) Calculate The Gibbs Energy Change For The Formation Of Propane At 298K.Given That H For Propane Is (2024)

The question is incomplete, the complete question is;

In this stoichiometry problem, determine the percentage yield:

Excess aluminum metal reacts with aqueous nickel(II) sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. In this reaction 108 g of aluminum were combined with 464 g of nickel(II) sulfate to produce 274 g of aluminum sulfate.

Answer:

80%

Explanation:

The reaction equation is;

2Al(s) + 3NiSO4(aq) --------> Al2(SO4)3 + 3Ni(s)

Since Al is in excess then NiSO4 is the limiting reactant.

Number of moles in 464 g of NiSO4 = mass/ molar mass

Molar mass of NiSO4 = 155 g/mol

Number of moles = 464g/155g/mol = 2.99 moles

Number of moles of Al2(SO4)3 = mass/molar mass

molar mass = 342 g/mol

Number of moles = 274g/342g/mol = 0.8 moles

From the reaction equation;

3 moles of NiSO4 yields 1 mole of Al2(SO4)3

2.99 moles of NiSO4 yields 2.99 * 1/3 = 1 mole of Al2(SO4)3

% yield = actual yield/ theoretical yield * 100/1

actual yield = 0.8 moles of Al2(SO4)3

Theoretical yield = 1 mole of Al2(SO4)3

% yield = 0.8/1 * 100 = 80%

In this exercise we have to use the knowledge of reaction to calculate the required percentage, in this way we find that:

[tex]80\%[/tex]

The reaction equation is;

[tex]2Al(s) + 3NiSO_4(aq) \rightarrow Al_2(SO_4)_3 + 3Ni(s)[/tex]

Since Al is in excess then NiSO4 is the limiting reactant. Now knowing that the data informed is:

Number of moles in 464 g of NiSO4 Molar mass of NiSO4 = 155 g/molNumber of moles = 2.99 molesNumber of moles of Al2(SO4)3Molar mass = 342 g/molNumber of moles = 0.8 moles

From the reaction equation;

[tex]\% yield = actual\ yield/ theoretical\ yield * 100/1\\\% yield = 0.8/1 * 100 = 80%[/tex]

See more about reaction at brainly.com/question/3664113

Answer:

go with that persons

Explanation:

Answer:

The answer to this question is given below in the explanation section.

Explanation:

The Bohr model depicts an atom as a small, positively charged nucleus surrounded by electrons.These electrons travel in circular orbit around the nucleus similar in structure to the solar system,except electrostatic forces rather than gravity provide attraction.Electron orbit around the nucleus resembles that of planets around the sun in the solar system.

The Bohr model was an improvement on the earlier cubic model(1902),the plum pudding model(1904) the saturnine model (1904) the rutherford model (1911) since the Bohr model is a quantum physics based modification of the Rutherford may source combine the two:the Rutherford-Bohr model

Although revolutionary at the time,the Bohr model is a relatively primitive model of the hydrogen atom compared to the valence shell atom.As an initial hypothesis it was derived as a first order approximation to describe the hydrogen atom.Due to its simplicity and correct results for selected systems.

In 913 Bohr suggested that electrons could only have certain classical motions:

Electrons in atoms orbit the nucleus.The electrons can only orbit stably,without radiating in certain orbits at a certain discrete set of distances from the nucleus.These orbit are associated with definite energies and are also called energy shells or energy levels.Electrons can only gives or lose energy by jumping from one allowed orbit to another,absorbing or emitting electromagnetic radiation with a frequency (v) determined by the energy difference of the levels according to the plank relation.

Answer:
50 g/mL

Explanation:
Density=mass/volume
Plug in given values
D=500g/10mL
D=50g/mL

I hope this helps!

Answer:

8.822 × 10¹³ g Co

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

9.015 × 10³⁵ atoms Co

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Co - 58.93 g/mol

Step 3: Convert

[tex]9.015 \cdot 10^{35} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} )[/tex] = 8.82189 × 10¹³ g Co

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

8.82189 × 10¹³ g Co ≈ 8.822 × 10¹³ g Co

Answer:

B. insulator

hope it helps

The materials which prevents flow of electric current through it is called insulators. Thus, option B is correct. The materials which allow the current are conductors.

