A heat engine has a temperature of 1800 k. some of the heat from the engine flows to the surroundings, which are at a temperature of 160 k. what is the approximate efficiency of the engine? 16% 91% 103% 109%

Answer:

X = 350 kJ/mol

Explanation:

According to the question:

Energy needed when breaking bonds  +  1640 kJ/mol   =   Energy released when forming bonds

∴ 2 (C - C) + 8 (C - H) + 5 (O = O) + 1640 = 6(C = O) + 8(O - H)

⇒ 2 (X) + 8 (410) + 5 (500) + 1640 = 6 (740) + 8 (460)

⇒ 2X  +  7420  =  8120

⇒ 2X = 700

⇒ X = 350 kJ/mol

1. The volume of ammonia consumed in the reaction is 23.2 L

2. The volume of oxygen consumed in the reaction is 29 L

4NH₃(g) + 5O₂(g) --> 4NO(g) + 6H₂O(g)

From the balanced equation above,

6 L of H₂O were produced from 4 L of NH₃ and 5 L of O₂

From the balanced equation above,

6 L of H₂O were produced from 4 L of NH₃

Therefore,

34.8 L of H₂O will be produced from = (34.8 × 4) / 6 = 23.2 L of NH₃

Thus, 23.2 L of NH₃ were consumed

From the balanced equation above,

6 L of H₂O were produced from 5 L of O₂

Therefore,

34.8 L of H₂O will be produced from = (34.8 × 5) / 6 = 29 L of O₂

Thus, 29 L of O₂ were consumed

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The molecular formula is C9H24O6

Given the Mass of C = 47.37g ,Mass of H = 10.59g and Mass of O = 42.04g

The total mass of these elements is 100g, taking a proportion of their molar masses.

C = 47.37/12= 3.95

H = 10.59/1 = 10.59

O = 42.04/16= 2.63.

Dividing with the smallest proportion which is 2.63

C=3.95/2.63 = 1.5

H =10.59/2.63 =4

O = 2.63/2.63= 1

Multiplying by 2 to get a whole number.

C = 1.5x2 = 3

H= 4x2 = 8

O = 1x2= 2

The empirical formula is C3H6O2

(Empirical formula)n= molecular mass

(C3H8O2)n =228.276

(12x3 +8+16x2)n= 228.276

76n = 228.276

n = 228.276/76

n = 3

Molecular formula = (Empirical formula)n

= (C3H8O2)3 = C9H24O6

The molecular formula is C9H24O6

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Answer:

See attached image.

Explanation:

The explanations are on the attachment.  The numerical results are below.

1.  63g/7cm^3 = 9 g/cm^3

2.  The m or mm must be converted so that the units are the same.  1 m = 1000 mm.  I'll convert the meters to mm:  0.080 m = 80 mm.

480 mm^2/80 mm = 6 mm

3.  L times L makes no physical sense, unless this is a new Star Wars technique for making dark matter.  Entertaining, but useless.

Answer:

13 Protons, 14 Neutrons, and 13 electrons.

Explanation:

See Picture Below

I have labeled all the numbers and the diagram.

I hope it helped

The molecular formula for the compound is [tex]C_{4} H_{8}[/tex] .

% of C = 79.85%

% of H = 20.15%

Let the mass of the compound be 100g, then

Mass of C = 70.85 g

Mass of H = 20.15 g

Molar mass = 60.15 g/mol

Moles of Carbon = [tex]\frac{79.85}{12.01 g/mol}[/tex]

                             = [tex]6.64 mol[/tex]

Moles of Hydrogen = [tex]\frac{20.15}{1.00794 g/mol}[/tex]

                                 = [tex]19.99 mol[/tex]

And we divide both sides by the lower quantity;

[tex]C_{\frac{6.64 mol}{6.64 mol} } H_{\frac{19.99 mol}{6.64 mol} }[/tex] ≅ CH₂

And [tex](empirical formula)_{n} = molecular formula[/tex]

60.15 g/mol = n × ( 12.01 + 2 × 1.00794)

n = 4

Therefore, the molecular formula for the compound is [tex]C_{4} H_{8}[/tex] .

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Increasing one charged particle by 16 will lead to increasing the electrical force between two charged particles by a factor of 16.

This is referred the attractive or repulsive interaction between any two charged bodies present.

F= kq1q2/r²

F1/F2= kq1q2/r² / 16kq1q2/r²

F1/F2 = 1/16

F2 = 16F1

This is therefore how to increase the electrical force between two charged particles by a factor of 16.

