5. using moles

Question 1

one mole of particles

Answer 1

is the number of particles obtained by weighing out the Ar or Mr of the substance in grams

Question 2

one mole of a substance

Answer 2

is 6.02 x 10^23 particles of that substance

Question 3

molar mass

Answer 3

1. write down symbol or formula
2. find Ar or Mr
3. express in grams

Question 4

Avogadro’s Law

Answer 4

1 mole of every gas has the same volume at a given temperature and pressure

(room temp nd pressure –> 24dm^3)

Question 5

concentration

Answer 5

amount of solute that is dissolved in 1dm cube of solution

Question 6

finding concentration in moles

Answer 6

1. find Mr of solute
2. concentration (mol/dm^3) = amount of solute (mol) / volume of solution (dm^3)

Question 7

Empirical formula

Answer 7

elements that combine
masses that combine
relative atomic mass (Ar)
moles of atoms that combine
ration in which atoms combine
empirical formula

Question 8

finding molecular formula

Answer 8

1 calculate Mr / empirical mass
2. multiply number of atoms by ans