What are insulators?

There are three types of substances based on their conducting nature. The materials which are highly conducting electrically at normal condition are called conductors. For example: metals.

Materials which does not conduct electricity at any condition are called insulators. Insulators prevent the flow of free electrons and thus are resistant to electric shock, example: wood

Some materials which does not conduct at normal temperature but, will conduct at higher temperature and also upon mixed with other materials are called semiconductors. example: silicon. Therefore, option B is correct.

To find more on insulators, refer here:

https://brainly.com/question/24909989

#SPJ5

Answer:

Pure substances are further broken down into elements and compounds. ... A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.

Explanation:

D.

D. Is the answer because government leaders won’t give their citizens the freedom and opportunities they deserve especially in a democracy.

I hope this helped!

I would appreciate it if you gave me a Thanks and a brainliest (:

Answer:

ammonia water especially : the impure solution obtained as a by-product in destructive distillation (as of coal, tar, and bones)

Explanation:

Answer:

liquor ammonia is the ammonia water especially , the impure solution obtained as a by-product in destructive distillation (as of coal, tar, and bones)

Answer:

Instructions on balancing chemical equations:

Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below

Always use the upper case for the first character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide

To enter an electron into a chemical equation use {-} or e

To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.

Example: Fe{3+} + I{-} = Fe{2+} + I2

Substitute immutable groups in chemical compounds to avoid ambiguity.

For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced,

but PhC2H5 + O2 = PhOH + CO2 + H2O will

Compound states [like (s) (aq) or (g)] are not required.

If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.

Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.

Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reage

Explanation:

Lightbulb 1 has the lowest percentage of energy lost as waste : 25%

Further explanation

Given

The input, output, and waste energy of Lightbulb

Required

The lowest percentage of energy lost as waste.

Solution

Lightbulb 1 :

[tex]\tt \%energy~lost=\dfrac{50}{200}\times 100\%=25\%[/tex]

Lightbulb 2 :

[tex]\tt \%energy~lost=\dfrac{30}{100}\times 100\%=30\%[/tex]

Lightbulb 3:

[tex]\tt \%energy~lost=\dfrac{100}{150}\times 100\%=66.7\%[/tex]

Answer: lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out

Explanation:

Answer: The resultant pressure is 3.22 atm

Explanation:

Gay-Lussac's Law: This law states that pressure is directly proportional to the temperature of the gas at constant volume and number of moles.

[tex]P\propto T[/tex] (At constant volume and number of moles)

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 2.79 atm

[tex]P_2[/tex] = final pressure of gas = ?

[tex]T_1[/tex] = initial temperature of gas = 273K

[tex]T_2[/tex] = final temperature of gas = 315 K

[tex]\frac{2.79}{273}=\frac{P_2}{315}[/tex]

[tex]P_2=3.22atm[/tex]

Thus the resultant pressure is 3.22 atm

Explanation:

When liquidisopropanol(C3H8O)burns in oxygengas,carbon dioxidegas and liquidwater are produced. When dissolved sodium hydroxide reacts with sulfuric acid, aqueous sodium sulfate andwater are formed.

Answer:

[tex]\boxed {\boxed {\sf 50.1 \ kJ}}[/tex]

Explanation:

When water changes from ice (solid) to water (liquid), it is melting or fusion. Therefore, we can use the following formula to find energy:

[tex]q=mH_f[/tex]

where q is the energy, m is the mass, and Hf is the heat of fusion.

1. Define Values

The mass is 150 grams. The heat of fusion for water is 334 Joules per gram.

[tex]m= 150 \ g \\H_f=334 \ J/g[/tex]

2. Calculate Energy

Substitute the values into the formula.

[tex]q=150 \ g * 334 \ J/g[/tex]

Multiply. Note that the grams (g) will cancel each other out and leave Joules as our units.

[tex]q=150 *334 \ J[/tex]

[tex]q=50100 \ J[/tex]

3. Convert Units

We found the answer in joules, but the question asks for kilojoules, so we must convert.

There are 1000 Joules in 1 kilojoule. Therefore, we can divide the joules calculated by 1000.

