Calculate the molar mass
CaCl2
Ca(NO3)2
Ca(OH)2
CaSO4
BaCl2

Answer:

• Option a) element

Explanation:

There are two kind of substances that may be classified as pure substances: elements and compounds.

Elements are the pure substances whose atoms are all of the same kind (same atomic number). Some xamples of pure substances are sodium (Na), oxygen gas (O₂), hydroge gas (H₂), nitrogen gas (N₂), helium (He), and gold (Au). There are 118 known elements. You can find all of them in a periodic table.

Elements cannot be broken down into simpler substances by chemical or physical means because the simplest substance is the atom.

The only way to break elements into other substances is by nuclear reactions: fission and fusion reactions transform the atoms of an element into different atoms, but those reactions are not considered either chemical or physical changes. Nuclear reactions are a completely different kind of changes.

On the other hand, the other kind of pure substances, compounds, are formed by two or more different elements, and they can be broken down into simpler substances by chemical means. For example, water molecules (H₂O) can be broken down into the elements that constitue them, i.e. hydrogen and oxygen.

Final answer:

An element is a pure substance that cannot be broken down into simpler substances by chemical or physical means. The other options - mineral, chemical, and atom - are not exact fits for the description provided in the question.

Explanation:

An element (option a) is the Correct response to the question. An element is a pure substance that cannot be broken down into simpler substances by chemical or physical means. Elements are the basic building blocks of matter and each element has its own unique atomic structure.

For example, gold, oxygen, and helium are all examples of elements. They each have unique properties and cannot be further broken down into simpler substances through ordinary physical or chemical methods.

The other options - mineral, chemical, and atom - do not accurately fit the description given. A mineral is typically a solid substance with a specific chemical composition and crystalline structure. A chemical may refer to a compound or substance produced by a chemical process. An atom is the smallest unit of an element, but it itself can be divided into protons, neutrons, and electrons.

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The molalconcentration of the solution is 5.38 M.

The molal concentration of sulphuric acid = 6.80 m

The density of the solution = 1.318 g/ml

Mass of the sulphuric acid in the solution is,

The mass of sulphuric acid present in the solution is 666.4 g.

Let the mass of the solvent in which sulphuric acid is dissolved be 1000 grams.

So the total mass of the solution is,

= Mass of solvent + Mass of sulphuric acid

The total volume of the solution is,

The volume of the solution is 1.264 liters.

The molal concentration of this solution is,

Therefore, the molal concentration of the solution is 5.38 M.

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B. the light-independent reaction is the correct answer in Edgen

Answer: molecules

Explanation:

To calculate the moles, we use the equation:

For

Given mass= 165 g

Molar mass of   = 44 g/mol

Putting values in above equation, we get:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number of particles.

1 mole of contains = molecules of  

Thus 3.75 moles contains = molecules of

Thus there will be molecules of

The molar mass of CO2 is 44 grams per mole.

165 grams / 44 grams per mole of CO2 = 3.75 moles CO2

Using Avogadro’s law where 1 mole of substance equals 6.023 x 10^23 molecules

3.75 moles CO2 (6.023 x 10^23 molecules /mole) = 2.26 x 10^24 molecules CO2

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