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Answer:

cooking an egg

Explanation:

Hope it works

Answer:

valeric acid

Explanation:

I don't know exactly. But try this one.

Answer:

IUPAC NAME: PENTANOIC ACID

COMMON NAME: VALERIC ACID

The relative atomic mass of x is 101 u.

Molar mass is calculated by adding the atomic mass of all the elements in a compound.

Molar mass of x(HCO₃) =162 g/mol

Atomic mass of H = 1 g/mol

Atomic mass of C =12 g/mol

Atomic mass of O = 16 g/mol

Therefore, molar mass of x(HCO₃) will be

= x + 1 + 12 + 3 x 16

We know that:

x + 1 + 12 + 3 x 16=162

x + 61 = 162

x = 101 g/mol

The relative atomic mass of x will be 101 u.

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110ml of the 40% alcohol mixture and pure water will  need to obtain the desired solution

Given that 0.30 * 440 = 132 mL of pure alcohol needed

132 mL = 0.40 * x mL of 0.4

x = 330 mL of 70%

440 - 330 = 110 mL of H2O

Water content differs

If you have 440 mL of a 30% alcohol mixture, then (440mL)*(0.30) = 132mL of that solution is alcohol.

Similarly, if you have x mL of a 40% alcohol mixture, then (x mL)(0.40) = 0.40x mL of that solution is alcohol.

When you combine these two liquids, you will have (440 + x) mL of liquid and you want it to be 40% alcohol.

Hence  110ml of the 40% alcohol mixture and pure water will  need to obtain the desired solution

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190 milliliters is the volume of a 0.92M nickel(II) chloride solution that contains 175 mmol of nickel(II) chloride (NiCI₂).

Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar Concentration. The S.I unit of Molarity is molar (M) or mol/L.

Molarity = [tex]\frac{\text{Number of moles}}{\text{Volume of solution (in L)}}[/tex]

Moles of nickel(II) chloride = 175 mmol

Molarity of the nickel(II) chloride = 0.92 M

Convert mmol into mol

1 milimol = 0.001 mol

175 mmol = 0.175 mol

Now put the value in above formula to find the volume of solution

Molarity = [tex]\frac{\text{Number of moles}}{\text{Volume of solution (in L)}}[/tex]

[tex]0.92\ M = \frac{0.175\ mol}{\text{Volume of solution}}[/tex]

Volume of solution = [tex]\frac{0.175\ mol}{0.92\ M}[/tex]

Volume of solution = 0.1902 L

Convert L into mL

1 L = 1000 mL

0.1902 L = 0.1902 × 1000 mL

              =  190.2 mL

              ≈ 190 mL

Thus from the above conclusion we can say that 190 milliliters is the volume of a 0.92M nickel(II) chloride solution that contains 175 mmol of nickel(II) chloride (NiCI₂).

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Calculate the volume in milliliters of a 0.92M nickel(II) chloride solution that contains 175 mmol of nickel(II) chloride (NiCI₂). Round your answer to significant digits.

Answer:

independent: amount of baking powder

dependent: the banana bread that it produces

constants: the amount of other ingredients/the other ingredients, the type of baking powder, rest of the baking process (heat, temperature, timing of steps), and who's tasting the bread.

Explanation:

The independent variable is the thing that we are directly changing.

We usually change this to test out differences between different amounts of this variable;

This variable is the "x" variable in a function or graph, if it helps you to think of it as that.

The dependent variable is the thing that changes because of the independent variable

Once again, if you think of a graph or function, this would be the "y" variable--it changes in relation to x

The constants are the things that stay the same no matter what the changing variables are

This element is key to an experiment--an experiment would be almost pointless without it. We need to see what is actually changing as a result of the independent and intentional changes.

Here's an example:

Let's say I want to test out how much condensation forms on a bottle based on the temperature of the liquid inside.

I will be changing the temperature of the liquid inside, meaning that this is the independent variable

I will be expecting/looking for a change in the condensation because of my change in the independent variable, meaning that this is the dependent variable

In my experiment, there are some things I need to make sure don't change, so that I can see the effect of my change in the temperature directly--perhaps I need to keep the same bottle shape and size, the same amount of liquid, the same location, the same type of liquid, the same amount of time I let it sit for, etc.  meaning that these are my constants.

So, with all of this in mind, let's take a look at our experiment given.

Here, I will be changing the amount of baking powder that I use, whilst observing the change in the banana bread that it directly produces.

