What is the resource population of the weebugs?​

Our cells obtain the molecules they need to function properly from various sources

One important source is our diet. When we eat food, our digestive system breaks it down into smaller molecules that can be absorbed into the bloodstream. These molecules, such as glucose, amino acids, and fatty acids, are then transported to our cells, where they are used as fuel for energy production .

Additionally, our cells can synthesize some molecules on their own. Through processes like photosynthesis in plant cells or biochemical reactions in our body, cells can produce molecules like carbohydrates, lipids, proteins, and nucleic acids.

In summary, cells acquire the molecules they require from the food we eat, as well as through their own synthesis, ensuring they have the necessary resources for proper functioning.

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Answer:

A functioning human body has molecules from food (glucose and amino acids) and molecules from air (oxygen) in its cells.

A weak acid (or base) and its corresponding conjugate base (or acid) make up a buffer solution. If only a modest amount of base or acid is supplied, it can withstand pH fluctuations. pH of the solution is 3.48 .

Thus, The Henderson-Hasselbalch equation can be used to express the pH of a buffer solution.

The pH scale gauges a substance's acidity or basicity. The pH scale has numbers 0 through 14. Seven is the neutral pH. Acidic conditions have a pH under 7. More than 7 pH is considered basic.

Each whole pH number below 7 is ten times more acidic than the next higher value since the pH scale is logarithmic. For instance, pH 4 is 100 times (10 times 10) more acidic than pH 6, while pH 5 is ten times (10 times) more acidic than pH 4.

Thus, A weak acid (or base) and its corresponding conjugate base (or acid) make up a buffer solution. If only a modest amount of base or acid is supplied, it can withstand pH fluctuations. pH of the solution is 3.48 .

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By analyzing the potential energy diagrams and calculating ΔH using bond energies, we can determine whether a reaction is exothermic (ΔH < 0) or endothermic (ΔH > 0).

To create potential energy diagrams for chemical reactions and determine the value of ΔH (the change in enthalpy) for each reaction, we need to understand the basic concepts and steps involved.

Potential Energy Diagram: A potential energy diagram is a graphical representation of the energy changes that occur during a chemical reaction. The vertical axis represents the potential energy, while the horizontal axis represents the progress of the reaction.

Reactants and Products: Identify the reactants and products involved in each reaction. Assign them appropriate labels on the potential energy diagram.

Activation Energy: Determine the activation energy (Ea) for each reaction. It represents the energy barrier that must be overcome for the reaction to occur. On the diagram, the reactants' energy level is typically higher than the products' energy level, with the activation energy peak in between.

Transition State: Locate the highest point on the potential energy diagram, which represents the transition state or activated complex. This point indicates the highest energy level during the reaction.

ΔH Determination: ΔH represents the difference in enthalpy between the reactants and products. It can be determined by examining the vertical distance between the reactants' energy level and the products' energy level on the potential energy diagram.

ΔH Calculation: ΔH can be calculated using the formula ΔH = Σ (bond energies of reactants) - Σ (bond energies of products). The bond energies are the energy required to break a particular bond or released when a bond is formed.

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Rounding to the appropriate number of significant figures, the equilibrium constant (Kc) for the reaction is approximately 1.66.

To calculate the equilibrium constant (Kc) for the given reaction, we can use the formula:

Kc = ([H2]^3 * [N2]) / [NH3]^2

Plugging in the given equilibrium concentrations, we have:

Kc = (0.470^3 * 0.800) / (0.250^2)

Calculating the numerator:

(0.470^3 * 0.800) = 0.1037032

Calculating the denominator:

(0.250^2) = 0.0625

Now, dividing the numerator by the denominator:

Kc = 0.1037032 / 0.0625 = 1.6592512

The equilibrium constant represents the ratio of the concentrations of products to reactants at equilibrium. In this case, the equilibrium constant is greater than 1, indicating that the products (H2 and N2) are favored at equilibrium. This means that the forward reaction is favored, leading to the formation of more products compared to reactants.The equilibrium constant value of 1.66 suggests that the forward reaction is moderately favored at equilibrium, but without additional context, it is difficult to determine the extent of the reaction or the relative concentrations of reactants and products at the beginning of the reaction.

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The discovery of a 2-million-year-old fossil would align with the existing understanding of Earth's geological history, as it falls within the timeframe of the Quaternary period.

If scientists found a fossil in the middle layer that was determined to be 2 million years old, they would not automatically conclude that Earth was younger or older than 2 million years. The age of the fossil would provide valuable information about the minimum age of the layer in which it was found, but it would not necessarily provide conclusive evidence about the age of the entire Earth.

To determine the age of Earth, scientists rely on a variety of dating methods, including radiometric dating of rocks and minerals, as well as the study of isotopes and geological processes. These methods provide estimates of Earth's age in the billions of years.However, it would not significantly alter the prevailing scientific consensus that Earth is approximately 4.5 billion years old. The age of Earth is based on a comprehensive body of evidence from multiple disciplines and dating techniques, and a single fossil would not overturn that understanding.

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The Correct electron configuration of carbon as 1s² 2s² 2p². Option B.

To understand why this is the correct electron configuration, let's break it down step by step:

The atomic number of carbon is 6, which means it has six electrons. Electrons are distributed in energy levels or shells around the nucleus.

The first shell, known as the 1s orbital, can hold a maximum of 2 electrons. Therefore, the first part of the electron configuration is 1s², indicating that two electrons occupy the 1s orbital.

The second shell has two subshells: the 2s orbital and the 2p orbital. The 2s orbital can hold a maximum of 2 electrons, while the 2p orbital can hold a maximum of 6 electrons. In the case of carbon, after the 1s orbital, two more electrons occupy the 2s orbital. So far, we have 1s² 2s².

The remaining two electrons in carbon are placed in the 2p orbital. The 2p orbital consists of three separate p orbitals: 2px, 2py, and 2pz. Each p orbital can hold a maximum of 2 electrons. Therefore, the last part of the electron configuration for carbon is 2p², indicating that two electrons occupy the 2px and 2py orbitals. Option B is correct.

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The volume of hydrogen gas collected over water is approximately 25.10 liters. We need to consider the stoichiometry of the reaction, the ideal gas law, and the partial pressure of hydrogen gas.

First, let's balance the equation for the reaction between magnesium (Mg) and hydrochloric acid (HCl):

Mg + 2HCl -> MgCl₂ + H₂

From the balanced equation, we can see that 1 mole of magnesium reacts to produce 1 mole of hydrogen gas.

1. Calculate the number of moles of magnesium (Mg):

Molar mass of Mg = 24.31 g/mol

Number of moles of Mg = Mass of Mg / Molar mass of Mg = 25.6 g / 24.31 g/mol = 1.054 mol

2. Calculate the number of moles of hydrogen gas (H₂):

Number of moles of H₂ = Number of moles of Mg = 1.054 mol

3. Apply the ideal gas law to calculate the volume of hydrogen gas (V₂):

PV = nRT

Given:

Pressure (P) = 785.4 torr

Temperature (T) = 36.5 °C = 36.5 + 273.15 K = 309.65 K

R = 0.0821 L·atm/(mol·K) (gas constant)

Number of moles (n) = 1.054 mol

Convert the pressure to atm:

785.4 torr = 785.4 torr * (1 atm / 760 torr) = 1.032 atm

Substituting the values into the ideal gas law equation:

V₂ = (nRT) / P = (1.054 mol * 0.0821 L·atm/(mol·K) * 309.65 K) / 1.032 atm ≈ 25.10 L

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The mass (in grams) of chlorine gas is needed to react with 251 grams of iron is 479 grams. Option C.

To determine the mass of chlorine gas needed to react with 251 grams of iron, we need to use the stoichiometry of the balanced chemical equation:

2Fe + 3Cl2 → 2FeCl3

From the balanced equation, we can see that 2 moles of iron (Fe) react with 3 moles of chlorine gas (Cl2) to produce 2 moles of iron(III) chloride (FeCl3).

