Octane C8H18 is an ingredient in gasoline. How many carbon atoms are in 20 kg of octane? help please

Answer:

CaCO3: empirical.

C6H12O6: not empirical.

NaMnO4: empirical.

Ba3(PO4)2: empirical.

K2C2O4: not empirical.

Explanation:

Hello.

In this case, since the empirical formula of a chemical compound is the smallest whole number ratio of atoms of each element in the compound, for each compound we proceed as follows:

CaCO3: it is empirical since the subscripts there cannot be reduced anymore.

C6H12O6: not empirical since the smallest whole number ratio of atoms would be CH2O.

NaMnO4: it is empirical since the subscripts there cannot be reduced anymore.

Ba3(PO4)2: it is empirical since the subscripts there cannot be reduced anymore.

K2C2O4: not empirical since the smallest whole number ratio of atoms would be KCO2.

Best regards.

The chemical formula that are empirical and not empirical are:

A chemical compound's empirical formula is the smallest whole-number ratio of atoms of each element in the compound.

[tex]CaCO_3[/tex]: it is empirical since the subscripts there cannot be reduced anymore.

[tex]C_6H_{12} O_6[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]CH_2O[/tex]

[tex]NaMnO_4[/tex]: it is empirical since the subscripts there cannot be reduced anymore.

[tex]Ba_3(PO_4)_2[/tex]: it is empirical since the subscripts there cannot be reduced anymore.

[tex]K_2C_2O_4[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]KCO_2[/tex]

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Answer

65cm^3

Explanation

1mL=1cm^3

so; 65.0mL=65cm^3

Answer:

Commas are used to divide or separate parts of a sentence in order to make the meaning clear and the sentence easier to read. They mark a brief pause in the sentence, usually at a point where you would naturally pause if you were speaking rather than writing.

Explanation:

can i get brainly g?

-- At any given time, different parts of Earth experience different seasons.

-- At any given time, all parts of Earth experience the same season.  NOT

-- Summer occurs when sunlight reaches the northern or the southern hemisphere directly.

-- Summer Occurs when sunlight reaches the northern or the southern hemisphere indirectly.   NOT

-- When the southern hemisphere is tilted towards the sun, it receives more sunlight, so southern hemisphere experiences summer.

-- Winter occurs when sunlight reaches the northern or the southern hemisphere directly.  NOT

In other words, December in Australia is like June in the central and south USA, Mexico, Guatemala, Nicaragua, El Salvador, Honduras, and Costa Rica.

Different parts of the earth experience different seasons, and the summers are due to the tilt of the axis that causes sunlight to reach the hemisphere.

Seasons are the climatic variation due to the tilted axis of the planet that results in different amounts of sunlight reaching the planet.

The region facing and tilted towards the sun experiences summers as the sun rays are direct towards that region.

As the axis is tilted towards the southern hemisphere then the region will experience the summers season, unlike the northern hemisphere.

Therefore, different parts of the earth undergo different seasons.

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Answer:

Option B. 4.38 g

Explanation:

The following data were obtained from the question:

Half life (t½) = 20 mins

Original amount (N₀) = 70 g

Time (t) = 80 mins

Amount remaining (N) =.?

Next, we shall determine the decay constant. This can be obtained as illustrated below:

Half life (t½) = 20 mins

Decay constant (K) =.?

Decay constant (K) = 0.693/ half life (t½)

K = 0.693/20

K = 0.03465 min¯¹

Finally, we shall determine the amount remaining after 80 mins as follow:

Original amount (N₀) = 70 g

Time (t) = 80 mins

Decay constant (K) = 0.03465 min¯¹

Amount remaining (N) =.?

Log (N₀/N) = kt/2.303

Log (70/N) = (0.03465 × 80)/2.303

Log (70/N) = 2.772/2.303

Log (70/N) = 1.2036

Take the anti log of 1.2036

70/N = antilog (1.2036)

70/N = 15.98

Cross multiply

70 = N × 15.98

Divide both side by 15.98

N = 70/15.98

N = 4.38 g

Therefore, the amount of the isotope remaining after 80 mins is 4.38 g

answer and explnation on the picture if you have any quation let me know  

Answer:

Explanation:

Direct Relationship - a mathematical relationship between two physical variables that depend upon one another such that when one variable increases the related variable also increases.

Example - For an enclosed gas it is observed that an increase in temperature (T) also results in an increase in pressure (P). Such is represented as P ∝ T which reads pressure (P) is directly related (or, proportional) to temperature (T). This does not mean that the variables temperature and pressure are equal, only that when one increases or decreases the other variable also increases or decreases proportionally.

Problems in Gas Laws relating pressure and temperature is typically referred to as The Gay-Lussac Law. Empirically it is represented by  T₁/P₁ = T₂/P₂. Assume problem is given an enclosed gas at 25⁰C(= 298K*) and 750mm pressure. What is the pressure (P₂) if the temperature is increased to 35⁰C(= 308K)? and to 45⁰C(= 318K)?

*(Note: Problems in the empirical gas laws need to be worked in degrees Kelvin.)