There are a few things I must keep constant: the amount of the other ingredients, the rest of the baking process (heat/temperature, mixing time, etc.), and the type of baking powder I use

There is another consideration that I probably want to keep consistent: who is deciding the taste of the bread. If the person switches, then I might get a different opinion for the same recipe.

hope this helps! have a lovely day :)

Option 2 involves conducting an experiment to find the ideal amount of baking powder to add to a batch of banana bread.

The amount of baking powder served as the independent variable. The goal of this experiment is to determine the ideal amount of baking powder to use in each batch of banana bread.

Dependent Variable: The standard of banana bread served as the dependent variable. It is called the outcome you are measuring or observing in response to a change in the independent variable. In this instance it could be the taste, texture or texture of banana bread.

Constant: Some variables must remain constant throughout the experiment to ensure that only the independent variable has an effect on the dependent variable. Following are some possible constants in this experiment:

By holding these variables constant, you can isolate the effect of different amounts of baking powder on the quality of the banana bread and determine the exact amount needed for best results.

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An electron can be added to halogen atom to force a halide ion with 8 valence electrons

An atom can be defined as the smallest part of an element which can take part in a chemical reaction.

However whenever, an electron is added to halogen atom to force a halide ion with 8 different valence electrons

So therefore; an electron can be added to halogen atom to force a halide ion with 8 valence electrons

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Answer:

An endothermic reaction is a reaction where heat is taken in from the surroundings. This could be in the process of vaporisation from liquid to gas. However an exothermic reaction is when heat is given out to the surroundings. An example of this would be condensation gas to liquid!

Explanation:

Answer:

Fossil fuels contribute to greenhouse gases, which is one of their major disadvantages. The most harmful for the environment is coal because it has many more harmful combustion products than other fossil fuels.

Answer:

=> 1366.120 g/mL.

Explanation:

To determine the formula to use in solving such a problem, you have to consider what you have been given.

We have;

mass (m)     = 25 Kg

Volume (v) = 18.3 mL.

From our question, we are to determine the density (rho) of the rock.

The formula:

[tex]p = \frac{m}{v}[/tex]

First let's convert 25 Kg to g;

1 Kg    = 1000 g

25 Kg = ?

[tex]= \frac{25 × 1000}{1}[/tex]

= 25000 g

Substitute the values into the formula:

[tex]p = \frac{25000 g}{18.3 ml}[/tex]

= 1366.120 g/mL.

Therefore, the density (rho) of the rock is  1366.120 g/mL.

Answer:

I see "photosynthesis" and "cellular respiration". I wonder if photosynthesis has something to do with the sun.

Explanation:

The decay constant (in per sec) is  1.79* 10^ -9/sec

The rate of decay is 8.94 x 1010 nuclei/s. The number of nuclei in the sample is

The rate equation is rate = kNt. Solve for k.

An exponential function has a variable exponent, a positive base, and a base that is not equal to one.

For instance, F (x) = 4x is an exponential function since the exponent is set rather than variable.

Instead of being an exponential function, f (x) = x3 is a fundamental polynomial function.

The graphs of exponential functions are continuously curved and never reach a horizontal asymptote.

Several real-world phenomena are governed by exponential or logarithmic functions.

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Answer:

B. Optical

Explanation:

First, let's go through what isomerism is. Isomerism is the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism), as CH3OCH3 and CH3CH2OH, or in the arrangement of their atoms in space and therefore in one or more properties.  There are 5 types of structural isomerism. They are chain isomerism, position isomerism, functional group isomerism, metamerism, and tautomerism. This would mean that these types of structural isomerism that are in the options would be eliminated as the question ask which of the "following" is not a type of structural isomerism. This would leave the only option available which is Option B. Optical Isomerism. So instead of being a structural isomerism, it is a type of stereoisomerism. Stereoisomerism is the arrangement of atoms in molecules whose connectivity remains the same but their arrangement in space is different in each isomer.

Therefore, the answer is Option B. Optical.

Answer:

101325 pascal

Explanation:

i dont cap

Answer:

See below

Explanation:

1 atmosphere = 101 325 Pascals = 760 mm Hg = 14.6959 psi

The sentences describe the logistic growth model is when a population size reaches the carrying capacity of its environment, the population growth slows down or stops completely.

Logistic or sigmoidal growth involves exponential population growth followed by a steady reduction in population growth until the population size stabilizes, assuming an S-shaped curve.

In this case, we can say this affirmation is true for the S-curve, but not the J-curve.

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Answer:

5.01 x 10^-12

Explanation:

Formula [H+]=10^-ph 》》 10^-11.2

-Hope this helps!!

C₂H₆O is referred to the chemical formula corresponds to this structural formula and is denoted as option D.

This contains information about the chemical proportion of atoms present in a molecule.

