What is the percent by mass of hydrogen in aspirin C9 H8 O4?

The pH of the given aqueous solution with [H+] = 0.0055 M at 298 K is approximately 2.26.

The formula used to find the pH of the solution is given as,

pH = -log[H+]

Substituting [H+] = 0.0055 M into the above formula, we get,

pH = -log(0.0055) ≈ 2.26

Therefore, the pH of the given aqueous solution with [H+] = 0.0055 M at 298 K is around 2.26.

A solution's acidity or basicity is determined by its pH. It is described as the hydrogen ion concentration's negative logarithm, pH = -log(H+). It is commonly expressed as [H+] and measured in units of moles per litre (M).

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Answer:Molecular Formula SO2

Hybridization Type sp2

Bond Angle 119o

Geometry V-Shaped or Bent

Explanation:

hope this helped <3

The amount of heat produced if 8.65 moles of ethane undergo complete combustion is 12433 kJ.

From the question,

We are to determine the amount of heat produced if 8.65 moles of ethane undergo complete combustion.

From the given information

We have that

The heat of combustion for ethane is 47.8 kJ/g

First, we will determine the mass of 8.65 moles of ethane

Using the formula

Mass = Number of moles × Molar mass

Molar mass of ethane = 30.07 g/mol

∴ Mass of the ethane = 8.65 × 30.07

Mass of the ethane = 260.1055 g

From the question,

We have that, the heat of combustion for ethane is 47.8 kJ/g.

This means 1 g of ethane produces 47.8 kJ of heat.

Now

If  1 g of ethane produces 47.8 kJ of heat

Then,

260.1055 g of ethane would produce 260.1055 × 47.8 kJ of heat

260.1055 × 47.8 kJ = 12433.0429 kJ ≅ 12433 kJ

Hence, the amount of heat produced if 8.65 moles of ethane undergo complete combustion is 12433 kJ.

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The electron configuration of magnesium is shown by stating that there are 12 electrons in the first shell, 8 electrons in the second level, and 2 more electrons in the third level.

The atom contains electrons, which are negatively charged particles. The electrons in the atom revolve around the nucleus, which also contains protons and neutrons.

When there are electrons in an atom's orbital, it is said to have an electron arrangement. Electrons can also be found in the atom's various cells.

Since magnesium will occupy the first shell, there will be 12 electrons in Mg. It is still necessary to insert 12-2=10 electrons. The final two electrons and eight remaining electrons will both be in the n=2 level.

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Answer:

true

Explanation:

Answer:

True

Explanation:

In a displacement reaction, more reactive element displaces less reactive element. Whereas in a double displacement reaction there is exchange of ions of two compounds.

There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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Answer:

Some flowers are tall, others short, and finally some plants are an intermediate height. The tallest plants shade the shorter; the taller plants are

Explanation:

One liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is hydrochloric acid (HCl). Hydrochloric acid is a strong acid commonly used in laboratories for various purposes, including cleaning and dissolving mineral deposits.

When dry mortar, which is primarily composed of cement, hardens on floor tiles, it can be challenging to remove using traditional cleaning methods. However, hydrochloric acid can effectively dissolve and break down the cementitious components of the mortar.

It is important to note that when using hydrochloric acid, proper safety precautions should be followed, such as wearing protective gloves, goggles, and working in a well-ventilated area.

Additionally, it is crucial to dilute the hydrochloric acid to an appropriate concentration for the specific task, as using it undiluted can cause damage to the tiles or other surfaces.

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Diene: These compounds have a double bond that is conjugated. Dienophile: At least one pi bond exists in these compounds. And occasionally, these pi bonds joined together after some electron withdrawal.

The field of chemistry known as stereochemistry is concerned with "the study of the various spatial configurations of atoms in molecules." The methodical presentation of a particular area of science and technology, known as stereochemistry, typically necessitates a little detour into the past.

a discipline of chemistry that examines the spatial configuration of atoms and groups in molecules, as well as how that configuration relates to the attributes of a substance.

