Given the reaction: 2Na + 2H2O --> 2NaOH + H2 How many moles of Na are needed to produce exactly 5.6 liters of H2, measured at STP?

Explanation:

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From the calculations performed, the free energy change for the reaction is 72 kJ/mol.

The equilibrium constant is a value that shows the extent to which reactants have been converted to products.

Given that the equation of the reaction is;

3CH4(g)→C3H8(g)+2H2(g)

Then;

PC3H8 = 0.013 atm

PH2 =  2.3×10−2 atm

PCH4 = 41 atm

Now;

ΔG = ΔG° + RTlnQ

ΔG°reaction = ΔG°products - ΔG°reactants

ΔG°reaction = [( -23.4) +2(0)] - 3(-50.8)

ΔG°reaction = 129 kJ/mol

Q = PC3H8 * PH2^2/PCH4^3

Q = 0.013 * (2.3×10−2)^2/( 41)^3

Q = 6.877 * 10^-6/68921

Q= 9.9* 10^-11

Hence;

ΔG = 129 * 10^3  + [8.314 * 298 * (ln  9.9* 10^-11 )]

ΔG = 129 * 10^3 - 57073

ΔG = 72 kJ/mol

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The structure of the alkyl bromides used in a malonic ester synthesis of ethyl 2-methyl-4-pentenoate are as drawn in the attached image.

The malonic ester synthesis is a chemical reaction characterized by the alkylation of diethyl malonate or a similar ester of malonic acid at the carbon alpha (directly adjacent) to both carbonyl groups, and subsequently converted to a substituted acetic acid.

Hence, it follows from the structure of Ethyl 2-methyl-4-pentenoate that the alkyl bromides used are Ethyl bromide and methyl bromide.

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Alkyl bromide is a compound that contains a halogen atom in alkane based structure. The structure of the alkyl bromides is attached in the image below.

Malonic ester synthesis is the alkylation of an ester of malonic acid or diethyl malonate at alpha carbon and is converted to substituted acetic acid.

In malonic ester synthesis of ethyl 2-methyl butanoate, ethyl bromide and methyl bromide are the alkyl bromides used and their images are attached below.

Therefore, alkyl bromides used in the synthesis are ethyl bromide and methyl bromide.

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Answer:

The final temperature of the sample is 21.004 °C

Explanation:

The molar heat capacity for iron is 25.130 J/g.c joules per gram per Kelvin.

The amount of heat needed to increase one temperature of one mole of a substance is called molar heat capacity.

By the formula [tex]\rm \Delta T^\circ c = \Delta Tk[/tex]

Given that c = 0.45 J/g.C

Molar mass of iron is 55.845

Then putting the values in the equation

[tex]c= 0.45 \times 55.845 \\\\c= 25.130 \;J/g.^\circ c[/tex]

Thus, the molar heat capacity for iron is 25.130 J/g.c

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Answer:

Organelles are structures within a cell that perform specific functions like controlling cell growth and producing energy. Plant and animal cells can contain similar types of organelles. However, certain organelles can only be found in plant cells and certain organelles can only be found in animal cells.

Entropy is commonly understood as the system's degree of disorder or unpredictability. The correct option is, (C) (iii) only

Entropy is a thermodynamic number that represents the inability of a system's thermal energy to be converted into mechanical work and is commonly understood as the system's degree of disorder or unpredictability.

The degree of unpredictability of a molecule rises when it transitions from a solid to a liquid state. As a result, the entropy will rise.

Similarly, when we move from a liquid to a gaseous state, the unpredictability of the molecule increases. As a result, the entropy will rise.

However, as we progress from gas to liquid to solid, the degree of molecular randomization reduces. As a result, the entropy will decrease.

Or, to put it another way, the higher the number of moles in a product, the higher the entropy.

(i) [tex]N_2(g)+3H_2(g) \rightarrow 2NH_3(g)[/tex]

Entropy falls in this reaction because the number of moles on the product side is fewer than the number of moles on the reactant side.

(ii) [tex]C_{10}H_8(g) \rightarrow C_{10}H_8(s)[/tex]

Entropy lowers in this process because the degree of randomness of the molecules diminishes as we move from a gas to a solid-state.

(iii) [tex]CH_3OH(l)\rightarrow CH_3OH(aq)[/tex]

Because the methanol liquid dissociated into ions, the number of moles present on the product side is more than the number of moles present on the reactant side, entropy rises in this reaction.

Hence, the correct option is, (C) (iii) only.

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Explanation:

A carbon radical is a reaction intermediate, which is produced during a free-radical reaction. These carbon radicals contain one unpaired electron on a carbon atom. Hence, these radicals are highly reactive in nature.

A free-radical reaction results in the production of a carbon radical as a reaction intermediate.

A radical in chemistry is indeed an atom, molecule, and ion that possesses one least one unpaired electron electron. The term "radical" is sometimes used to refer to a free radical. These unpaired electrons provide radicals, with a few exceptions, a high degree of chemical reactivity. Radicals frequently dimerize on their own. The majority of organic radicals have brief lives.

A free-radical reaction results in the production of a carbon radical as a reaction intermediate. One unpaired electron is present on the carbon atom in these radical forms of carbon. As a result, the nature of these radicals is very reactive.

Therefore, a free-radical reaction results in the production of a carbon radical as a reaction intermediate.

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The model that should show the corresct representation of xenon gas is one in which the gas molecules  are isolated and monoatomic.

A noble gas is a member of group 18 of the periodic table. Noble gases are known not to interact with each other and occur as monoatomic particles.

The images are not shown here hence the question is incomplete. However, we do know that any of the models that show individual monoatomic particles is a representation of xenon gas.

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Answer:

the heat flows from the hand to the ice cream

Explanation:

we produce body heat therefore it moves to the ice cream also there is no possible way the heat could move from the ice cream because the ice cream is cold

Heat flows from the hand to the ice cream. Therefore, the correct option is option B among all the given options.

When the temperature rises, a type of energy called thermal energy is produced. The amount of thermal energy usually directly inversely proportional to the object's change in temperature. Thermal energy takes the form of heat. The thermal energy of a substance increases with temperature.

The quicker movements of the substance's atoms and molecules are what cause thermal energy to rise as temperature rises. In some cases, a substance's molecules will separate from one another and leave because the temperature has such high. Unexpectedly, thermal energy also affects the states of matter. Heat flows from the hand to the ice cream.

Therefore, the correct option is option B.

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Answer:

the correct answer is going to be the school

Answer:

coefficient green : 2.4865

exponent (yellow) : 16

Explanation:

Answer:

Carbon dioxide

Explanation:

The reaction is given by

CO2 is a harmful gas also responsible for the global warming and air pollution

When coal is burnt in the presence of excess air, some of the gases produced include carbon dioxide, oxides of nitrogen, and sulfur dioxide.

When coal is burnt in the presence of a lot of air, a variety of gases are produced: These include:

Aside from carbon dioxide, other gases depend on the content of coal.

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Answer:

Pb(NO

3

)

2

+

2

KI

→

PbI

2

+

2

KNO

3

Explanation:

Answer:

0.14 liters nitric acid

Explanation:

Molarity = moles / liter

7.0 M = x / 0.03 L

= 0.21 moles NaOH

0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3

Molarity = moles / liter

1.5 M  = 0.21 moles / x

x = 0.21 moles / 1.5 M

x = 0.14 Liters HNO3

Answer:

[tex]140mL[/tex]

Explanation:

[tex]M_1V_1=M_2V_2[/tex]

[tex]M_1=1.5M[/tex] molarity of nitric acid

[tex]V_1=?[/tex]  volume of nitric acid

[tex]M_2=7.0M[/tex] molarity of sodium hydroxide

[tex]V_2=30.0mL[/tex] volume of sodium hydroxide

[tex](1.5M)(V_1)=(7.0M)(30.0mL)[/tex]

[tex]V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL[/tex]

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Answer:

it expands

Explanation:

Answer:

a) it expands.

Explanation:

Water is more dense when it is a liquid, and less dense as a solid. This is why ice floats above water.

Hence, Ice expands when it freezes.

Answer: 0.5 M

Explanation:

molarity is defined as [tex]\frac{mol}{L}[/tex]

in the question, we are already given the amount of moles of Ba+ and L of water. we can just plug it into the equation, [tex]\frac{1}{2}[/tex].

thus, the molarity will be 0.5 M

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Answer:

With the European Climate Law, the EU committing to carbon neutrality by 2050. What does that mean in practice?

