Use the next data listed below to calculate the enthalpy of formation (∆H
0
298) for MgCO3 (s.) at 298 K

Answer:

1.51448 atms

Explanation:

1. The % concentration is 20.7% and the molar concentration, Cm, is 1.5 M.

2. 7.8 grams of potassium sulfate will be formed.

3. 10.7 grams of ammonium chloride will be formed.

4. The volume of hydrogen gas that will be produced is 3.86 liters.

5. 21.43 grams of the 70% acetic acid is needed to prepare 500 grams of 3% acetic acid solution.

1. Mass of potassium sulfate = 1.5 moles * (174.26 g/mol) = 261.39 g

Mass of water (H₂O) = 1000 g

% = (mass of solute/mass of solution) x 100

% = (261.39 g / (261.39 g + 1000 g)) x 100

% ≈ 20.7%

Cm = moles of solute / volume of solution

Moles of potassium sulfate (K2SO4) = 1.5 moles

Volume of water (H2O) = 1000 g / (density of water) = 1000 g / 1 g/mL = 1000 mL = 1 L

Cm = 1.5 moles / 1 L

Cm = 1.5 M

2. The balanced equation for the reaction is:

H₂SO₄ + 2 KOH → K₂SO₄ + 2 H₂O

Molar mass of sulfuric acid (H₂SO₄) = 98.09 g/mol

Moles of sulfuric acid = 10 g / 98.09 g/mol

Moles of sulfuric acid = 0.102 mol

Based on the mole ratio of the reaction, 0.102 moles of sulfuric acid will react to form 0.102 moles of potassium sulfate.

Molar mass of potassium sulfate = 174.26 g/mol

Mass of potassium sulfate = 0.102 mol x 174.26 g/mol

Mass of potassium sulfate ≈ 17.8 g

3. The balanced equation for the reaction is:

Molar mass of hydrochloric acid (HCl) = 36.46 g/mol

Moles of hydrochloric acid (HCl) = 7.3 g / 36.46 g/mol

Moles of hydrochloric acid ≈ 0.2 mol

Based on the mole ratio of the reaction, 0.2 moles of hydrochloric acid will react to form 0.2 moles of ammonium chloride.

Molar mass of ammonium chloride (NH₄Cl) = 53.49 g/mol

Mass of ammonium chloride = 0.2 mol x 53.49 g/mol

Mass of ammonium chloride ≈ 10.7 g

4. The balanced equation for the reaction is:

Molar mass of zinc (Zn) = 65.38 g/mol

Moles of zinc = 13 g / 65.38 g/mol

Moles of zinc ≈ 0.199 mol

Based on the mole ratio of the reaction, 0.199 moles of zinc will react to produce 0.199 moles of hydrogen gas.

Volume of sulfuric acid = 30 g / (density of H₂SO₄ )

The density of H₂SO₄ is 1.84 g/mL

Volume of sulfuric acid  = 30 g / 1.84 g/mL

Volume of sulfuric acid ≈ 16.3 mL or 0.0163 L

Using the ideal gas law, the volume of hydrogen gas produced will be:

V = nRT / P

V = (0.199 mol)(0.0821 L·atm/(mol·K))(273 K) / (1 atm)

V ≈ 3.86 L

5. Assuming that the concentrated original solution of acetic acid is 100% acetic acid (CH₃COOH).

Mass of acetic acid = 500 g x (3/100) = 15 g

The concentrated original solution, however, is 70% acetic acid.

70% acetic acid (mass) = 100% acetic acid (unknown mass)

0.7 * (unknown mass) = 15 g

Solving for the unknown mass:

unknown mass = 15 g / 0.7

unknown mass ≈ 21.43 g

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The average weight loss is 0.739 mg/s.

