3. Stoichiometry

Question 1

Mole (number)

Answer 1

6.02 * 10²³

Question 2

Solute

Answer 2

A soluble solid that has dissolved in a solvent.

The smalle component of a solution.

Question 3

Solution

Answer 3

The name given to a liquid substance made up of a solvent and solute dissolved in it.

Question 4

Solvent

Answer 4

A liquid substance within which a solid can dissolve.

The larger component of a solution

Question 5

Saturated Solution

Answer 5

A solution containing the maximum concentration of a solute dissolved in the solvent at a specific temperature (cannot dissolve anyomre solid)

Question 6

Molar Gas Volume

Answer 6

Under the same temperature and pressure conditions, equal volumes of different gases will contain an equal number of particles.

1 mole of a gas occupies a volume of 24 dm³ (or 24 000 cm³) at room temperature and pressure (r.t.p.).

Question 7

How to calculate the number of moles of a gas at r.t.p.

Answer 7

Number of moles (n) = gas volume (V) / 24

Question 8

dm³ –> cm³

Answer 8

dm³ * 1000

Question 9

cm³ –> dm³

Answer 9

cm³ / 1000

Question 10

How many dm³ or cm³ in a litre?

Answer 10

1 dm³ = 1 litre = 1000 cm³

Question 11

How do you calculate the amount of moles of a substance there is?

Answer 11

Use the fomula…

Amount of substance (mol) = Mass (g) / Molar mass (g/mol)

Molar mass

The molar mass is the mass of one mole, so it is the same as the relative molecular mass, M r , expressed in grams per mole.

Question 12

Molar calculations with mass

Answer 12

Amount of substance (Number of moles mol) = mass (g) / Molar mass (g/mol)