ethanol has a heat of vaporization of 38.56 kj/mol and a vapor pressure of 760 torr at 78.4 oc. what is the vapor pressure of ethanol at 34.1 oc? enter your answer numerically and in terms of torr.

Electromagnet - the strong magnetic field produced inside a solenoid can be used to magnetize a piece of magnetic material like soft iron when placed inside the coil. the magnet so formed is called electromagnet. the magnetic effect remains only till the current is flowing through the solenoid.

electromagnet is used in electric bells

electromagnet is used in electric motors electromagnet is used in telephone diagrams

electromagnet is used in for sorting scrap metals

Hope it helps u

Answer:

i dont know04487448700

In magnesium hydroxide, magnesium makes up 41.7% of the compound by mass, and oxygen makes up 55.1% of the compound by mass. The remaining percentage would be hydrogen.

What is Percentage Composition?

Percentage composition refers to the relative mass of each element in a chemical compound expressed as a percentage of the total molecular mass of the compound. In other words, it is the percentage by mass of each element present in a compound.

To determine the percent composition of magnesium hydroxide in a substance, we need to know the mass of magnesium hydroxide in the substance and the total mass of the substance.

Without knowing the substance in question, we cannot determine the mass of magnesium hydroxide. However, we can use the chemical formula of magnesium hydroxide (Mg(OH)2) to calculate the mass percent of magnesium and oxygen in the compound.

The molar mass of magnesium hydroxide is:

24.31 g/mol (for Mg) + 2(15.999 g/mol) (for 2 O) + 2(1.008 g/mol) (for 2 H) = 58.32 g/mol

The mass percent of magnesium in magnesium hydroxide is:

(24.31 g/mol / 58.32 g/mol) x 100% = 41.7%

(2 x 15.999 g/mol / 58.32 g/mol) x 100% = 55.1%

Therefore, in magnesium hydroxide, magnesium makes up 41.7% of the compound by mass, and oxygen makes up 55.1% of the compound by mass. The remaining percentage would be hydrogen.

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The foram fossils from two different periods are different in terms of size, shape, and diversity.

Forams or Foraminifera are single-celled organisms that form shells of diverse shapes and sizes. Foraminifera can be found in most marine environments, from the deep sea to the intertidal zone. They have existed on Earth for more than 500 million years. The foram fossils from different periods are different in terms of size, shape, and diversity. Some of the differences are explained below:Silurian Foram FossilsForam fossils from the Silurian period are often small, with diameters ranging from 1.5 to 5 mm. They have a simple form with a rounded or oval shape, and their shell is composed of a single chamber.

Cretaceous Foram Fossils Foram fossils from the Cretaceous period are much larger than those from the Silurian period. They can range in size from less than 1 mm to over 10 cm in diameter. They are also more diverse in shape and structure. Some forams have complex, spiral-shaped shells, while others have a more tubular shape. These forams often have intricate internal structures that can be observed under a microscope.

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Answer:

Explanation:

The amount of daughter product that should be present after 5 half-lives depends on the specific radioactive decay process involved and the initial amount of the parent substance. In general, after each half-life, the amount of the parent substance decreases by half, and the corresponding amount of the daughter product increases by half.

In this case, with 5 half-lives gone by, the amount of the parent substance should have decreased by a factor of 2^5 = 32. Hence, the amount of the parent substance should be .03125/32 = 0.0009765625 grams.

Since the amount of daughter product is proportional to the amount of the parent substance that decays, the amount of daughter product should be 0.0009765625 * 32 = 0.03125 grams.

During a chemical reaction, the concentrations of the reactants and products reach a constant level when the reaction reaches equilibrium.

At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, meaning that the concentrations of both the reactants and products remain constant. The equilibrium concentration of each product and reactant is determined by the reaction's equilibrium constant, which is unique for each reaction.
Hi! During a chemical reaction, the point at which the concentrations of the reactants and products reach a constant level is defined as "equilibrium." At equilibrium, the rate of the forward reaction (formation of products) is equal to the rate of the reverse reaction (formation of reactants), resulting in constant concentrations of both reactants and products.

