uhh ill give brainliest??

Answer:

40$$$

Explanation:

Reason: 300 miles × 1gallon30miles × $4.001gallon = $40

Answer:

89.1942....

Explanation:

abundance x mass on each one, the added all together:

77.742+6.201+5.251

Answer:

d) none of the above

Explanation:

The law that describes the relationship between pressure and volume of an ideal gas (under constant temperature and amount of substance) is Boyle's law.

It states that pressure is inversely proportional to the volume. This would mean that a graph of P vs 1/V would be a line.

See the attached picture for a graph of P vs V.

A plot of pressure VS. volume for an ideal gas will result in d) none of the above

The following things should be considered:

Therefore we can conclude that a plot of pressure VS. volume for an ideal gas will result in d) none of the above

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Answer:

0.9 g (approximately)

Explanation:

Answer:

Explanation:

1) The ΔH shows the heat of reaction of the reaction illustrated in the question and the negative sign shows the reaction is an exothermic reaction, meaning heat is released in this reaction. The amount of heat released in this reaction is 851.5 kilojoules per mole of Al₂O₃ produced.

2) The thermal energy of this reaction is however very low when compared to the energy released when 2 moles of protons and 2 moles of neutrons combine to form 1 mole of alpha particles. This is because, the reaction illustrated in the (1) above is a normal chemical reaction while the one that involves the protons and neutrons (as described in this section 2) is a nuclear reaction which involves large amount of energy. Nuclear reactions usually involve way larger amount of energy than ordinary chemical reactions.

Answer:

boron aluminum gallium indium

Explanation:

hope this helps you

Moving material along certain gradients is necessary for osmosis, diffusion, filtration, and the transport of ions away from similar charges.

Osmosis is the flow of solvent molecules over a semi-permeable membrane from an area of lower concentration to a region of higher concentration Molecules diffuse when they travel from one area of higher concentration to another area of lower concentration The process of filtering involves moving liquid substances through a separating material known as a filter in order to separate solid particles from liquid. Due to the difference in pressures between the solid and liquid substances, this process is made feasible. Because of the difference in electrical potentials between the charges, ions move away from like charges.

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Taking into account the definition of density, the mass of grlycerol required is 3.9816 g.

Density is a quantity that is defined as the measurement of the amount of mass in a given volume of a substance.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

You can observe that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

1.26 g/cm³= mass÷ 3.16 cm³

Solving:

mass= 1.26 g/cm³  ×3.16 cm³

mass= 3.9816 g

In summary, the mass of grlycerol required is 3.9816 g.

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Answer:

2:1

Explanation:

Water molecules feature the combinations of hydrogen and oxygen atoms in a 2:1 ratio.

Yes, the more air that can get under the wings the longer the airplane will stay airborne increasing the chances it will fly farther.

It is an independent variable that doesn't alter as a result of the other variables you're attempting to assess. An independent variable could be something like a person's age. Other aspects of a person's life, like as what they eat, how much they attend school, or how much television they watch, won't alter their age.

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Answer:

I got

−

902 kJ

for the reaction as-written. How would you rewrite this into

kJ/mol NH

3

?

The standard molar enthalpy of formation is for the formation of

1 mol

of product from its elements as they exist in nature at

25

∘

C

and

1 atm

. For example...

1

2

N

2

(

g

)

+

3

2

H

2

(

g

)

→

NH

3

(

g

)

,

Δ

H

∘

f

(

NH

3

(

g

)

)

=

−

45.9 kJ/mol

But that also means formation of elements in their standard states must yield zero enthalpy change:

1

2

O

2

(

g

)

→

1

2

O

2

(

g

)

,

Δ

H

∘

f

(

O

2

(

g

)

)

=

0

That means we can simply derive from Hess's law and that fact to get:

Δ

H

∘

r

x

n

=

∑

P

n

P

Δ

H

∘

f

,

P

−

∑

R

n

R

Δ

H

∘

f

,

R

where

n

indicates the mols of product

P

or reactant

R

. Here we actually have just summed many formation reactions together that we know have

Δ

H

∘

r

x

n

=

Δ

H

∘

f

.