In this scenario, there are two carbon atoms, six hydrogen atoms and one oxygen atom which can be written as C₂H₆O. This is therefore the most appropriate choice in this scenario.

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Answer: D.) C6H14

Explanation: i hope this helps (this is for another question you might have tho) :)

If an electron in an atom gains energy to go from a lower energy level to a higher energy level, it is called Excited energy state.

Ground state energy: The lowest energy state for an electron is called its ground state, which is the energy level it typically resides in. Each electron has a limit on how much energy it can have while still remaining a part of its atom. It is the most stable state of electron.

Excited state energy: An electron is in an excited state when it momentarily possesses an energy state higher than its ground state. If an electron receives additional energy, such as when it absorbs a photon, or packet, of light, or collides with an adjacent atom or particle, it can become excited. As these excited state energy level are unstable. So while coming back to ground state electrons emit radiations suitable wavelength.

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The limiting reagent will be Al

They are reagents that limit the quantity of products that are formed in reactions.

From the equation of the reaction:

[tex]4Al + 3O_2 --- > 2Al_2O_3[/tex]

The mole ratio of Al to O2 is 4:3.

With 2 moles of Al and 2 moles of O2, Al becomes limiting while O2 is in excess.

With 2 moles of O2, the amount of Al required should be:

                          2 x 4/3 = 2.67 moles.

With 2 moles of Al, the amount of O2 required should be:

                    2 x 3/4 = 1.5 moles

Thus, O2 is in excess by 0.5 moles.

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The mass of CoCl₂ is 6.515 g.

Given,

Molarity of the solute (CoCl₂) = 0.674 M

Volume of solution = 0.0750 L

Molecular weight of solute (CoCl₂) = 128.9 g/mol

Molarity formula is used to solve this question.

Molarity is defined as the number of moles of solute per liter of solution.

                     [tex]Molarity = \frac{number of moles }{volume (in L)}[/tex]             .......(i)

We know that,

            [tex]number of moles = \frac{weight of given solute }{molecular mass if the solute}[/tex]             ........(ii)

Put the above values in equation (i)

                       [tex]0.674 = \frac{number of moles}{0.0750}[/tex]

                   [tex]number of moles = 0.674 (0.0750)[/tex]

                   [tex]number of moles = 0.05055[/tex]

Put the number of moles in equation (ii)

                       [tex]0.05055 = \frac{weight of given solute}{128.9}[/tex]

                [tex]weight of given solute = 0.05055 (128.9)[/tex]

                [tex]weight of given solute = 6.515 g[/tex]

Therefore, 6.515 g of CoCl₂ is needed.

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Answer:

D. The amount of nitrogen dioxide and sulfur dioxide would increase.

Explanation:

Because the reaction is exothermic, heat is a product. According to Le Chaetelier's Principle, a system in equilibrium will adjust itself so as to relieve any stress placed upon it. If the temperature of the system increases, there are more products, and therefore the system is no longer at equilibrium. Thus, it will shift to favor the reactant side of the equation, where sulfur dioxide and nitrogen dioxide are located. This makes the answer D.

Edit: Brainly thinks that the correct spelling of 'Le Chaetelier' is a bad word so that's why it is spelled wrong lol.

Answer:

=> 1.0 M

Explanation:

The question is asking us to find the molarity of the acid (HCl).

We have been provided with;

We know that molarity (M) of a solution is contained in 1 L or 1000 mL or 1000 cm³.

This means that;

0.40 M is contained in 1000 mL.

X mol is contained in 25.0 mL

[tex] = \frac{25 \: \times \: 0.40}{1000} \\ = 0.01 \: moles[/tex]

These 0.01 moles is contained in 10 mL of HCl.

To find the molarity of the acid;

0.01 moles is contained in 10 mL

x mol is contained in 1000 mL

[tex]x \: mol \: = \frac{0.01 \times 1000}{10} \\ = 1.0 \: mol[/tex]

= 1.0 M

Therefore the molarity of the acid (HCl) is 1.0 M

The new volume of a sample of gas initially occupying a 500 mL container at a pressure of 1.4 atm and a temperature of 25 °C is 281.01mL.

The volume of a gas can be calculated using the following formula:

P1V1//T1 = P2V2/T2

Where;

1.4 × 500/298 = 2.7 × V2/323

2.348 × 323 = 2.7V2

758.72 = 2.7V2

V2 = 281.009mL

Therefore, the new volume of a sample of gas initially occupying a 500 mL container at a pressure of 1.4 atm and a temperature of 25 °C is 281.01mL.

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