[tex]50100 \ J *\frac{1 \ kJ}{1000 \ J}[/tex]

[tex]\frac{50100 \ kJ}{1000 \ }[/tex]

[tex]50.1 \ kJ[/tex]

50.1 kilojoules are needed to change 150 grams of ice to water.

Answer:

Empirical formula is NH₃

Explanation:

Given data:

Percentage of hydrogen = 82%

Percentage of nitrogen = 18%

Empirical formula = ?

Solution:

Number of gram atoms of H = 18 / 1.01 = 17.8

Number of gram atoms of N = 82 / 14 = 5.9

Atomic ratio:

H : N

17.8/5.9 : 5.9/5.9

3 : 1

H : N = 3:1

Empirical formula is NH₃

Answer:

propyl

Explanation:

CH3-CH(CH3)-CH2 is a propyl group, the halogen is bromine thus the common name is propyl bromide

Answer:

You can find the mass of water by multiplying the density of water by its volume.

mass = Density x volume

Explanation:

It is very easy to find the mass of water once you know the formula of density. "Density" refers to mass per unit volume.

Density (ρ) = [tex]\frac{mass}{volume}[/tex]

Therefore, mass = ρ x volume

The density of water is 1 kg/L.

For example, if the volume of water is 500 ml, then you can get its mass by multiplying 500 ml by 1 kg/L.

Let's convert 500 ml to Liter first.

500 ml x [tex]\frac{1 L}{1,000 ml}[/tex] = 0.5 L

Now, let's compute.

mass = ρ x volume

mass = 1 kg/L x 0.5L

mass = 0.5 kg

The mass of a 500-ml water is 0.5 kg.

Answer:

the answer is god

Explanation:

because god created everything therefore hes the answer to everything

Answer:

(a) CH₄ + 2O₂ ----> CO₂ + 2H₂O

(b) 2CH₄ + 3O₂ ----> 2CO + 4H₂O

Explanation:

The burning of methane in an insufficient supply of air leads to incomplete combustion releasing carbon monoxide which is extremely poisonous and cause death.

When methane burnt in air or oxygen, it produces large amounts of heat, together with carbon dioxide and water vapour

Answer: A) 28%

This value is approximate.

=============================================

Work Shown:

From the periodic table, we are working with these elements

K = PotassiumI = IodinePb = Lead

and they form these relevant compounds

Potassium iodide = KILead (ii) iodide = [tex]PbI_2[/tex]

Note: the lead (ii) nitrate chemical formula and it's chemical data (eg: atomic mass) doesn't matter so we won't worry about it.

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

Using the periodic table, specifically the atomic mass of each element mentioned, we can find that:

Molar Mass of KI = 166.00277 grams per molMolar Mass of PbI2 = 461.00894 grams per mol

They are approximate values based on the average atomic mass.

Those values are handy in calculating the theoretical yield

That theoretical yield is roughly...

[tex]\left(23 \text{ g } KI\right)*\left(\frac{\text{1 mol } KI}{\text{166.00277 g } KI}\right)*\left(\frac{\text{1 mol } PbI_2}{\text{1 mol} KI}\right)*\left(\frac{\text{461.00894 g } PbI_2}{\text{1 mol } PbI_2}\right)\approx 63.8736668 \text{ g } PbI_2[/tex]

So 23 grams of potassium iodide, and the excess amount of lead (ii) nitrate (the amount of this isn't important as long as it exceeds the potassium iodide amount) react together to produce a theoretical yield of about 63.8736668 grams of lead (ii) iodide precipitate.

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

Despite us calculating the theoretical yield to be 63.8736668 grams, we actually only got 18 grams. We call this the "actual yield".

To get the percent yield, we divide the actual yield over the theoretical yield and multiply by 100%

So,

[tex]\text{percent yield} = \frac{\text{actual yield}}{\text{theoretical yield}}*100\%\\\\\text{percent yield} \approx \frac{18 \text{ g of } PbI_2}{63.8736668 \text{ g of } PbI_2}*100\%\\\\\text{percent yield} \approx \frac{18}{63.8736668}*100\%\\\\\text{percent yield} \approx 0.2818*100\%\\\\\text{percent yield} \approx 28.18\%\\\\\text{percent yield} \approx 28\%\\\\[/tex]

In short, we expected to get a theoretical amount of roughly 63.87 grams of lead (ii) iodide, but instead we got roughly 28% percent of that theoretical amount and got 18 grams of it instead.