Here we have:

Δ

H

∘

r

x

n

=

[

4 mols NO

(

g

)

⋅

Δ

H

∘

f

,

N

O

(

g

)

+

6 mols H

2

O

(

g

)

⋅

Δ

H

∘

f

,

H

2

O

(

g

)

]

−

[

4 mols NH

3

(

g

)

⋅

Δ

H

∘

f

,

N

H

3

(

g

)

+

0 kJ/mol

]

where we have set a zero contribution

O

2

(

g

)

right off the bat.

=

[

4 mols NO

(

g

)

⋅

91.3 kJ/mol

+

6 mols H

2

O

(

g

)

⋅

−

241.8 kJ/mol

]

−

[

4 mols NH

3

(

g

)

⋅

−

45.9 kJ/mol

+

0 kJ/mol

]

=

[

−

1085.6 kJ

]

−

[

−

183.6 kJ

]

=

−

902 kJ

for the reaction as-written.

Explanation:

Answer:

carbohydrates, lipids, proteins, and nucleic acids.

Explanation:

Carbohydrates serve several key functions in your body. They provide you with energy for daily tasks and are the primary fuel source for your brain's high energy demands.

The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. Lipids have applications in the cosmetic and food industries as well as in nanotechnology.

Protein has many roles in your body. It helps repair and build your body's tissues, allows metabolic reactions to take place and coordinates bodily functions. In addition to providing your body with a structural framework, proteins also maintain proper pH and fluid balance.

The functions of nucleic acids have to do with the storage and expression of genetic information. Deoxyribonucleic acid (DNA) encodes the information the cell needs to make proteins. A related type of nucleic acid, called ribonucleic acid (RNA), comes in different molecular forms that participate in protein synthesis.

Answer: Magnesium

Magnesium, in its elemental form, has 12 protons and 12 electrons. The neutrons are a different matter. Magesium's average atomic mass is 24.305 atomic mass units, but no magnesium atom has exactly this mass.

Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!! :D

Answer:

4.67 atm

Explanation:

Step 1: Given data

Step 2: Convert "T" to Kelvin

We will use the following expression.

K = °C + 273.15

K = 27.0 °C + 273.15 = 300.2 K

Step 3: Calculate the moles of Ar

The molar mass of Ar is 39.94 g/mol.

4.73 g × 1 mol/39.94 g = 0.118 mol

Step 4: Calculate the partial pressure of Ar

We will use the ideal gas equation.

pAr × V = nAr × R × T

pAr = nAr × R × T / V

pAr = 0.118 mol × (0.0821 atm.L/mol.K) × 300.2 K / 2.00 L

pAr = 1.45 atm

Step 5: Determine the total pressure of the gaseous mixture

The total pressure of the gaseous mixture is equal to the sum of the partial pressures of the individual gases.

P = pAr + pHe = 1.45 atm + 3.22 atm = 4.67 atm

Answer:

In a climatological sense, dryness is a function of both annual rainfall and evaporation

Answer:

Yeast is living.

Explanation:

Yeast is a type of fungus used in making bread. Fungus is a group of living organisms.

Answer:

  (C)  15,000

Explanation:

The equation is ...

  CS₂ +3O₂ ⇒ CO₂ +2SO₂

This indicates 1 molecule of CS₂ combines with 3 molecules of O₂ to produce 1 molecule of CO₂ and 2 molecules of SO₂.

Counting molecules, we see that the original 4 molecules in a 1:3 ratio become 1+2 = 3 molecules. The reactants present are in the necessary 1:3 ratio of CS₂ : O₂, so there are no limitations on the reaction. It can use all of the original molecules to produce ...

  (3/4)(20,000) = 15,000

molecules of product.

When the reaction completes, there will be 15,000 molecules present.

Answer: liver and pancreas

Explanation:the pancreas makes insulin and the liver makes liquid to break down the food

Answer:

3) pancreas and liver.........

op. c 10 is ur ans

HOPE THIS HELPS!!

