In a hotel breakfast bar, you see an older woman sticking a fork into a toaster to remove a piece of toast. You warn her not to do that, and she says, "You know, I always wondered why forks conduct electricity so well." As an astute chemistry student, how would you explain it to her? Make sure you provide a relationship to electronegativity, proton pull, and electron distribution in your answer.

The statement that is true of a Lewis base is that a Lewis base donates electron pairs (option A).

A Lewis base is any nucleophylic compound that can donate a pair of electrons and form a coordinate covalent bond.

On the other hand, a Lewis acid is any electrophylic compound that can accept a pair of electrons and form a coordinate covalent bond.

This means that a Lewis base can donate a pair of electrons to a Lewis acid to form a product containing a coordinate covalent bond. This product is also referred to as a Lewis adduct.

Therefore, option A is correct about Lewis base

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Answer:

The energy required is 1.634×J, the wavelength is 1.215×m, and the kind of electromagnetic radiation is the ultraviolet radiation.

Explanation:

In the question above, the initial level = 1, and = 2. Then, we use Rydberg's equation to calculate the wavelength of the light absorbed by the atom during the transition.

The NADH generated during glycolysis and the citric acid cycle feeds its high-energy electrons to the electron transport chain (ETC) also known as the oxidative phosphorylation.

The ETC is a series of protein complexes and electron carriers that transfer electrons from NADH and FADH2 to oxygen, creating a flow of electrons through the chain. During glycolysis, the glucose molecule is broken down into two molecules of pyruvate, generating two molecules of NADH in the process. In the citric acid cycle, also known as the Krebs cycle, the pyruvate molecules are further metabolized, generating additional NADH and FADH2 molecules. The NADH and FADH2 molecules are high-energy electron carriers because they have a surplus of electrons. These high-energy electrons are then transferred to the electron transport chain.

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The balanced chemical equation for the reaction between solid zinc(II) sulfide and aqueous hydrobromic acid (HBr) to form aqueous zinc(II) bromide and dihydrogen sulfide gas is:

ZnS(s) + 2 HBr(aq) → ZnBr2(aq) + H2S(g)

In this equation, the phases of each substance are indicated in parentheses after the chemical formula.

The solid zinc(II) sulfide (ZnS) is indicated by the "(s)" phase, the aqueous hydrobromic acid (HBr) is indicated by the "(aq)" phase, the aqueous zinc(II) bromide (ZnBr2) is indicated by the "(aq)" phase, and the dihydrogen sulfide gas (H2S) is indicated by the "(g)" phase.

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This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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Earthquakes and volcanoes are often found along or near boundaries of continents and oceans.

The Ring of Fire is an area around the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur due to the movement and interaction of tectonic plates. The Ring of Fire is also known as the Circum-Pacific Belt.

1. Seismologist - Scientists who study earthquakes

2. Faults - Are breaks or cracks in the rocks that make up Earth's crust.

3. Most earthquakes and volcanoes occur in Bands

4. Earthquakes and volcanoes are often Along or near boundaries of continents and oceans.

5. A fault is a break or a crack in the rocks of Earth's crust where an earthquake might take place.

7. An earthquake might cause a landslide when the ground shakes.

8. Landforms that are usually found along the boundary between plates are Mountains and Ocean trenches.

9. An earthquake is usually caused by movement along a fault.

10. According to the map, most earthquakes occur around the edges of the ocean and continental plate boundaries.

11. The Ring of Fire is an area around the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur

There are many active volcanoes in the area of the Ring of Fire.

There are many seismic faults in the area of the Ring of Fire.

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58.44 g.

Explanation:

Skill 3-1 Calculate the molecular mass of a compound as the sum of the atomic masses of its elements. So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g. One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.

Empirical formula is C4H7.

Empirical formula- A formula that lists the relative amounts of the constituent components in a compound without specifying the number or configuration of atoms.

When a hydrocarbon (CxHy) burns, CO2 and H2O are produced.

(Note: It mentions that a hydrocarbon is burned, which suggests that oxygen isn't present.)

moles of C in the compound: 44 g x 1 mol C/mole and 27.8 g CO2 x 1 mol CO2. = 0.632 moles of carbon

9.96 g H2O x 1 mol H2O/18 g x 2 mol H/mol H2O Equals 1.11 moles of H in the molecule.