To calculate the mass of chlorine gas, we can follow these steps:

Step 1: Convert the given mass of iron (Fe) to moles.

Using the molar mass of iron (Fe), which is approximately 55.85 g/mol, we can calculate the number of moles of iron:

moles of Fe = mass of Fe / molar mass of Fe

moles of Fe = 251 g / 55.85 g/mol

moles of Fe ≈ 4.5 mol (rounded to one decimal place)

Step 2: Use the mole ratio from the balanced equation to find the moles of chlorine gas (Cl2) needed.

From the balanced equation, we know that 2 moles of Fe react with 3 moles of Cl2. Therefore, the moles of Cl2 can be calculated as:

moles of Cl2 = (moles of Fe / 2) * 3

moles of Cl2 = (4.5 mol / 2) * 3

moles of Cl2 ≈ 6.75 mol (rounded to two decimal places)

Step 3: Convert the moles of chlorine gas to grams.

Using the molar mass of chlorine gas (Cl2), which is approximately 70.90 g/mol, we can calculate the mass of chlorine gas:

mass of Cl2 = moles of Cl2 * molar mass of Cl2

mass of Cl2 = 6.75 mol * 70.90 g/mol

mass of Cl2 ≈ 479 grams (rounded to the nearest whole number) Option C is correct.

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If all the pumped water had remained in the cave system, approximately 71.43% of the cave would have been filled with water.

To calculate the percentage of the Thanksgiving Luang cave system that would have been filled with water if all the pumped water had remained, we need to find the ratio of the volume of water to the total volume of the cave system.Given that the cave system is estimated to be 35 million cubic meters large and 250 million liters of water were pumped out, we need to convert liters to cubic meters. Since 1 liter is equal to 0.001 cubic meters, the pumped water volume in cubic meters is 250 million multiplied by 0.001, which is 250,000 cubic meters.To find the percentage, we divide the volume of water (250,000 cubic meters) by the total volume of the cave system (35 million cubic meters) and multiply by 100.

Percentage = (Volume of water / Total volume of cave system) x 100

          = (250,000 / 35,000,000) x 100

          ≈ 0.7143 x 100

          ≈ 71.43%

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The electrons move from left to right through the circle labeled "M" to reach the cathode, where reduction takes place.

If oxidation occurs on the left side of the fuel cell and reduction occurs on the right side, the movement of electrons can be described as follows: Electrons move from left to right through the circle labeled "M."

In a fuel cell, the process of oxidation takes place at the anode (labeled A) where the fuel is oxidized, releasing electrons. These electrons then flow through the external electrical circuit, represented by the wire connecting objects A and B. The electrons reach the cathode (also labeled A) on the right side of the cell, where reduction occurs.The circle labeled "M" represents the membrane or electrolyte in the fuel cell. This membrane allows the transport of ions but blocks the movement of electrons. As a result, electrons cannot flow directly through the electrolyte but must travel through the external circuit.

This movement of electrons through the external circuit is what generates an electric current that can be used to power electrical devices or systems.

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A solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

We must first convert the amount of nitrate(V) ions in drinking water to moles per litre since the threshold concentration over which "Blue-Baby" Syndrome might manifest is 0.05 mg/cm3.

It is necessary to know the molar mass of nitrate(V) ions in order to convert from mg/cm3 to moles per litre (NO3-).

The formula below can be used to determine NO3-'s molar mass:

N: 14.01 g/mol for the atomic mass

O: 16.00 g/mol is the atomic mass (3 oxygen atoms in NO3-)

NO3-'s total molar mass is equal to 14.01 + 16.00 x 3 = 62.01 g/mol.

Let's now translate the specified concentration from mg/cm3 to moles/liter (M).

As 1 g = 1000 mg, 1 mg/cm3 is 0.001 g/cm3.

