Out of the following given choices;
A. the size of the atoms in a substance
B. the number of molecules in a substance
C. the position of the electrons on the outer valence shells
D. the balance between intermolecular forces and kinetic energy
The answer is D. The kinetic energy of the molecules is determines by the temperatures of the substance. The higher the temperatures, the higher the kinetic energy of the molecules. The molecules subsequently move and collide with higher energies and overcome intermolecular forces. This allows the substance to changes state from solid to liquid and eventually to gas (with increasing kinetic energy).
In the given question, in 28 grams of molecule 0.636 moles are present.
A mole is the amount of a substance which comprises exactly 'elementary entities' of that substance.
To find the number of moles in 28 grams of , we first need to determine the molar mass of .
Molar mass of = 12.01 g/mol (carbon) + 2(16.00 g/mol) (oxygen)
= 44.01 g/mol
Now that we know the molar mass of , we can use the following formula to calculate the number of moles:
= 0.636 mol
Therefore, there are 0.636 moles in 28 grams of .
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Explanation:
A solution consists of two type of substances. These are solute and solvent.
A solvent is defined as the substance present in lesser amount as compared to a solvent. A solute is able to dissolve in a solvent.
For example, sugar dissolves in water. Here, sugar is the solute and water is the solvent.
Combination of both solute and solvent results in the formation of a solution.
Whereas a solvent is a substance that is present in more quantity as compared to a solute.
Thus, we can conclude that the component which dissolves in a solution is called the solute.
The answer for the following problems is mentioned below.
Explanation:
Mole:
The mass of a substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of .
Given:
volume (v) = 4.7 litres
Volume of argon at STP conditions = 22.4 litres
To find:
volume of argon at STP conditions
We know;
n =
where;
n represents the no of moles
v represents the volume of the argon
V represents the volume of argon at STP
volume of the argon at STP conditions is 22.4 litres
So;
n =
n = 0.20 moles
Therefore the number of moles present in Argon is 0.20 moles.