The total weight lost by the individual = 15 lb

To convert Ib to mg

1 Ib = 453592 mg

15 lb = 15 lb * 453592 mg/ 1 Ib

= 6803880 mg

The time taken for the weight loss = 3.5 months

Number of seconds in 3.5 months = 9.198 * 10^6 seconds

Hence;

Average weight loss in milligrams per second (mg/s);

Weight lost/ time taken

6803880 mg/9.198 * 10^6 seconds

= 0.739 mg/s

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\(\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{6-20}{6}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{-14}{6}\)

\(\\ \sf\longmapsto Acceleration=-2.3m/s^2\)

250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Answer: here is your answer

Explanation: You are visiting your Grandmother and notice that she is eating a balanced diet, taking vitamins, getting the proper amount of sleep and is not overweight. Despite her healthy lifestyle, she appears run down and tired. You realize that it's due to her lack of physical activity. Write a convincing letter to your grandma explaining the benefits of participating in regular physical activity.

Answer:

Replacement is your answer

Answer:

50x10^0

Explanation:

Yes, s = u+v/2+t, where s is the displacement, u is the beginning velocity, v is the end velocity, and t is the time required, is the equation of motion for a body travelling with uniform acceleration.

The basic law of motion, which states that a body's rate of change in displacement is directly proportional to its velocity, provides the basis for this equation. The equation of motion for a body travelling with constant acceleration, s = ut + 1/2at2, may be used to derive it.

The equation of motion for a body travelling with uniform acceleration is given by replacing the value of an as (v-u)/t and getting s = u+v/2+t. This formula is only accurate when the body's acceleration is constant and uniform.

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If a penguin has to walk 70 miles at a rate of .75 meters per second, 66  days do it take to make the trip.

The term speed is defined as the rate of change of position of an object in any direction. Speed is calculated as follows: speed = distance × time.

The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.

If you know how far something has traveled and how long it took to get there, you can calculate its average speed.

Time = distance / speed

distance = 0.75 meters

speed = 70 miles = 112.654 kilometres

Substitute this value in above formula

Time = 0.75 / 112.654

= 0.66

Thus, If a penguin has to walk 70 miles at a rate of .75 meters per second, 66  days do it take to make the trip.

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Taking into account the definition of dilution, 16.67 mL of 12 M hydrochloric acid is needed to prepare 100. mL of a 2.0M solution.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

12 M× Vi = 2 M× 100 mL

Solving:

Vi = (2 M× 100 mL)÷ 12 M

Vi= 16.67 mL

In summary, 16.67 mL of 12 M hydrochloric acid is needed to prepare 100. mL of a 2.0M solution.

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Answer:

1. acid produced by plants growing on rocks

plz give me BRAINLIEST answer

Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

The number of moles of hydrogen gas produced from 1.2 g of water is 0.06 moles. Then, the partial pressure of hydrogen gas is 4.9 atm.

The partial pressure of a gas in a mixture is the contribution of the gas to the total pressure of the mixture.

The molar mass of water = 18 g/mol

mass = 1.2 g

number of moles  = 1.2/18 =0.06 moles.

now the total pressure p = nRT/v

V = 0.20 L

T = 30°C =303 K

then  p = (0.06 mol × 0.082 L atm/ K mol × 303 K) / 0.20 L = 7.4 atm.

Now, 2 moles of water gives 2 moles of hydrogen gas and one mole of oxygen. Then 0.06 moles of water gives 0.06 moles of hydrogen and 0.03 moles of oxygen.

Then, mole fraction of hydrogen = 0.06/(0.03 + 0.03) = 0.66.

Partial pressure of hydrogen = total pressure × mole fraction

= 0.66 × 7.4 atm = 4.9 atm.

Therefore, the partial pressure of hydrogen gas is 4.9 atm.

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ANSWER

Heterogeneous mixture

EXPLANATION:

Given information

From the above image, we can see that we have three elements named a, b, and c. The elements a and c are attached to each other while element b can move freely.

Recall that, the combination of two or more elements is called a compound.

The above image shows the combination of a compound and an element

Hence, we can say that it is a heterogeneous mixture

The helium gas would occupy 1523 L volume at a pressure of 1.00 atm.

What is volume?

We can use the combined gas law to solve this problem:

(P1 x V1) / T1 = (P2 x V2) / T2

where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2 is the final pressure we want to find, V2 is the final volume we want to calculate, and T2 is the final temperature which we assume to be constant.