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Answer:

Explanation:

as we know in a face-centered unit each atom give1/2 a portion at the face

and fully atom involvement at center therefore  

1/2( total face of cube )+ 1(centre)

1/2 ×6 + 1

3+ 1

4 atoms per cell

Answerfirst one

Explanation:

Step-by-step explanation:

The number of carbon atoms present in the structure is 5

Each carbon atom carry four hydrogen atoms

The above organic structure is Pentane

Having a molecular formula of C5H12

Answer:

The atomic number would be 12.

Explanation:

A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons.

Answer:

20 cm

Explanation:

so if it goes 2 cm per minute and it goes for ten minutes then the equation

would be 10x2=20

so 20 is the answer

Hope this helps :))

Answer:

20 cm

Hope this helps

Sorry if it is wrong

Answer:

m = 1.047 kg

Explanation:

Volume occupied by the object, V = 0.253 dm³

1 dm³ = 1000 cm³

0.253 dm³ = 253 cm³

Density of the object, d = 4.14 g/cm³

We need to find the mass of the object. Mass per unit volume is called density of an object.

\(d=\dfrac{m}{V}\\\\m=d\times V\\\\m=4.14 \ g/cm^3\times 253\ cm^3\\\\m=1047.42\ g\)

or

m = 1.047 kg

So, the mass of the object is 1.047 kg.

The percent composition  of this compound :

Mg = 72.182%

N = 27.818%

Given

9.03 g  Mg

3.48 g  N

Required

The percent composition

Solution

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

Total mass of the compound :

= 9.03 g + 3.48 g

= 12.51 g

The percent composition :

Mg : 9.03/ 12.51 g x 100% = 72.182%

N : 3.48 / 12.51 g x 100% = 27.818%

The oxidizing agent in the reaction of alcohol dehydrogenase is NAD+..

In the alcohol dehydrogenase reaction:

CH3-CH2OH + NAD+ → CH3-CHO + NADH + H+

The oxidizing agent is the species that gains electrons and gets reduced during the reaction. In this case, it is:

b. NAD+

NAD+ gains electrons and is reduced to NADH, while ethanol (CH3-CH2OH) loses electrons and is oxidized to acetaldehyde (CH3-CHO). So, the oxidizing agent in this reaction is NAD+.

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By halogenating an alkane, it is feasible to produce high yields of 1-chloro-2,2-dimethylpropane. Therefore, following radical halogenation of the parent alkane, only one monohalo isomer is feasible.

A double-branched chain alkane containing five carbon atoms, neopentane is also known as 2,2-dimethylpropane. Neopentane is a flammable gas at ambient pressure that, on a chilly day, in an ice bath, or when compressed to a higher pressure, can condense into a highly volatile liquid known as dimethylpropane. In organic chemistry, an alkane is an acyclic saturated hydrocarbon, sometimes known as paraffin (a historical quaint word that also has various meanings). In other terms, an alkane is made up of carbon and hydrogen atoms that are all grouped in a tree form.

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Answer: 0.224

Explanation: because i added them up

Answer:

2580 years

Explanation:

Since isotope Z has a half-life of 645 years, that means after 645 years, half of the original amount of isotope Z will decay. So, if 1/16 of the original amount is present, that means there have been 4 half-lives (since 2^4 = 16).

Each half-life is 645 years, so 4 half-lives is 4 x 645 = 2580 years.

Therefore, the age of the sample is 2580 years.

a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.

b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.

c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.

d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.

a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.

At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.

b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.

This will give you the U_min for the interaction.

c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).

The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.

This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.

d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.

e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.

This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.

The value of r_s represents the separation at which the attractive force between the atoms is strongest.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.

This will give you the magnitude of the maximum attractive adhesion force between the atoms.

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Answer:

21

Explanation:

The new volume of a gas at STP that occupies 16L of space is 27.43L.

The volume of a given gas can be calculated using the following expression:

P1V1/T1 = P2V2/T2

Where;

1 × 16/273 = 2.6 × V2/468

16/273 = 2.6V2/468

0.0586 × 468 = 2.6V2

V2 = 27.43

Therefore, the new volume of a gas at STP that occupies 16L of space is 27.43L.

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The evaporation of water from your skin is an example of an endothermic reaction because heat is lost from the body as the water evaporates from the skin.

Based on the heat changes that occur in reaction, reactions can be classified into two types;

Exothermic reactions are reactions in which the heat content of the reactants is greater than the heat content of the products. Hence, heat is given out during the reaction. An example is the dissolution of acids in water.