1 cm3 = 0.001 g/mL multiplied by 0.001 g/cm3

1 L/1000 mL x 0.001 g/mL = 0.001 g/L

We must change the grams into moles using the molar mass in order to get the molarity:

1.61 × 10-5 mol/L = 0.001 g/L / 62.01 g/mol

As a result, a solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

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The volume (in liters) of hydrogen gas, H₂ that can be produced when 3.2 grams of aluminum (Al) reacts with sulfuric acid, is 4.0 liters

First, we shall determine the mole in 3.2 grams of aluminum (Al). Details below:

Mole = mass / molar mass

Mole of Al = 3.2 / 26.98

Mole of Al = 0.119 mole

Next, we shall determine the mole of of Hydrogen gas, H₂ produced from the reaction. Details below:

2Al + 3H₂SO₄ -> Al₂(SO₄)₂ + 3H₂

From the balanced equation above,

2 moles of Al reacted to produced 3 moles of H₂

Therefore,

0.119 mole of Al will react to produce = (0.119 × 3) / 2 = 0.1785 mole of H₂

Finally, we shall obtain the volume of hydrogen gas, H₂ produced Details below

At STP,

1 mole of H₂ = 22.4 Liters

Therefore,

0.1785 moles of H₂ = 0.1785 × 22.4

0.1785 moles of H₂ = 4.0 liters

Thus, we can conclude that the volume of hydrogen gas, H₂ produced is 4.0 liters

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Deprotonation refers to the removal of a proton from a molecule, while an enolate is an anionic species formed by deprotonation of the α-carbon adjacent to a carbonyl group. An enone, on the other hand, is a molecule containing a carbon-carbon double bond and a carbonyl group.

"Deprotonate," "enolate," and "enone" are terms used in organic chemistry to describe specific reactions and functional groups. Let's break down each term:

Deprotonate: Deprotonation refers to the removal of a proton (H+) from a molecule. It is a process that involves the transfer of a proton from a molecule to a base. The resulting species is negatively charged and called an anion.

Deprotonation reactions are common in various organic reactions and play a crucial role in the formation of new bonds and the generation of reactive intermediates.

Enolate: An enolate is an anionic species that contains a carbon-carbon double bond and a negatively charged oxygen or nitrogen atom. Enolates are formed through deprotonation of the α-carbon adjacent to a carbonyl group (such as a ketone or aldehyde).

The formation of enolates is an important step in many organic reactions, such as aldol condensation and Michael addition, as enolates serve as nucleophiles or reactive intermediates.

Enone: An enone is a molecule that contains a carbon-carbon double bond (C=C) and a carbonyl group (C=O) adjacent to each other. Enones are carbonyl compounds that possess a conjugated double bond system. They exhibit unique reactivity due to the presence of both a double bond and a carbonyl group, making them valuable intermediates in organic synthesis.

Enones are involved in various reactions, including Michael additions, Diels-Alder reactions, and cycloadditions, to form complex organic compounds.

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To complete Sally's paragraph of the carbon cycle, the correct words to fill in the blanks are:

Close to the volcano, the carbon dioxide levels could increase. This could be good for plants, because they require carbon dioxide to grow. Over thousands of years when these organisms decay, they could form more limestone. This part of the carbon cycle is an example of how carbon from the atmosphere is used by organisms that eventually become part of the lithosphere.

The carbon cycle is a biogeochemical cycle that describes the movement of carbon through the biosphere, geosphere, hydrosphere, and atmosphere. The carbon cycle is one of the most important cycles on Earth, as it is essential for life.

In the paragraph, Sally is describing how the carbon cycle can be affected by volcanoes. When a volcano erupts, it releases carbon dioxide into the atmosphere. This can increase the carbon dioxide levels in the atmosphere, which can be good for plants. Plants use carbon dioxide to photosynthesize, which is the process by which they convert sunlight into energy.

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A PEMFC running at 25°C generally displays a nonlinear connection in its I-V curve. The voltage output is quite high for low currents and progressively drops as the current rises.

Thus, the highest voltage possible under perfect circumstances is known as theoretical voltage. Activation loss appears as a voltage drop. It is caused by kinetic resistance at the electrodes.