T₁ = 25⁰C = 298K; P₁ = 750mm

T₂ = 35⁰C = 308K; P₂ =   ?

T₃ = 45⁰C = 318K; P₃ =  ?

T₁/P₁ = T₂/P₂ => P₂ = T₂·P₁/T₁ = 308K x 750mm / 298K = 775.17mm Pressure.

For P₃ calculation, one can work from either T₁,P₁ data or T₂,P₂ data.

This calculation chooses T₁,P₁ data.

T₁/P₁ = T₃/P₃ => P₃ = T₃·P₁/T₁ = 318K x 750mm / 298K = 800.34mm Pressure.

You apply T₂/P₂ = T₃/P₃ and you will find the same results for pressure.

Note that increasing temperature results in increasing pressure. This is 'direct relationship' analysis.

Dependent Variable & Independent Variable - The 'Dependent Variable' in a mathematical relationship  'Depends' upon an 'Independent Variable' which is chosen by the observer in order to determine the Dependent Variable. In the above problem, P is the dependent variable and T is the independent variable or, the variable the observer chooses to apply to the problem. Increases in Temperature (T) are chosen by observer to determine the Pressure (P). Increasing temperature (independent variable)  results in increasing pressure (dependent variable).

Inverse Relationship - a mathematical relationship between two physical variables that depend upon one another such that when one variable increases the related variable decreases.

Example: A gas confined in a cylinder with a movable piston starting at Volume-1 (V₁) and at Pressure-1 (P₁) is changed to Volume-2 (V₂)  will show a pressure value opposite to the direction of change (increased or decreased) to that of the volume change.

Problems in Gas Laws relating pressure and volume are typically referred to as Boyles Law problems. Empirically it is represented by  V₁·P₁ = V₂·P₂. Assume problem is given an enclosed gas at 255ml and 750mm pressure. What is the pressure (P₂) if the volume is increased to 425ml? (Similar to pulling the plunger out of a syringe to increase volume.)

V₁ = 255ml; P₁ = 750mm

V₂ = 425ml; P₂ =   ?

Using the Boyles Law relationship P₁V₁ = P₂V₂ => P₂ =  P₁V₁ /V₂

P₂ = (750mm)(255ml)/(425ml) = 450mm

Note P₂ has a decreased pressure value which is opposite in direction to the change in the independent variable, volume-2 (V₂). That is, an increase in volume (V) resulted in a decrease in pressure (P).

Cyclic Change - Change that is repetitive or repeats within a noted (given) time interval. Weather change is cyclic in that fall => winter => spring => summer => fall => winter => etc.  

Dynamic Equilibrium - In order to understand 'Dynamic Equilibrium' one must also define 'Static Equilibrium'. Static Equilibrium is when an object is not moving such as a marble sitting undisturbed on a level surface. All forces up, down, left & right are all equal. Dynamic Equilibrium is when an object is in motion at a constant speed on a level surface. All forces are also balanced forward, reverse, up & down. The term Dynamic Equilibrium is also applied to chemical reactions which means the rate of production of product is equal to the rate of production of reactant. This is typically represented by the equation  Reactants ⇄ Products. the double arrow indicates a steady state condition of dynamic equilibrium.

Explanation:

no.A (He) I think.............

Explanation:

since it has been accelerated to 5℅ of the sleec of light then

v= 5/100 × (3× 10^8)

after getting velocity you'll substitute the values in the formula

de Broglie wavelength= h/mv

don't forget to change the grams in mass to kg

aorry I don't hav my calc with me

Answer:

A) is best answer and would be 5250mg

Explanation:

Answer:

No, the metal is not pure gold because density is equal to mass divided by volume and in this case we end up with about 15.3, making this metal less dense than gold.

Explanation:

The definition of density allows to find the answer of whether the metal is gold:

Density is defined as the mass of a body divided by its volume, it is a very important physical characteristic of the body since it is invariant.

           [tex]\rho = \frac{m}{V}[/tex]

Where ρ is the density, m the mass and V the volume

They indicate that the object's mass is 980 g and it has a volume of 64 cm³, ask if it is made of pure gold.

The systems of units are systems of measurements to exchange magnitude without inconveniences, the most used system is the intentional system of measurements (SI), we re-educate the magnitudes to this system

                m = 980 gr ([tex]\frac{1kg}{1000g}[/tex] ) = 0.980 kg

                V = 64 cm³  [tex]( \frac{1m}{100 cm} )^3[/tex] = 64 10⁻⁶ m³

let's find the density of the object

            ρ = [tex]\frac{0.980 }{64 \ 10^{-6} }[/tex]  

            ρ = 15.3 10³ kg/m³

The tabulated gold density  is 19.3 10³ kg/m³

We can see that the density for the body is less than the gold density.

In conclusion with the definition of density we can find the answer for if the metal is gold is:

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Answer: soil

Explanation:

Soil is composed of various substances in varying proportion.

An example of a heterogeneous mixture is soil as it composed of different phases while all the other 3 substances are composed of single phase.