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pH is defined as the negative logarithm (base 10) of the hydrogen ion concentration ([H+]) in a solution. Therefore, option (C) is correct.

In other words, the pH scale measures the acidity or basicity of a solution. The lower the pH value, the more acidic the solution is, and the higher the pH value, the more basic or alkaline the solution is.

For example, pure water has a pH of 7, which is considered neutral, meaning it is neither acidic nor basic. Acids have pH values lower than 7, while bases have pH values greater than 7. The pH scale is important in many areas of chemistry, including biochemistry, environmental science, and medicine.

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The chloride ion (Cl-) has a single negative charge and a full octet of electrons in its outermost shell. It has a tetrahedral shape, with three equatorial lone pairs and one axial bond to a hydrogen or other positively charged ion.

The conjugate acid of chloride ion is HCl (hydrogen chloride), which is formed when the chloride ion accepts a proton (H+) from an acid. The resulting molecule has a positive charge and a linear shape, with a single bond between the hydrogen and chlorine atoms.

The conjugate acid of chloride ion, HCl, is a strong acid that readily donates a proton (H+) to a base to form the chloride ion. In water, HCl dissociates completely to form H+ and Cl- ions. The hydrogen ion (H+) has a positive charge and no electrons, while the chloride ion (Cl-) retains its original tetrahedral shape and three lone pairs of electrons.

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Answer:

Condensation

Explanation:

Zoe is quite keen to have noticed what we call condensation. Air contains many components, one of those being water vapor. Like how sugar is soluble in water, water can be said to be "soluble" in air. Water will evaporate into the air to a certain extent. The higher the temperature of the air, the more water the air can hold. If the air has more water that it can hold (potentially because of a temperature decrease), the extra water will come out of the air. Zoe's water bottle was cold, and because the air around Zoe's bottle had cooled down, the air can not hold as much water as it could when it was warm, so the air deposited the extra water in the form of liquid water onto the bottle, giving the illusion that her bottle was sweating.

The Kinetic Molecular Theory is a  scientific model that states atoms in a compound are found in a constant state of motion (movement).

The Kinetic Molecular Theory is a  scientific model that states atoms in a compound are found in a constant state of motion (movement).

Thermal energy refers to the movement of particles and therefore both concepts are interrelated.

In conclusion, the Kinetic Molecular Theory is a  scientific model that states atoms in a compound are found in a constant state of motion (movement).

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Answer:

1st figure. 3410

2nd figure. three thousand four hundred ten

3rd figure. 3000 + 400 + 10

Explanation:

these are three different figures hope this helps! sorry of I'm wrong and didnt understand the question !!

0.28 moles of nitrogen gas are there in 6.8 liters at room temperature and pressure (293 K and 100 kPa).

Ideal gas law :

An ideal gas is a gas in which atoms dose not exert any force on each other even after collision which walls and other atoms (inelastic collisions).

Mole definition:

The mole is the amount of compound present in a given system which has molecular mass as that of the mass of carbon12 .carbon 12

Using ideal gas law ,

PV=nRT

Given,

pressure = P = 100kPa

Volume = V = 6.8 Lit

Temperature = room temperature = T = 293 K

R= universal gas constant = 8.314

n= moles = ?

∴\(n = \frac{PV}{RT}\)

∴ n = 100 × 6.8 / 8.314 × 293

∴n = 0.28 moles

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Mass of H3PO4 reacted is 34.3 g. So, 34.3 grams of phosphoric acid reacted.

3 NaHCO3(aq) + H3PO4(s) → Na3PO4(aq) + 3 H2O(l) + 3 CO2(g)

Now we can see that every 3 moles of NaHCO3 reacts with 1 mole of H3PO4 to give 3 moles of CO2.

The given amount of CO2 produced is 26.1 L at 273 K and 1.00 atm of pressure.

