A muffin has a mass of 100g and a volume of 500cm^3. What is the density of the muffin

Answer:

Molarity is 13,4M

Explanation:

As mole fraction of chloroform is 0,203; mole fraction of acetone will be 1-0,203=0,797

That means that per 100 moles you have 20,3 moles of chloroform and 79,7 moles of acetone.

Using molar mass and density it is possible to know the volume these moles occupy, thus:

Chloroform: 20,3 moles××= 1637mL= 1,637L

Acetone: 79,7 moles××=  5852mL = 5,852L

That means that total volume is 1,637L + 5,852L = 7,489L

As moles are 100, molarity is:

100mol / 7,489L = 13,4M

I hope it helps!

Final answer:

To determine the molarity of the solution, calculate the number of moles of each compound in the solution, and then divide the total moles by the total volume of the solution. Ensure all units are in the appropriate metric system and take into consideration potential effects of molecular interactions on the total volume.

Explanation:

The first step to calculate the molarity of the solution of chloroform (CHCl3) and acetone (C3H6O) is to determine the number of moles of each compound in the solution. The mole fraction is given as 0.203 for chloroform, therefore the mole fraction for acetone will be 0.797 (since the total mole fraction in a solution is equal to 1).

Next, we calculate the mass of each compound with the known densities. Upon performing these calculations, we then utilise the definition of molarity, which is moles of solute per liter of solution. This can be calculated by knowing the total moles and total volume of the solution. Note that we'd convert all units to the appropriate metric system before carrying out these calculations (density in g/mL, molar mass in g/mol, etc.).

It is also important to consider that the mass and volume of each solution component might not be directly additive due to potential molecular interactions between acetone and chloroform.

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Answer: Option (a) is the correct answer.

Explanation:

In a voltaic cell, salt bridge is used for connecting oxidation and reduction half cells.

The main purpose of using salt bridge in a voltaic cell is that it helps in maintaining electrical neutrality in the internal circuit occurring at anode and cathode of the cell.

Without salt bridge in a voltaic cell there will be imbalance of charges as a result solution in anode compartment will become positively charged whereas solution in cathode compartment will become negatively charged.

Thus, we can conclude that the salt bridge balances charges that may build up as reduction and oxidation occur in a voltaic cell.

The most accurately represented John Dalton's model of the atom is: C. a tiny, solid sphere with a predictable mass for a given element

Further explanation

The development of atomic theory starts from the first term conveyed by Greek scientists who suggested that every substance has the smallest particles so that the word atomos appears, which means it cannot be divided. So, John Dalton, a British scientist put forward the hypothesis about atoms, among others:

• 1. The elements are composed of atoms which are small particles which cannot be subdivided

• 2. Atoms that make up the same element have the same properties, mass, and size, while for different elements, the properties are also different

• 3. Compounds are composed of two or more atoms in a fixed ratio

• 4. In chemical reactions, atoms after and before a reaction cannot be destroyed, only separation and reassembly occur

Point 3 shows the relationship with The Law of Constant Composition of Proust so that further research on atoms is more developed

Dalton's hypothesis is described as a solid sphere like a very small shot put ball or a bowling ball based on Dalton's hobby in bowling

Learn more

Bohr's model of the atom

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Rutherford performed the gold foil experiment

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The part of an atom that is mostly empty space

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Keywords: atom, Dalton, a solid sphere, The Law of Constant Composition

The statement that accurately represents John Dalton’s model of the atom is

Further Explanation:

Postulates of John Dalton’s atomic model:

1. The matter contains indivisible particles. These particles are known as atoms.

2. Atoms can neither be created nor be destroyed.

3. Atoms of the same element show similarity in their shape and mass, but they are different from the elements of the other elements.

4. Atom is the smallest unit that participates in the chemical reaction.

5. Atoms of different elements can form compounds by combining with each other in a fixed, simple and whole number ratios.

6. Atoms of the same element can form two or more compounds by combining in more than one ratio.

Advantages of John Dalton’s atomic model:

1. This theory explains the laws of chemical combination.

2. It provides a clear distinction between atoms and molecules. Atom is the fundamental particle of an element whereas the molecule is that of a compound.

Limitations of John Dalton’s atomic model:

1. It failed to explain the further division of atoms into subatomic particles.

2. It did not mention any concept of isotopes (atoms of the same element with same atomic number and different mass numbers) and isobars (atoms of different elements with same mass number but different atomic numbers).

3. This theory failed to explain the reason for the existence of allotropes.

4. This theory is not applicable to complex organic molecules.

Dalton’s atomic model is also known as the billiard ball model. He assumed atoms to be tiny solid spherical objects similar to the billiard balls. He called these atoms as indivisible particles. But they have some mass for the particular element.

So atom is a tiny solid sphere with a predictable mass for the given element.

Learn more:

1. Rate of chemical reaction: brainly.com/question/1569924

2. Bohr’s model of the atom: brainly.com/question/2965079

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Structure of the atom

Keywords: Tiny, solid, sphere, atom, John Dalton’s model, small particle, indivisible, allotropes, isobars, isotopes, complex, organic molecules, molecules, distinction, fundamental, laws of chemical combination, fixed, simple, chemical reaction.

According to the Bronsted-Lowry concept of acids and bases, a base accepts protons. Here NH₃ accepts a proton to form the conjugate acid NH₄⁺. Hence, it acts as a base.

What is Bronsted-Lowry concept?

There are various theories regarding the nature of acids and bases. According Bronsted-Lowry concept of acids and bases, acids are substances which donates a proton and bases are proton accepters.

The species which is formed by donating a proton from the acid is called conjugate base of the acid and the species which is formed after a base accepts a proton is called the conjugate acid of the base.

Consider the given reaction of ammonia with water. Here water is a proton donor and thus acts as an acid whereas ammonia accepts the proton from water forming its conjugate acid NH₄⁺. Water forms its conjugate base OH-. Therefore NH₃ acts as a base in this reaction.

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Answer:

sulfuric acid

Explanation:

Sulfuric acid is a strong electrolyte.

- Strong electrolytes dissolve completely in water.

Acetic acid and Ammonia is a weak electrolyte.

- Weak electrolytes only partially dissolve in water.

- Hope this helps! If you need further explanation or more help please let me know; I would be glad to help anytime.

Answer:

sulfuric acid

Explanation:

Answer: The given statement is false.

Explanation:

A chemical reaction is a reaction which brings change in chemical composition of reactants resulting in formation of new compounds which have different chemical properties.

For example,

So, when gas is produced in a chemical reaction then it means new compounds are formed due to breakage of old bonds and formation of new bonds.

Thus, we can conclude that the given statement gas produced from a reaction is a phase change and not a chemical change, is false.