Heterogeneous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogeneous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogeneous mixtures are distinctly visible . There are two types of heterogeneous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

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#SPJ2

Answer:

Shale

Explanation:

Answer: Shale

Explanation:

Answer:

I guess you just answered a lot of questions

Explanation:

Thanks for the points btw :)

Answer:

Congatulations I am never gonna make it up there OMEGALUL

Explanation:

Answer:

h = 3.125 cm

Explanation:

We are given;

Width; w = 5 cm

Length; l = 8 cm

Mass; m = 150 g

Density;ρ = 1.2 g/mL

Formula for buoyant force is

Fb = ρgV = ρghA

Now, V is volume and it is given by;

V = mass/density = 150/1.2

V = 125 mL

Converting to cm³ gives; V = 125 cm³

Thus:

Since ρgV = ρghA

ρ and g will cancel out to give;. V = hA

h is the displaced liquid

A is Area = width × length = 5 × 8 = 40 cm².

Thus; 125 = 40h

h = 125/40

h = 3.125 cm

Answer:

3.75 cm

Explanation:

You can divide the boat's mass by the product of width x length.

8cm x 5cm = 40

150/40 =

3.75

Answer:

the final pressure (108.03 mmHg ) inside the container at 339 K is more than the vapor pressure of liquid octane (100 mmHg) at 339 K.

Hence,

b. Some of the vapor initially present will condense.

e. Liquid octane will be present.

Explanation:

Given that;

The vapor pressure of liquid octane, C8H18, is 100 mm Hg at 339 K

Initial volume of the container, V1 = 537 mL

Initial vapor pressure, P1 = 68.0 mmHg

Final volume of the container, V2 = 338 mL

Let us say that the final vapor pressure = P2  

From Boyle's law,

P2V2 = P1V1

P2 * 338 = 68.0  * 537

338 P2 = 36516

P2 = 36516 / 338

P2 = 108.03 mmHg

Thus, the final pressure (108.03 mmHg ) inside the container at 339 K is more than the vapor pressure of liquid octane (100 mmHg) at 339 K.

Hence,

b. Some of the vapor initially present will condense.

e. Liquid octane will be present.

Answer:

69

Explanation:

We define science as the knowledge that seeks to understand truths or natural laws to explain .

In the most specific sense of the word, science is that type of knowledge that seeks to understand truths or natural laws to explain the functioning of things and the universe in general.

The concept of science can be defined as a body of systematized knowledge acquired through observation, identification, research and explanation of certain categories of phenomena and facts, and formulated methodically and rationally.

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Answer:

Science is the acquisition of our own knowledge through experimentation to explain and describe natural phenomena.

Explanation:

Science comes from the Latin word, Scientia, which means knowledge. Knowledge are facts that can be verified.

Answer:

x = 4.73

Explanation:

Given

y = 0.14x - 0.0398

Required

Find x when y = 0.622

To do this, we first substitute 0.622 for x.

y = 0.14x - 0.0398 gives

0.622 = 0.14x - 0.0398

Solve for 0.14x

0.14x = 0.622 + 0.0398

0.14x = 0.6618

Solve for x

x = 0.6618/0.14

x = 4.7271428571

x = 4.73 approximated

Answer:

X = 10

Explanation:

First, we need to calculate the moles of Na₂CO₃ in  the 0.948g. Then, the moles of water based on the difference of masses. X will be the ratio of moles of water and moles of sodium carbonate.

Moles Na₂CO₃ (Molar mass: 105.99g/mol):

0.948g * (1mol / 105.99g) = 8.944x10⁻³ moles

Moles H₂O (Molar mass: 18.02g/mol):

2.558g - 0.948g = 1.61g of water

1.61g * (1mol / 18.02g) =0.08935 moles

The ratio, X, is:

0.08935mol / 8.944x10⁻³ moles

Answer:

Atomic number

Explanation:

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

The Modern periodic table is organized on the basis of increasing atomic Number.

Answer:

d

Explanation:

the endothermic reaction absorbs heat and exothermic emits heat. If we think of this from increasing the temperature, exothermic already emits heat so it would favor an endothermic reaction. In this instance, a decrease in temperature would do the opposite, which would favor the exothermic reaction.

Answer:

The Electron Configuration for Phosphorus is = 1s^2  2s^2  2p^6  3s^2  3p^3

Explanation:

Here is a sheet of paper that might help you out. You follow the red lines and where it has 3p^6 is if it is a full set. If you count the number that all of those are raised to, then you should get 15 (which is the atomic number).

Sorry, if it is horizontal instead of vertical.

Answer: Because heat rises and it also makes the water bubble up which creates more height.

Explanation:

Answer Liquid on the bottom of the pot closest to the heat source starts to get hot; as that happens, it rises. The rising hot water is replaced by the cooler, more dense water molecules.

Explanation:

Answer: 38 km =  38000 meters

Explanation:

1 km = 1000 meters

38 km= 38000 meters

Answer:

24.6

Explanation:

Answer:

There are 0.81 moles in an iron nail having mass of 4.58 grams..