Answer:

Don't travel by air if you can avoid it because air travel uses up large amounts of fossil fuels and creates greenhouse gases. Dispose of any rubbish responsibly - it can be hazardous to wildlife. Use public transport, cycle or walk instead of using a car. Use facilities and trips run by local people whenever possible.

Answer:

Practicing recycling and green computing

Answer:

Originally Answered: Why isammoniaingasform atroom temperature? That is becauseammonia'sboiling point is -33.34 Celsius or -28 Fahrenheit. The average householdtemperatureis about 28 to 32 Celsius depending where you live but wherever it is, it is definitely above the boiling point ofammonia.GOOD LESSONS ♡

Answer:

c)vibrating and in a regular arrangement

Explanation:

Copper is a chemical element represented by the symbol Cu and having atomic number 29. Copper is a transition metal which means its subshells are not completely filled and that is why they are vibrating in the room temperature. But copper is a solid at room temperature with regular arrangement of atoms.

Hence, the correct answer is "c)vibrating and in a regular arrangement".

Answer:

ok so im gonna go and do some for your latest questions then if thats alright with you

Explanation:

i need points so im trying to help as many people as i can before the end of the day.

but you have to make the questions forst so i can help you understand them

Answer:

An amphoteric oxide is an oxide that can act as either an acid or base in a reaction to produce a salt and water. Amphoterism depends on the oxidation states available to a chemical species. Because metals have multiple oxidation states, they form amphoteric oxides and hydroxides.Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide. Amphoteric oxides also include Lead (II) oxide, and zinc (II) oxide, among many others.[2]

Explanation:

hope this will help you

Answer:

Amphoteric oxides react with both acids and alkalis to form salt and water. Examples of amphoteric oxides are zinc oxide and aluminium oxide.

Explanation:

hope it helps....

Answer:

Al(No3)3

Explanation:

hope this is correct....

Answer:

The correct answer is -

1. 1 grain of sand = 244 red blood cells.

2. 1 penny = 2439

Explanation:

A normal red blood cell has a normal disk diameter of 6.2 - 8.2 micron or micrometer is way small than a grain of sand which ranges in diameter from 0.0625 mm (or ​1⁄16 mm) to 2 mm. The size of the diameter of a penny is given 0.02 m.

Let take the highest value of them:

RBC = 8.2 micrometer

The grain of sand = 2 mm

Penny = 0.02 m

we know:

1 meter = 10e+6 or 100000 micron

1 millimeter = 1000 micron

then, the grain of sand = 2* 1000 = 2000

so, the 1 grain sand = 2000/8.2

= 244

Similarly,

Penny = 0.02*100000= 20000

= 2439

Thus, the correct answer is =

1. 1 grain of sand = 244 red blood cells.

2. 1 penny = 2439

Explanation:

The region x of the atom shown is called the nucleus of the atom shown. The nucleus of an atom contains protons and neutrons.

Protons are the positively charged particles found in the nucleusNeutrons do not carry any charges. Together protons and neutrons determines the mass of the atom. The mass of an atom is concentrated in the nucleusBoth particles have equal masses

The region y is the atomic orbital where electrons can be found.

Answer:

Mass = 9.58 g

Explanation:

Given data:

Mass of Zn = 2g

Theoretical yield of ZnI₂ = ?

Solution:

Chemical equation:

Zn + I₂ → ZnI₂

Number of moles of Zn:

Number of moles = mass/molar mass

Number of moles = 2g / 65.38 g/mol

Number of moles = 0.03 mol

Now we will compare the moles of Zn and ZnI₂.

Zn : ZnI₂

1 : 1

0.03 : 0.03

Mass of ZnI₂:

Mass = number of moles × molar mass

Mass = 0.03 mol × 319.22 g/mol

Mass = 9.58 g

Answer:

1. Newton's third law of motion

2. Unbalanced

3. Action