Endothermic reactions are reactions in which the heat content of the reactants is less than the heat content of the products. Hence, heat is absorbed during the reaction. An example is the evaporation of water from the skin.

Other types of endothermic reactions are the melting of ice and thermal decomposition.

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Answer:

Nucleus and mitochondria. Organism.

Explanation:

The two main organelles are the nucleus and the mitochondria . The nucleus is boss of the factory(controls everything). The mitochondria is the power house of the cell (provides the energy). Humans are organisms (made of organs systems working together) . Another example is plants they are also organisms

Answer:

%m/v =70%

Explanation:

El %m/v es una unidad de concentración que se define como cien veces la división entre la masa de una sustancia (En gramos) y el volumen total en el que esta sustancia se encuentra (en mL).

En el problema, debemos hallar la masa de etanol (Alcohol) y el volumen total de la solución.

Masa alcohol:

Ya te la dan en el problema: 105g

Volumen solución:

Volumen agua: 15mL

Volumen etanol: 105g × (1mL / 0.798g) = 131mL

Volumen Jabón líquido: 4.5g × (1mL / 1.5g) = 3mL

Volumen: 15mL + 131mL + 3mL

149mL

Así, el %m/v de alcohol en la solución es:

%m/v = (105g / 149mL) × 100

When a drug is administered as a salt, it is typically combined with an appropriate counterion to form a salt form of the drug. This salt form enhances the solubility of the drug in aqueous solutions, which can improve its bioavailability and allow for better dissolution and absorption in the body.

The correct answer is Many drugs are administered as salts rather than as the corresponding neutral compounds because salts often have greater water solubility and stability. This is important for effective delivery and absorption of the drug in the body. Furthermore, salts often provide improved stability compared to the corresponding neutral compounds. The addition of counterions in the salt form can enhance the chemical and physical stability of the drug molecule, protecting it from degradation or hydrolysis.

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A chemical reaction where heat is absorbed is called an endothermic reaction.

What is an endothermic reaction?

An endothermic reaction is a type of chemical reaction in which heat is absorbed from the surroundings, resulting in a decrease in temperature. This means that the energy required for the reaction to occur is supplied by the environment, and the products of the reaction have a higher energy than the reactants. Examples of endothermic reactions include the dissolving of ammonium nitrate in water and the reaction between baking soda and vinegar.

The formula for the enthalpy change, or heat of reaction (ΔH), for an endothermic reaction is: ΔH = heat absorbed by the reaction (positive value)

The enthalpy change is typically represented in units of energy per mole of reactant, such as joules per mole (J/mol) or calories per mole (cal/mol). The sign of ΔH is positive for endothermic reactions, since heat is absorbed by the reaction.

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Answer:

pH = 0.30

Explanation:

Hello there!

In this case, according to the given information about the acid, before we calculate the pH we must compute the final concentration of the acid after the dilution process:

\(M_2=\frac{10.00mL*5.00M}{100.00mL}=0.5M\)

Thus, since this strong acid is 100% ionized, the concentration of hydrogen ions will be also 0.5 M and therefore the pH:

\(pH=-log(0.5)\\\\pH=0.30\)

Best regards!

Molecules of water were attracted to the negatively charged plastic tube due to electrostatic forces.

Electrostatic forces refer to the attraction or repulsion of different particles in the system because of their charges. They are a type of physical force, just like the gravitational force. For example, the molecules of water are polar, which means they have positively and negatively charged ends.The negatively charged oxygen atom of a water molecule is attracted to positively charged ions. Simultaneously, its positively charged hydrogen atom is attracted to negatively charged ions.

When these polar molecules are introduced to a charged surface, such as a negatively charged plastic tube, they experience an electrostatic attraction towards the surface. The molecules of water are attracted to the negatively charged plastic tube due to electrostatic forces. This force of attraction is known as an adhesive force. When the attraction is stronger than the cohesive force between the water molecules, they start moving towards the surface, causing them to stick to the plastic tube.This concept is used in many everyday items, such as plastic cups, to avoid spillage of liquid. The interior surface of the cup is usually made of a material that has a higher attraction force than the cohesive force of the liquid, preventing it from spilling.

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