Can you please help me ?

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

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Answer:

Au^3+(aq) +3e ------> Au(s). 1.50 V

Explanation:

When we construct the galvanic cell, our intention is to produce energy by spontaneous electrochemical reactions. In order to have a spontaneous electrochemical reaction, E°cell must be positive. The more positive the value of E°cell, the more spontaneous the reaction is.

E°cell= E°cathode - E°anode

If E°cathode= 1.50 V

E°anode= -0.25 V

E°cell= 1.50 -(-0.25)

E°cell= 1.75 V

Hence the process; Au^3+(aq) +3e ------> Au(s) yields the highest standard cell potential

Answer:

D. no definite shape or. definite volume

Explanation:

Gases do not have a definite shape or volume because the molecules in gases are very loosely packed, they have large intermolecular spaces and hence they move around. The particles of solid are closely packed and occupy less space while particles of gases are loosely packed and occupy the complete space available.

Answer:

any of these

Explanation:

kinetic energy: kinetic is motion, or released energy

Potential energy: porential energy is the energy of position or stored energy.

Thermal energy: is heat energy, it is stored energy that creats heat.

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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When fossil fuels burn, several forms of energy are produced, including:

Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.

Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.

Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.

Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.

It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.

Answer:B apez

Explanation:

Answer:

The type of bond is determined by the difference in elecronegtivity of the atom

Explanation:

A P E X

Answer:

B

Explanation:

Answer:

Potential

Explanation:

The actual disinfecting chemical which is included in some surface disinfectants is Phenol.

A chemical agent or compound known as a disinfectant is used to inactivate or eradicate bacteria on inert surfaces.

Alcohols and aldehydes are the chemical sterilant and high-level disinfectants. To eliminate the microorganisms that are found in drains, toilets, and floors, disinfectants like phenol are utilized.

In addition to alcohol, The EPA and the Centers for Disease Control have approved a class of effective surface sanitizers and disinfectants based on quaternary ammonium cations for use as hospital-grade disinfectants.

Aldehydes, like formaldehyde and glutaraldehyde, are sporicidal, and fungicidal, and have a broad range of microbicidal activity. They have a little amount of residual activity and are partially inactivated by organic materials.

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Answer:

11.023 pounds

Explanation:

Answer:

An atom is the smallest particle of an element that still has the properties of that element. Atoms, in turn, are composed of subatomic particles, including negative electrons, positive protons, and neutral neutrons. The number of protons in an atom determines the element it represents.

Explanation:

The smallest possible particle of an element is a atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons.

The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.

Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.  

Therefore, the smallest possible particle of an element is a atom.

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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. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 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. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ 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.

Answer:

\(6118.11\frac{in}{min}\)

Explanation:

Hello,

In this case, by knowing that 1 inch equals 2.54 cm and 60 seconds equals 1 min, the resulting value results:

\(=259\frac{cm}{s}*\frac{1in}{2.54cm}*\frac{60s}{1min}\\ \\=6118.11\frac{in}{min}\)

Best regards.

The concentration of ammonia in the solution is calculated as 4.48*10⁻⁴ M.

In chemistry, the abundance of constituent divided by total volume of a mixture is known as concentration.

C₃H₇COOH + NH⁴⁺ ⇌ C₃H₇COOH⁻ + NH⁴⁺

The propanoic acid (C3H7COOH) is a weak acid with known Ka value (1.3*10^-5), so we use the Henderson-Hasselbalch equation to calculate concentration of the acetate ion (C3H7COO-) in the solution:

pKa = -log(Ka) = -log(1.3*10⁻⁵) = 4.89

pH = pKa + log([C₃H₇COO-]/[C₃H₇COOH])

[C₃H₇COOH] = 0.18 M

[C₃H₇COOH-] = Ka*[C₃H₇COOH]/[H+] = (1.310⁻⁵)(0.18)/10^-pH

Kb = [ NH⁴⁺][OH⁻]/[NH₃]

Kb = [NH⁴⁺][OH⁻]/[NH₃] ≈ [NH⁴⁺][OH⁻]/0

[OH⁻] = Kb*[NH₃]/[NH⁴⁺] = (1.7610⁻⁵)[NH3]/0.18

[H⁺][OH-] = 1.0*10⁻¹⁴

[H⁺] = 10^-pH

NH₃] = [OH⁻] = 1.010^-14/[H⁺] - 2.4910⁻⁷

[NH₃] = 4.48*10⁻⁴ M

Therefore, the concentration of ammonia in the solution is 4.48*10⁻⁴ M.