Climate change is already affecting the entire world, with extreme weather conditions such as drought, heat waves, heavy rain, floods and landslides becoming more frequent, including in Europe. Other consequences of the rapidly changing climate include rising sea levels, ocean acidification and loss of biodiversity.

In order to limit global warming to 1.5 degrees Celsius – a threshold the Intergovernmental Panel for Climate Change (IPCC) suggests is safe – carbon neutrality by mid-21st century is essential. This target is also laid down in the Paris agreement signed by 195 countries, including the EU.

In December 2019, the European Commission presented the European Green Deal, its flagship plan that aims to make Europe climate neutral by 2050. This target will be reached through the European Climate Law that sets climate neutrality into binding EU legislation.

Explanation:

ok bet i got u

As the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.

Boyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.

Boyle's law is expressed as;

P₁V₁ = P₂V₂

Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.

Given the data in the question;

We substitute our given values into the expression above to find the final volume.

P₁V₁ = P₂V₂

[tex]V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{4.1atm \ *\ 5.0*10^{-6}L}{1.0atm}\\ \\V_2 = \frac{4.1 \ *\ 5.0*10^{-6}L}{1.0}\\\\V_2 = 2.05*10^{-6}L\\\\V_2 = 0.021mL[/tex]

Therefore, as the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.

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Answer:

The answer is B which is 40

From the calculations and the data presented, the total volume in the flask is 100cm^3

A neutralization occurs between an acid and a base to yiled salt and water only.

The reaction equation here is; HCl + NaOH -----> NaCl + H2O. Now, the volume of HCl used is obtained from;

2 * 20 * 1/0.5 * 1 = 80 cm^3

Total volume in the flask =  80 cm^3 + 20cm3 = 100cm^3

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Answer:

Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate. Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.

Explanation:

:)

Explanation:

Ethanoic acid is a weak acid and dissociates:

C

H

3

C

O

O

H

⇌

C

H

3

C

O

O

−

+

H

+

For which

K

a

=

[

C

H

3

C

O

O

−

]

[

H

+

]

[

C

H

3

C

O

O

H

]

=

1.8

×

10

−

5

Please remember that these are equilibrium concentrations .

p

K

a

=

−

log

K

a

=

−

log

[

1.8

×

10

−

5

]

=

4.74

n

=

c

×

v

∴

n

C

H

3

C

O

O

H

=

0.20

×

200.0

1000

=

0.04

Answer:

Explanation:

15 moles of NaCl will be obtained from 15 moles of Na.

Answer:

300

Explanation:

because it's not highly concentrated

Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

An element is a substance or material that cannot be affected by an external substance or cannot be broken down by any reaction.

Metal wire is serving as an element, it should not be easily broken or penetrated as an insulator.

Therefore, Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

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✥ So, in 1.25 moles of NO2, you would have 1.25 moles of N and (2 x 1.25) 2.50 moles of O.

0.1 mole = Avogadro's number of particles (approx. 6.022x10^23 particles/mol)

So, #oxygen atoms = 2.50 mol x 6.022x10^23 atoms/mol

6.022x10^23 atoms/molOr, approximately 1.51x10^24 oxygen atoms.

Hope this answer helps you ✨

The Coriolis effect is a natural phenomenon in which objects appear to be deflected as they travel around and above the Earth. The Earth is always rotating, or spinning, from west to east. It completes a full rotation every 24 hours. The Coriolis effect is caused by this rotation.

Some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.

Hydrocarbons are any organic compounds that contain hydrogen and carbon in its structure.

Hydrocarbons can be grouped into the following based on whether they contain single or double bonds:

Therefore, it can be said that some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.

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The molar mass of Oz is 48 g/mol is true.

Molar mass of a substance is the mass of 1 mole of that substance or it is the number of grams per mole of a substance. The units for molar mass is grams/mole.

Therefore,The molar mass of Oz is 48 g/mol is correct because ozone have three oxygen and the molar mass of one oxygen is 16g/mol.

Ozone= 16×3

Ozone=48g/mol.

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Answer:

994.56

Explanation:

41.44 multiplied by 4, that gives us a month.

Then multiply by 6.