Chapter 8 - Mole

Question 1

Formula for mole (when mass of s,l,g is involved)

Answer 1

Mole = mass divided by Ar/MR

Question 2

Formula for mole (when volume of g is involved )

Answer 2

Mole = volume divided by 24dm3

Question 3

Formula for concentration (mol/dm3) - derive from formula

Answer 3

Concentration is mole divided by volume

Question 4

Formula for concentration (g/dm3) - derive from formula

Answer 4

Concentration = mass divided by volume

Question 5

Formula for concentration (mol/dm3) from g/dm3

Answer 5

Concentration (mol/dm3) = concentration (g/dm3) divided by Mr

Question 6

Cm3 to dm3

Answer 6

Divide by 1000

Question 7

Mol/dm3 to g/dm3

Answer 7

Times Mr

Question 8

Formula for Density (g/dm3) - to find density of g

Answer 8

Mr divided by 24dm3

Question 9

Formula for density (g/dm3) - when density of liquid is asked for

Answer 9

Mr divided by volume

Question 10

Element (Mg)

Answer 10

Mg = 24

Question 11

Element (O2)

Answer 11

16 times 2 = 32

Question 12

Simple molecular -2 carbon dioxide(co2)

Answer 12

2 CO2 = 12 + (2 times 12)
Din tends to care about the number at front

Question 13

Ionic- 2 cuco3 (copper carbonate)

Answer 13

2 CuCO3 = 64 + 12 + (16 times 3)
Can ignore the two in the front

Question 14

Define relative atomic mass

Answer 14

Average mass of one ATOM of substance compared with 1/12 mass of one atom of carbon-12

Question 15

Define relative molecular mass

Answer 15

Average mass of one MOLECULE of the substance compared with 1/12 mass of one atom of carbon-12

Question 16

Define mole

Answer 16

Amount of substance that contains 6times 10 to the power of 23 particles

Question 17

Define Avogadro constant

Answer 17

6 times 10 to the power of 23

Question 18

Define molar mass

Answer 18

Mas of one mole of any substance(g/mol)

Question 19

Define molar volume

Answer 19

Volume of 24dm3 that one mole of any gas occupies at room temperature and pressure

Question 20

What is meant by concentration of a solution

Answer 20

Concentration of a solution is given by the amount of solute dissolved in a unit volume of the solution

Question 21

What is meant by a solution of 1mol/dm3

Answer 21

The solution has one mole of solute dissolved in 1dm3 of solution

Question 22

Define limiting reactant

Answer 22

Reactant that is completely used up in a reaction

Question 23

Define excess reactant

Answer 23

Reactant that is added in excess and is left unreacted