Ohmic Loss is internal resistance in the electrolyte and electrode materials, which results in a voltage loss. Reactant depletion at the electrodes as a result of mass transport restrictions results in concentration loss, which lowers voltage.

By adopting more sophisticated catalyst materials or by optimizing their composition, catalyst efficiency may be increased to decrease losses in PEMFCs.

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The best explanation for the increase in the number of plants with long, narrow flowers over time is option D: Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.

In this population, short, wide flowers are better suited for bee pollination, while long, narrow flowers are more suitable for hummingbird pollination. Over time, the plants with long, narrow flowers produce more seeds compared to those with short, wide flowers.

This happens because the hummingbirds, which are the main pollinators for long, narrow flowers, are more effective in transferring pollen between these flowers. As a result, the long, narrow flower individuals have a higher reproductive success and pass on their traits to the next generation

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The pH of the solution is 6.04. The correct option is B

The pH of a solution is a measure of its acidity or alkalinity. A pH of 7.0 is neutral, a pH below 7.0 is acidic, and a pH above 7.0 is alkaline.

A solution of HONH2 and HONH3CI reacts with the addition of NaOH to produce HONH2 and NaCl. The solution becomes more alkaline as a result of this reaction because it contains more HONH2.

The pH of the solution can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([HONH2]/[HONH3Cl])

The pKa of HONH₂ is 5.97. The concentrations of HONH₂ and HONH3CI in the solution are 0.100 M and 0.080 M, respectively.

Substituting these values into the Henderson-Hasselbalch equation, we get:

pH = 5.97 + log(0.100/0.080) = 6.04

Therefore, the pH of the solution is 6.04.

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Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = [tex]\mathrm{\frac{mass}{molar \ mass}}[/tex]

                 = [tex]\frac{15.2}{40.1 + 12 + (16 \times 3)}[/tex]

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = [tex]\mathrm{\frac{Volume \ in \ L}{22.4}}[/tex]

⇒ [tex]0.1518 = \mathrm{\frac{Volume}{22.4}}[/tex]

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

you can use this method to balance any equation,

write you elements down , then start balancing them one after the other,

starting from metals , to non metals

it's better to balance hydrogen and oxygen the last and in most cases , they are automatically balanced

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The equilibrium expression can be written as follows:

K = [CaCO₃] × [H₂]⁴

------------------

[CaO] × [CH₄] × [H₂O]²

In this equilibrium expression, the square brackets represent the concentrations of the species involved in the reaction, and the coefficients of the balanced equation indicate the stoichiometric coefficients of the corresponding species.

The concentration of a pure solid (CaCO₃ in this case) is not included in the equilibrium expression, as it remains constant throughout the reaction.

The equilibrium constant (K) represents the ratio of the product concentrations to the reactant concentrations at equilibrium, each raised to the power of their respective stoichiometric coefficients. The specific values of these concentrations depend on the initial conditions, and K remains constant as long as the temperature is unchanged.

It is important to note that the equilibrium constant expression is written based on the balanced chemical equation. The stoichiometric coefficients determine the relationship between the concentrations of reactants and products, allowing us to express the equilibrium state quantitatively using the equilibrium expression.

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1. The mass of sodium sulfate, Na₂SO₄ formed from the reaction is 131.13 g

2. The percentage yield obtained from the reaction is 93.3%

We shall begin by obtaining the limiting reactant. This obtained as follow

2NaOH + H₂SO₄ —> Na₂SO₄ + 2H₂O

From the balanced equation above,

80 g of NaOH reacted with 98 g of H₂SO₄

Therefore,

98.6 g of NaOH will react with = (98.6 × 98) / 80 = 120.785 g of H₂SO₄

Since a higher amount (i.e 120.785 g) of H₂SO₄ than what was given (i.e 80.5 g) is needed to react with 98.6 g of NaOH, thus, the limiting reactant is H₂SO₄

Finally, we shall determine mass of sodium sulfate, Na₂SO₄ formed. Details below:

2NaOH + H₂SO₄ —> Na₂SO₄ + 2H₂O

From the balanced equation above,

98 g of H₂SO₄ reacted to produce 142 g of Na₂SO₄

Therefore,

90.5 g of H₂SO₄ will react to produce = (90.5 × 142) / 98 = 131.13 g of Na₂SO₄

Thus, the mass of mass of sodium sulfate, Na₂SO₄ formed is 131.13 g

The percentage yield obtained can be obtained as follow:

Percentage yield = (Actual /Theoretical) × 100

Percentage yield = (122.4 / 131.13) × 100

Percentage yield = 93.3%

Thus, the percentage yield is 93.3%

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Constellations can be excluded from a list of objects in the solar system.

The correct option is A.

The solar system refers to the collection of celestial bodies that are gravitationally bound to the Sun. It consists of the Sun, the eight planets namely; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, their moons, asteroids, comets, and other smaller objects.

While constellations are formations of stars as observed from Earth, they are not physical objects within the solar system itself.

The Sun, planets, and the asteroid belt, on the other hand, are all components of the solar system.

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The number of electrons  you would expect to find in one atom of this element is 10.

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

Since the atom is electrically neutral, the number of protons in the atom must be equal to the number of electrons in the atom.

For an atom represented as X10, with an atomic number of 10, the number of electrons in the atom is simply 10.

Thus, if  an element X appears on the periodic table as X10 22.076, the number of electrons  you would expect to find in one atom of this element is 10.

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The enthalpy of fusion of sodium acetate is approximately -93.64 J/g.

To calculate the enthalpy of fusion (ΔH) of sodium acetate, we can use the principle of energy conservation. The heat lost by the hand warmer during the crystallization process is equal to the heat gained by the water in the calorimeter.

First, let's calculate the heat gained by the water in the calorimeter using the formula q = m × c × ΔT, where q is the heat gained or lost, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

q_water = m_water × c_water × ΔT_water

Given:

m_water = 600 g

c_water = 4.18 J/g-°C

ΔT_water = 36.4°C - 25°C = 11.4°C

q_water = 600 g × 4.18 J/g-°C × 11.4°C

q_water = 28092 J

Since the heat lost by the hand warmer during crystallization is equal to the heat gained by the water, we can write:

q_water = q_handwarmer

Now, let's calculate the heat lost by the hand warmer using the same formula:

q_handwarmer = m_handwarmer × c_handwarmer × ΔT_handwarmer

Given:

m_handwarmer = 300 g

c_handwarmer = unknown (specific heat capacity of sodium acetate)

ΔT_handwarmer = 36.4°C - initial temperature of sodium acetate

Since the sodium acetate undergoes crystallization, its temperature remains constant during this phase change. The temperature at which crystallization occurs is known as the freezing point of sodium acetate, which is approximately 58°C. Therefore:

ΔT_handwarmer = 36.4°C - 58°C = -21.6°C

Now, we can substitute the known values into the equation:

q_water = q_handwarmer

28092 J = 300 g × c_handwarmer × -21.6°C

To solve for c_handwarmer, we rearrange the equation:

c_handwarmer = -28092 J / (300 g × -21.6°C)

c_handwarmer ≈ 5.47 J/g-°C

The specific heat capacity of sodium acetate (c_handwarmer) is approximately 5.47 J/g-°C.

The enthalpy of fusion (ΔH) can be calculated using the equation ΔH = q_handwarmer / m_handwarmer:

ΔH = -28092 J / 300 g

ΔH ≈ -93.64 J/g

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Answer:

1.2046*10^24 molecules

Answer:

1.506×1023 molecules

Explanation:

How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S8)? ∴ 64 g of sulphur will contain=6.022×1023×64256=1.506×1023 molecules.

Four Hydrogen atoms are present in the molecule (Furan) shown below.

Furan is a heterocyclic organic compound with a five-membered ring containing four carbon atoms and one oxygen atom. It has the chemical formula C4H4O. Furan is a colorless, volatile liquid with a distinctive aromatic odor. Coal tar and organic material burning make it.

Furan is utilised in resins, polymers, and solvents. Furan is poisonous and carcinogenic, hence its use and exposure must be carefully controlled.

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