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a)The molarity of this solution is 0.07 M.

b)The hydronium ion concentration is 0.07 M, and the hydroxide ion concentration is approximately 1.43 x 10^(-13) M.

c)The pH ≈ 1.15 & pOH ≈ 12.85

d)This solution is an acid.

e)HNO₃ + NaOH → NaNO₃ + H₂O

f)HNO₃ is the acid.

NaOH is the base.

NaNO₃ is the conjugate acid of the base NaOH.

H₂O is the conjugate base of the acid HNO₃.

To find the molarity (M) of the solution, we need to calculate the number of moles of solute (hydrogen nitrate) and divide it by the volume of the solution in liters.

a.The molar mass of hydrogen nitrate (HNO3) is 63.01 g/mol.Moles of HNO3 = 3.31 g / 63.01 g/mol = 0.0526 mol

Volume of solution in liters = 750.0 mL / 1000 mL/L = 0.750 L

Molarity (M) = Moles of solute / Volume of solution in liters

M = 0.0526 mol / 0.750 L ≈ 0.070 M

b. Hydrogen nitrate (HNO3) dissociates in water to form hydronium ions (H3O+) and nitrate ions (NO3-). Since the compound is a strong acid, it fully dissociates. Thus, the concentration of hydronium ions and nitrate ions is the same as the molarity of the solution, which is 0.070 M.

c. The pH and pOH can be calculated using the formulas: pH = -log[H3O+] and pOH = -log[OH-]. Since the solution is acidic, [H3O+] = 0.070 M.

pH = -log(0.070) ≈ 1.155

pOH = 14 - pH ≈ 14 - 1.155 ≈ 12.845

d. This solution is an acid since it contains hydronium ions (H3O+), which are characteristic of acidic solutions.

e. The balanced chemical equation for the reaction between hydrogen nitrate (HNO3) and sodium hydroxide (NaOH) is:

HNO3 + NaOH -> NaNO3 + H2O

f. In this reaction, HNO3 acts as the acid (donates a proton, H+), NaOH acts as the base (accepts a proton, OH-), NaNO3 is the conjugate base of HNO3, and H2O is the conjugate acid of OH-.

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Answer:

₰₮₤₳V₤

Explanation:

First you must calculate the number of moles in this solution, by rearranging the equation. No. Moles (mol) = Molarity (M) x Volume (L) = 0.5 x 2. = 1 mol.

For NaCl, the molar mass is 58.44 g/mol. Now we can use the rearranged equation. Mass (g) = No. Moles (mol) x Molar Mass (g/mol) = 1 x 58.44. = 58.44 g.

B. silver tarnishing

Answer:

Explanation:

Atoms are the building blocks of matter.

They are the smallest particles of an element that still have the element's properties.

All atoms are very small, but atoms of different elements vary in size.

Three main types of particles that make up all atoms are protons, neutrons, and electrons.

The balanced chemical equation for the decomposition of aspirin (acetylsalicylic acid) is:

\(2C_{9}H_{8}O_{4} (aspirin) → 2C_{7}H_{6}O_{3} (salicylic acid) + 2CO_{2} (Carbon dioxide) + H_{2}O (water)\)

In this reaction, the aspirin molecule breaks down into salicylic acid, carbon dioxide, and water. The reaction is typically catalyzed by heat or exposure to acidic or basic conditions.

Aspirin, or acetylsalicylic acid, contains ester functional groups that can undergo hydrolysis. Under suitable conditions, the ester bond in aspirin is cleaved, leading to the formation of salicylic acid, which is the primary decomposition product. Additionally, carbon dioxide and water are released as byproducts of the reaction.