To find out the moles of CO2 produced, we can use the Ideal Gas Law,

PV = nRT

where P = 1 atm, V = 26.1 L, T = 273 K, and R = 0.0821 L atm mol^-1 K^-1.

Plugging in these values, we get

n = PV/RT= (1.00 atm) (26.1 L) / (0.0821 L atm mol^-1 K^-1) (273 K)= 1.05 moles CO2

Since every 3 moles of NaHCO3 reacts with 1 mole of H3PO4 to give 3 moles of CO2, 1.05 moles of CO2 will react with 1.05/3 = 0.35 moles of H3PO4.

Now we can use the molar mass of H3PO4 to find the mass of H3PO4 in grams that reacted.

The molar mass of H3PO4 is 98.0 g mol^-1.

Therefore, mass of H3PO4 = moles of H3PO4 × molar mass of H3PO4

= 0.35 mol × 98.0 g mol^-1

= 34.3 g

Therefore, 34.3 g of H3PO4 reacted.

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Answer:

66 grams of ice would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C.

Explanation:

To calculate the amount of ice that would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C, we need to use the formula:

Q = m_water * c_water * ΔT_water + m_ice * Lf

where,
Q = the amount of heat transferred,
m_water = the mass of water, c_water is the specific heat capacity of water,
ΔT_water = the change in temperature of water, m_ice = the mass of ice,
Lf = the specific latent heat of fusion of ice.

First, let's calculate the amount of heat transferred to the water:

Q = m_water * c_water * ΔT_water
Q = 352 g * 1.0 cal/(g*°C) * (15-0) °C
Q = 5,280 cal

Next, we can use the specific latent heat of fusion of ice, which is 80 cal/g, to calculate the amount of heat required to melt the ice:

Q = m_ice * Lf
Q = m_ice * 80 cal/g
m_ice = Q / Lf
m_ice = 5,280 cal / 80 cal/g
m_ice = 66 g

Answer:

1. 1166.2

2. 2076

3. 1336. 8

4. 733.04

5. 1834.5

6. 556.6

7. - 410.6

8. 836.4

Explanation:

1.9 x 103 =928

Answer:

According to the law of conservation of mass, the mass of reactants will be equal to the mass of the products.

Explanation:

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:

A liquid of unknown composition: Unknown liquid

A liquid of known composition: Known liquid

A solid-liquid mixture of unknown composition: Unknown solid-liquid mixture

A solid of known composition: Known solid

The reaction between calcium nitrate (Ca(NO₃)₂) and sodium oxalate (Na₂C₂O₄) can be represented by the following chemical equation:

Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃

This is a double displacement reaction, where the calcium ion (Ca²⁺) from calcium nitrate and the oxalate ion (C₂O₄²⁻) from sodium oxalate switch places to form calcium oxalate (CaC₂O₄) and sodium nitrate (NaNO₃). The balanced chemical equation shows that one mole of calcium nitrate reacts with one mole of sodium oxalate to form one mole of calcium oxalate and two moles of sodium nitrate.

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Answer:The reactions are as follows: a carbon-12 (12C) nucleus captures a hydrogen nucleus (1H, a proton) to form a nucleus of nitrogen-13 (13N); a gamma ray (γ) is emitted in the process. The nitrogen-13 nucleus emits a positive electron (positron, e+) and becomes carbon-13 (13C).

Approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources listed in the chart that are known to produce greenhouse gas emissions. In this case, those would be oil, natural gas, and coal.

From the chart, we see that the percentages for these three energy sources are:

Oil: 37.9%

Natural gas: 23%

Coal: Not specified

Although the percentage for coal is not mentioned in the given information, it is a known fact that coal combustion releases greenhouse gases, including carbon dioxide (CO2). Therefore, we can assume that coal is among the fuels emitting greenhouse gases.

Adding up the percentages for oil and natural gas, we have:

37.9% (oil) + 23% (natural gas) = 60.9%

Therefore, approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

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Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).

It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.

A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.

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Answer:

Charged ion

Explanation: