: Bases

Explanation:

Bases have a slippery feel. Many soaps and detergents contain bases. Strong bases are able to react with the fatty acids and oils that naturally occur on the surface of your skin. The product of the reaction (which is known as saponification) is effectively a soap, which is why it feels slippery.

The mass number of an atom is defined as the sum of the number of protons and the number of neutrons in that atom.

So, if m is the mass number, p is the number of protons and n is the number of neutrons, we have:

We have that:

So, the mass number is 64.

To solve the question we will assume that the gas behaves like an ideal gas, that is to say, that there is no interaction between the molecules. Assuming ideal gas we can apply the following equation:

Where,

P is the pressure of the gas

V is the volume of the gas

n is the number of moles

R is a constant

T is the temperature

Now, we have two states, an initial state, and a final state. The conditions for each state will be.

Initial state (1)

P1=975Torr=1.28atm

V1=3.8L

T1=-18°C=255.15K

Final state(2), STP conditions

P2=1atm

T2=273.15K

V2=?

We will assume that the number of moles remains constant, so the nR term of the first equation will be constant. For each state, we will have:

Since nR is the same for both states, we can equate the equations and solve for V2:

We replace the known values:

At STP conditions the gas would occupy 5.2L. First option

EXPLANATION:

PART

Soda drink is a mixture

PART B

Soda drink is a mixture and not a compound. This is because it contains different constituents and they are mixed together in the right proportion. Also, the composition of the constituents is uniform throughout the mixture.

1) Write the chemical equation.

List the elements in the reaction.

Reactants

C: 12

H: 24

O: 4

Products

C: 1

H: 2

O: 3

2) Balance C.

List the elements in the reaction.

Reactants

C: 12

H: 24

O: 4

Products

C: 12

H: 2

O: 25

3) Balance H.

List the elements in the reaction.

Reactants

C: 12

H: 24

O: 4

Products

C: 12

H: 24

O: 36

4) Balance O.

List the elements in the reaction.

Reactants

C: 12

H: 24

O: 36

Products

C: 12

H: 24

O: 36

5) Balanced chemical equation.