The balanced equation shows that for every two molecules of aspirin, two molecules of salicylic acid, two molecules of carbon dioxide, and one molecule of water are formed. Understanding the decomposition of aspirin is important in pharmaceutical and chemical industries to ensure the stability and shelf-life of the compound, as well as to study its breakdown products and potential side reactions.

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Answer:

Rough and irregular surface

these surfaces tends a lot of friction

but on smooth surface there is least friction

hope it helps

To determine the tomato's velocity when it hits the ground, we need more information. Specifically, we need the height from which the tomato was dropped and the tomato mass.

Without these details, it is impossible to calculate velocity accurately. The velocity of an object when it hits the ground depends on factors such as the height of the fall, the mass of the object, and any forces acting on it during the fall (such as air resistance).

If you can provide the necessary information, I can help you calculate the velocity of the tomato when it hits the ground.

The Transcontinental Railroad was the main development that started a large movement of settlers to California. It was the first railway line to span the entire continent, connecting the east and west coasts of the United States.

The railroad greatly facilitated migration and allowed for widespread settlement of the West. It improved communication between the east and west coasts, sped up transportation, and made it possible for a more productive interchange of goods.

Also, the railroad made it possible for prospectors to reach California in search of the California Gold Rush. Also, the railroad made it possible for cattle ranchers to transport their herds of cattle to the California stockyards.

As a result, there was more beef available, which aided in the state's agriculture sector's expansion. Also, the railroad offered an effective way to ship mining and agricultural goods to the east coast.

Hence, the Transcontinental Railroad served as the main driving force behind the massive migration of settlers to California.

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Answer:

\(V_2=2.5m^3\)

Explanation:

Hello!

In this case, according to the Charles' law as a directly proportional relationship between volume and temperature:

\(\frac{V_2}{T_2}=\frac{V_1}{T_1}\)

Thus, in order to compute the final volume, V2, we obtain the following expression:

\(V_2=\frac{V_1T_2}{T_1}\\\\V_2=\frac{5m^3*300K}{600K}\\\\V_2=2.5m^3\)

Best regards!

Answer:

2 Na atoms

1 C atom

3 O atoms

gram formula weight = 105.99 g

hope this helped :)

Explanation:

→ Na

# of Atoms - 2

→ C

# of Atoms - 1

→ O

# of Atoms - 3

→ gram formula weight (g) : 105.99 g

Answer:

\(F>C> H_e\)

Explanation:

From the question we are given

a. He

b. C

c. F

Generally

The electron affinity  of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.

Therefore

The order of electron Affinity is give as

\(F>C> H_e\)

Elements arranged according to increasing electron affinity is He, C, F.

Electron affinity is a measure of the ability of an atom or molecule to attract and accept an electron. It quantifies the energy change that occurs when an electron is added to a neutral atom or ion in the gaseous state.

When an atom or ion gains an electron, it undergoes a process called electron attachment or electron capture. The electron affinity is the energy released or absorbed in this process. A higher electron affinity value indicates a stronger attraction for electrons.

The electron affinity is typically expressed in units of energy, such as electron volts (eV) or kilojoules per mole (kJ/mol). It can be either positive or negative. A positive electron affinity indicates that energy is released when an electron is added, while a negative electron affinity indicates that energy is required to add an electron.

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Answer:

A substance is a form of matter that will have a constant composition of evenly distributed products.

Explanation:

(Has to be the same everywhere)

Answer:

425 nm

Explanation:

If 1 mol = 6.02 * 10^23

The energy (E)= 282 * 10^3/6.02 * 10^23 = 4.684 * 10^-19 J

Now;

E = hc/λ

h = Plank's constant = 6.63 * 10^-34 Js

c = speed of light= 3 * 10^8 m/s

λ = Wavelength of light = ?

4.684 * 10^-19 = 6.63 * 10^-34 * 3 * 10^8/λ

λ  = 6.63 * 10^-34 * 3 * 10^8/4.684 * 10^-19

λ  = 4.25 * 10^-7 m

λ  = 425 * 10^-9 m

λ  = 425 nm

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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