We can calculate the mass and verify that it adds up to 8.70 g to rule out the presence of oxygen in the original molecule.

mass C=0.632 mol C times 12 g/mol equals 7.58 g C

H mass equals 1.11 mol H = 1.11 g H x 1 g/mol

Total mass Equals 8.69 g.

We may divide both by the lowest value (0.632), which will give us the lowest whole number of moles.

0.632/0.632 = 1.0 moles C

H = 1.11/0.632 = 1.75 moles.

Now we can multiply them by 4 to get H's whole number, which is-

C = 4 moles.

H = 7 moles

∴Empirical equation: C4H7

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Answer:

A.) a subscript

Explanation:

Subscripts are numbers that appear below and after a symbol. The number of atoms in that element is indicated by subscripts. It is assumed that if an element doesn't have a subscript, the subscript is 1. Here 4 represents a subscript. The correct option is A.

Subscripts are displayed at the symbol's bottom left or right corner. The element's atomic number is indicated if it is on the left. It indicates the number of atoms of the element in the formula if it is on the right side.

It is possible to display a letter or a number below the standard line of type by using a subscript. For instance: The symbol for water in science is H₂O. H₂O should be used in writing. In this instance, 2 is seen below the usual line. Subscript is the term for this.

Thus the correct option is A.

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Answer:

a) Q₁ = 58.82 KJ

b) Q₂ = 42.48 KJ

c) Q₃ = 29.22 KJ

d) Q = 130.52 KJ  

Explanation:

a)

In order to find the energy absorbed to heat the solid, we will use:

\(Q_{1} = mC_{1}\Delta T_{1}\)

where,

Q₁ = Heat absorbed for heating solid = ?

m = mass of solid = 488.3 g = 0.4883 kg

C₁ = Specific Heat Capacity of Solid = 2.96 J/g °C

ΔT₁ =  Change in temperature of Solid = Melting Temperature - Initial Temp.

ΔT₁ = 17.6°C - (-23.1°C) = 40.7°C

Therefore,

\(Q_{1} = (488.3\ g)(2.96\ J/g\ ^{0}C)(40.7\ ^{0}C)\)

Q₁ = 58.82 KJ

b)

In order to find the absorbed to melt the solid at 17.6°C, we will use:

\(Q_{2} = nH_{fus}\)

where,

Q₂ = Heat absorbed for melting solid = ?

H_fus = Heat of Fusion = 8.04 KJ/mol

n = no. of moles = \(\frac{m}{MM} = \frac{488.3\ g}{92.41\ g/mol} = 5.28 mol\)

Therefore,

\(Q_{2} = (5.28\ mol)(8.04\ KJ/mol)\)

Q₂ = 42.48 KJ

c)

In order to find the energy absorbed to heat the liquid, we will use:

\(Q_{3} = m C_{3}\Delta T_{3}\)

where,

Q₃ = Heat absorbed for heating Liquid = ?

m = mass of solid = 488.3 g = 0.4883 kg

C₃ = Specific Heat Capacity of Liquid = 1.75 J/g °C

ΔT₃ =  Change in temperature of Liquid = Final Temp. - Melting Temp.

ΔT₃ = 51.8°C - 17.6°C = 34.2°C

Therefore,

\(Q_{3} = (488.3\ g)(1.75\ J/g\ ^{0}C)(34.2\ ^{0}C)\)

Q₃ = 29.22 KJ

d)

Total amount of energy absorbed during entire process is:

\(Q = Q_{1} + Q_{2} + Q_{3}\)

\(Q = 58.82\ KJ + 42.48\ KJ + 29.22\ KJ\)

Q = 130.52 KJ

In order to heat a 488.3 g solid, 58.8 kJ are required. To melt the solid, 42.5 kJ are required. To heat the liquid, 29.2 kJ are required. The total amount of energy absorbed is 130.5 kJ.

Initially, a 488.3 g solid at -23.1 °C is heated up to 17.6 °C (melting point). We can calculate the heat required (Q₁) using the following expression.

\(Q_1 = c \times m \times \Delta T = \frac{2.96J}{g.\° C } \times 488.3g \times (17.6\° C-(-23.1\° C)) \times \frac{1kJ}{1000J} = 58.8 kJ\)

where,

At 17.6 °C, we can calculate the heat (Q₂) required to melt the solid using the following expression.

\(Q_2 = \Delta H_{fus} \times \frac{m}{MM} = 8.04 kJ/mol \times \frac{488.3 g}{92.41g/mol} = 42.5kJ\)

where,

The liquid is heated from 17.6 °C to 51.8 °C. We can calculate the heat required (Q₃) using the following expression.

\(Q_3 = c \times m \times \Delta T = \frac{1.75J}{g.\° C } \times 488.3g \times (51.8\° C-17.6\° C)) \times \frac{1kJ}{1000J} = 29.2 kJ\)

The total amount of energy absorbed (Q) is the sum of the energy absorbed in each step.

\(Q = Q_1 + Q_2 + Q_3 = 58.8kJ+42.5kJ+29.2kJ= 130.5kJ\)

In order to heat a 488.3 g solid, 58.8 kJ are required. To melt the solid, 42.5 kJ are required. To heat the liquid, 29.2 kJ are required. The total amount of energy absorbed is 130.5 kJ.

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Answer:

10.801 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A (¹⁰B):

Mass of A = 10

Abundance (A%) = 19.9%

Isotope B (¹¹B):

Mass of B = 11

Abundance (B%) = 80.1%

Atomic mass of Boron =?

The atomic mass of boron can be obtained as illustrated below:

Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

= [(10 × 19.9)/100] + [(11 × 80.1)/100]

= 1.99 + 8.811

= 10.801 amu

Thus, the atomic mass of boron is 10.801 amu

The atomic mass of boron with natural abundance of 19.9% of 10 B and 80.1%  of 11 B is 10.801 amu

Boron has 2 isotopes.

First isotopes

mass = 10

% abundance = 19.9%

Second Isotopes

mass = 11

% abundance = 80.1%

Therefore,

Atomic mass = (19.9% of 10) + (80.1% of 11)

Atomic mass = (19.9 / 100 × 10) + (80.1 / 100 × 11)

Atomic mass = 199 / 100 + 881.1 / 100

Atomic mass = 1.99 + 8.811

Atomic mass = 10.801

Atomic mass = 10.801 amu

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When naphthalene is mixed with alcohol does it become a homogeneous mixture.

A homogeneous mixture is the type of mixture that is obtained between two substances when mixed such that a uniform distribution is observed.

While a heterogeneous mixture is the type of mixture that is obtained between two substances such that non uniform distribution is observed.

An example of a heterogeneous mixture is the mixture of sand and water or oil and water. This leads to the formation of two distinct layers.

Naphthalene can be dissolved in alcohol in such a way that a uniform mixture is obtained. Therefore when mixed a homogeneous mixture is obtained.

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The theoretical yield of H₂S is 13.5 g.

The percent yield is 75.5 %.

The equation of the reaction is given below:

Moles of FeS reacting = mass/molar mass

Molar mass of FeS = 88 g/mol

Moles of FeS reacting = 35/88 = 0.398 moles

Moles of H₂S produced = 0.398 moles

Molar mass of H₂S = 34 g/mol

Mass of H₂S produced = 0.398 * 34 = 13.5 g

Theoretical yield of H₂S is 13.5 g.

Actual yield of H₂S = 10.2 g

Percent yield = 10.2/13.5 * 100%

Percent yield = 75.5 %

In conclusion, the actual yield is less than the theoretical yield.

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The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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Answer:it conduct thermal conductivity because of the heat it holds

Explanation:

When energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.

We know from the principle of transfer of energy that energy can neither be created nor destroyed but is transformed from one form to another. The image is not shown here but I will try to explain what energy transfer is.

Usually, when energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.

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Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

To find the standard reduction potential at 25°C for the half-reaction Ag2CrO4(s) + 2e¯ → 2Ag(s) + CrO4²-(aq), we can use the Nernst equation, which relates the standard reduction potential (E°) to the equilibrium constant (K) and the reaction quotient (Q).

The Nernst equation is given as follows:

E = E° - (RT/nF) * ln(Q)

Given information:

Ksp = 1 × 10^(-12)

E = +0.799 V (standard reduction potential of Ag+ to Ag)

Since the reaction involves the dissolution of Ag2CrO4(s), the reaction quotient Q can be expressed as [Ag+]²/[CrO4²-].

Since the stoichiometry of the reaction is 2:1 for Ag2CrO4 to Ag+, we can say that [Ag+]² = Ksp.

Therefore, Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

Please note that without specific values for temperature (T) and the ideal gas constant (R), the exact standard reduction potential at 25°C cannot be determined.

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Answer:

maybe all the basic oxide i guess

Explanation:

cuo + hcl -> cucl2 + h20

...

The reaction of zinc oxide with hydrochloric acid is as follows:

The reaction of zinc chloride with hydrochloric acid represents an example of a neutralization reaction. This reaction significantly forms zinc chloride which is a salt and water.

According to the context of this question, the desired product of the given reaction forms the salt. In this reaction, zinc oxide acts as a base while hydrochloric acid is the strongest acid.

When acid reacts with bases, the product formed is called a salt, so zinc chloride is a salt. This is because it is one of the characteristic properties of acid.

Therefore, the desired product of the reaction of zinc oxide with hydrochloric acid is well described above.

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Explanation:

The process by which gas I directly converted to solid is called deposition (reverse sublimation)

Answer:

Deposition

Explanation:

Is the phase transition in which gas transforms into solid without passing through the liquid phase.

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer:

The correctly written thermochemical equation is:

C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l), ΔH = -2,220 kJ/mol

This equation represents the combustion of propane (C3H8) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), with a heat release of -2,220 kJ/mol. The state symbols (g) for gases and (l) for liquids indicate the physical state of each substance at standard conditions.

Explanation:

ABOVE

Answer:

Covalent bonds share their valence electrons.

Explanation:

Answer:

Gases, liquids and solids are all made up of microscopic particles, but the behaviors of these particles differ in the three phases. Gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Explanation:

Answer:

tectonic plates

Explanation:

Answer:

C8H18(g) + 12.5O2(g) -> __8__CO2(g) + 9H2O(g) + heat

CH4(g) + _2___O2(g) -> ____CO2(g) + _2___H2O(g) + heat

C3H8(g) + _5___O2(g) -> _3___CO2(g) + __4__H2O(g) + heat

2C6H6(g) + __15__O2(g) ->  __12__CO2(g) + __6__H2O(g) + heat

Explanation:

I hope it helps!

Fossil fuels are natural energy resources formed from the remains of ancient plants and organisms, such as coal, oil, and natural gas, which are burned to release energy.

Balanced reactions are as follows:

C₈H₁₈ (g) + 12.5O₂ (g) → 8CO₂ (g) + 9H₂O(g) + heat

CH₄ (g) + 2O₂ (g) → 1CO₂ (g) + 2H₂O (g) + heat

C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g) + heat

C₆H₆ (g) + 7.5O₂ (g) → 6CO₂ (g) + 3H₂O (g) + heat

A combustion reaction, also known as a combustion process, is a chemical reaction in which a substance combines with oxygen to produce heat and light. It involves the rapid oxidation of a fuel in the presence of an oxidizer, typically atmospheric oxygen. The reaction releases energy in the form of heat and light.

The general equation for a combustion reaction can be represented as: fuel + oxygen → carbon dioxide + water + energy.

Combustion reactions are essential for various processes, including the burning of fossil fuels for energy production, combustion engines in vehicles, and even the process of respiration in living organisms.

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The United States experienced a decrease in the real GDP, high inflation, and arising unemployment rate.

The United States appeared to be entering a recession.A recession is a decline in economic activity, characterized by declining GDP, high unemployment rates, and increased unemployment benefits. Economic analysts and the media commonly use a two-quarter consecutive decline in real GDP as a definition of a recession.

The United States is considered to have entered a recession in the 1970s, which was characterized by an energy crisis, inflation, and recession. However, by the end of the decade, the economy had improved, and it entered into the 1980s with a strong economic performance.

The 1970s were a period of high inflation, low growth, and an oil crisis, which had a significant impact on the United States economy. Therefore, it can be concluded that The United States was in the middle of an economic boom before the 1970s recession and entered a recession in the 1970s due to a decrease in the real GDP, high inflation, and arising unemployment rate.

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The question is asking how much NaCl will be produced from Cl and Na.

We are given the mass of Na = 8.30g, which is the limiting reagent because we are told that Cl2 is in excess.

Let us first balance the equation:

2Na + Cl2 = 2NaCl

The first thing to do is to calculate the number of moles of Na.

n=m/M where m is the mass of Na and M is the molar mass

n=8.30g/22.99g/mol

n= 0.36 mol

Now we can use the stoichiometry to calculate the number of moles for NaCl.

So for every 2 moles of Na that reacts, 2 moles of NaCl are produced according to the balanced equation.

Therefore the number of moles of Na = number of moles of NaCl

n=0.36 mol

We can now find the mass of NaCl produced.

m=n x M

m=0.36 mol x 58.44 g/mol

m = 21.09 g

Answer:

Question 1

A. Empirical formula is C8H8O3

B. Molecular formula is C8H8O3

Question 2.

A. Empirical formula is CH2

B. Molecular formula is C4H8

Explanation:

Question 1:

A. Determination of the empirical formula:

Carbon (C) = 63.2%

Hydrogen (H) = 5.26%

Oxygen (O) = 31.6%

Divide by their molar mass

C = 63.2/12 = 5.27

H = 5.26/1 = 5.26

O = 31.6/16 = 1.975

Divide by the smallest

C = 5.27/1.975 = 2.7

H = 5.26/1.975 = 2.7

O = 1.975/1.975 = 1

Multiply through by 3 to express in whole number

C = 2.7 x 3 = 8

H = 2.7 x 3 = 8

O = 1 x 3 = 3

Therefore, the empirical formula for the compound is C8H8O3

B. Determination of the molecular formula of the compound.

From Avogadro's hypothesis, 1 mole of any substance contains 6.02×10²³ molecules.

Now from the question given, we were told that 1 molecule of the compound has a mass of 2.53×10¯²² g.

Therefore, 6.02×10²³ molecules will have a mass of = 6.02×10²³ x 2.53×10¯²² = 152.306 g

Therefore, 1 mole of the compound = 152.306 g

The molecular formula of the compound can be obtained as follow:

[C8H8O3]n = 152.306

[(12x8) + (1x8) + (16x3)]n = 152.306

[(96 + 8 + 48 ]n = 152.306

152n = 152.306

Divide both side by 152

n = 152.306/152

n = 1

The molecular formula => [C8H8O3]n

=> [C8H8O3]1

=> C8H8O3

Question 2:

A. Determination of the empirical formula of the compound.

Mass sample of compound = 0.648 g

Carbon (C) = 0.556 g

Mass of Hydrogen (H) = mass sample of compound – mass of carbon

Mass of Hydrogen (H) = 0.648 – 0.556

Mass of Hydrogen (H) = 0.092 g

Thus, the empirical formula can be obtained as follow:

C = 0.556 g

H = 0.092 g

Divide by their molar mass

C = 0.556/12 = 0.046

H = 0.092/1 = 0.092

Divide by the smallest

C = 0.046/0.046 = 1

H = 0.092/0.046 = 2

Therefore, the empirical formula of the compound is CH2.

B. Determination of the molecular formula of the compound.

Mole of compound = 0.5 mole

Mass of compound = 28.5 g

Molar mass of compound =.?

Mole = mass /Molar mass

0.5 = 28.5/ Molar mass

Cross multiply

0.5 x molar mass = 28.5

Divide both side by 0.5

Molar mass = 28.5/0.5 = 57 g/mol

Thus, the molecular formula of compound can be obtained as follow:

[CH2]n = 57

[12 + (1x2)]n = 57

14n = 57

Divide both side by 14

n = 57/14

n = 4

Molecular formula => [CH2]n

=> [CH2]4

=> C4H8.

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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The solubility of the salts is affected by the temperature changes. 1. NaCl is least affected by temperature. 2. supersaturated. 3. 60 grams KBr. 4. Ethanol has both polar and non-polar groups. 5. Mixing and shaking.

A KBr solution with 90 gm solute in 100 grams of water at 50 degrees is classified as supersaturated. 60 grams of KBr are needed to make a saturated solution in 100 gm of water at 30 degrees.

Ethanol is a general solvent due to the presence of both the polar and the non-Polar groups. As a result, it is easier to dissolve both polar molecules and non-Polar molecules. The dissolving rate can be increased by mixing or shaking the solution. Also, the sugar dissolves faster in hot than cold tea.

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