Answer:

11 amu=Protons+Nuetrons the actual amu in the period table is 10.8

Explanation:

amu is Protons + nuetrons (5+6) = 11

This can be crossed checked with a periodic table where it has a amu of 10.8 which can be rounded up to 11.

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Explanation:

The concentration of Bovine Hb with absorbance 0.7 at 570 nm has been 2.264 [tex]\mu[/tex]M.

According to Beer's law, the absorbance of the sample can be given by:

Absorbance = Extinction coefficient [tex]\rm \times[/tex] concentration [tex]\times[/tex] path length

The Bovine Hb has the extinction coefficient = 30910 L/mol/cm

The absorbance = 0.7

The path length has been 1 cm.

The concentration of the Bovine Hb can be given as:

0.7 = 30910 [tex]\times[/tex] concentration [tex]\times[/tex] 1

The concentration of Bovine Hb = 2.264 [tex]\rm \times\;10^-^6[/tex] moles/L

The concentration of Bovine Hb = 2.264 [tex]\rm \mu[/tex]moles/L

The concentration of Bovine Hb = 2.264 [tex]\mu[/tex]M.

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Which statement describes how the binary ionic compound KBr is named? The metal is named first, and the name is unchanged. Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?

B. The metal is named first and the name is unchanged.

Explanation:

conjugate acid/base pairs are compounds which differ by the hydrogen ion (H⁺)

The conjugate based is formed when an acid donates a proton.

HSO₄⁻   --> H⁺   +  SO₄²⁻

The conjugate base of HSO₄⁻    is SO₄²⁻

The conjugate acid is formed when a base accepts a proton.

HSO₄⁻    +  H⁺  --> H₂SO₄

The conjugate acid of HSO₄⁻    is H₂SO₄

Answer:

76.1%

Explanation:

The reaction that takes place is:

First we determine how many moles of each reactant were added:

Thus K₂SO₄ is the limiting reactant.

Using the moles of the limiting reactant we calculate how many moles of BaSO₄ would have been produced if the % yield was 100%:

Then we convert that theoretical amount into grams, using the molar mass of BaSO₄:

Finally we calculate the % yield:

Answer:

It loses electrons.

Explanation:

When an atom is oxidized in a redox reaction, it simply loses electrons and the oxidation number increases.

An oxidized atom implies that oxidation has occurred; oxidation can be defined as:

D. It loses electrons

Here's how it works!

Oxidation occurs when an atom, molecule, or ion loses one or more electrons. In the process of oxidation, the oxidation state of the chemical species increases. Originally, the term was used to describe when oxygen caused electron loss in reactions. I hope that helps you!

Answer:

0.01932 L

Explanation:

First we convert 105 mM to M:

Next we convert 552 mL to L:

Then we use the following equation:

Where:

We input the given data:

And solve for V₁:

Answer:

P₂ = 2.60 atm

Explanation:

Given data:

Initial pressure = 2.38 atm

Initial temperature = 25.0 °C

Final pressure = ?

Final temperature = 52.78°C

Solution:

Initial temperature = 25.0 °C (25.0+273 = 298 K)

Final temperature = 52.78°C (52.78+273 = 325.78 K)

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

2.38 atm / 298 K = P₂/325.78 K

P₂ = 2.38 atm × 325.78 K  / 298 K

P₂ = 775.35 atm. K /293 K

P₂ = 2.60 atm

Answer:

Explanation:

The altitude is irrelevant, except as needed to define the pressure. In this example all three parameters of the Ideal Gas Laws are changing. We set up the equation to solve for the desired final volume. Start with the Ideal Gas Law:

P

⋅

V

=

(

n

⋅

R

⋅

T

)

where the number of moles of gas and the gas constant do not change.

(

P

V

T

)

1

=

(

P

V

T

)

2

Rearrange for the desired

V

2

, Temperatures must be in ‘K: 298 & 283.

(

P

1

V

1

T

1

)

×

T

2

P

2

=

V

2

V

2

=

P

1

×

V

1

×

T

2

T

1

×

P

2

V

2

=

730

×

855

×

283

298

×

605

=

980

L

“Change” in volume is

980

–

855

=

125

L

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