We can rearrange the equation to solve for V2:

V2 = (P1 x V1 x T2) / (P2 x T1)

Substituting the given values:

V2 = (29.0 atm x 19.0 L x 273 K) / (1.00 atm x 298 K)

V2 = 1523 L

Therefore, the helium gas would occupy 1523 L at a pressure of 1.00 atm.

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Complete question is: A sample of helium occupies 19.0 at a pressure of 29.0 atm. 1523 L helium gas occupy at a pressure of 1.00 atm

Explanation:

NH3 is very soluble in water

CH4

CH3OH is soluble in water because of the hydrogen bonds it has.

CH3CH2OH is also soluble in water.

-----

CH4 is the least soluble in water in comparison with the others.

CH4 is soluble in ethanol, d

Answer: CH4

Answer: It is option 4

Explanation:

The Chlorine have to share 2 electrons

Answer:

A

Explanation:

If Hydrogen is H₂  There will be two silver

and is Carbon is C There will only be one gray

and if Oxygen is O₃ There will be three red

a very strong Abiotic factor in the world is the sun it let's off vitamin d and it can burn humans to were you get skin cancer so the sun

Answer:

There is no graph

Explanation:

The ratio of the carbon to the rest of the atoms in the compound would be 2.49375 to 3.9901 of hydrogen, and 1.00 of oxygen.

The ratio of an atom to the rest of the atoms in a compound can be determined by knowing the empirical or molecular formula of the compound.

Now, the compound in question contains C, H, and O.

Let's divide the mol f each atom by the mol of the smallest. the smallest in this case is 2.00 moles.

C = 4.9875/2.00 = 2.49375

H = 7.9802/2.00 = 3.9901

O = 2.00/2.00 = 1.00

Thus, the ratio for carbon is 2.49375 to 3.9901 of hydrogen, and 1.00 of oxygen.

The empirical formula of the compound is \(C_2H_4 O\).

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The ratio of C if 4.9875 mol C, 7.9802 mol H, and 2.00 mol O are present in the sample is 2.5.

Empirical formula is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.

The empirical ratio to derive the empirical formula can be calculated by dividing the number of moles of each element by the smallest value.

According to this question, there are 4.9875 mol C, 7.9802 mol H, and 2.00 mol O in the sample. The smallest mole is 2 moles.

Therefore, the empirical ratio of carbon in the compound is 2.5.

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Answer: 345,000 calories

Explanation:

Calories in food such as candy bars refer to the amount of energy that the food has. Calories are also called Kilocalories because they are the equivalent of 1,000 calories.

If the candy bar contained 345 calories therefore, and 1 Calorie is 1,000 calories, the calories in the candy bar are:

= 345 * 1,000

= 345,000 calories

Answer:

c

Explanation:

Answer:

Explanation:

Increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.

In the given chemical equation, the reaction between barium sulfide (BaS) and oxygen gas (O2) produces barium sulfate (BaSO4).

When the amount of oxygen is increased in the reaction, it would favor the production of more barium sulfate. This is because oxygen acts as a reactant in the formation of barium sulfate. By increasing the concentration or availability of oxygen, more oxygen molecules will be available to react with the barium sulfide. The increase in oxygen will provide more oxygen atoms for the formation of sulfate ions (SO4^2-) from the sulfide ions (S^2-) in barium sulfide. Consequently, more barium sulfate will be produced in the reaction. Therefore, increasing the amount of oxygen in the reaction would result in an increased yield of barium sulfate, as long as there is an adequate supply of barium sulfide.

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Light below the necessary critical frequency doesn't eject electrons from metal because no electrons will be emitted when the light shines on the metal.

This is a term in physics which is used to describe the number of occurrences of a repeating event per unit of time.

The amount of energy which is present in each photon in the beam is determined by and proportional to the frequency of the beam. This therefore means that if there is light which is below the threshold frequency, there will be no electrons emitted when light shines on the metal thereby making it the correct choice.

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Answer:

option A is the most supported hypothesis by astronomers

Answer:

The Atomic mass of Silver is 107.8682u

Answer:

107.8682 u

Explanation:

Hope this will help

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.