Quantative Chemistry

Question 1

What is the atomic mass

Answer 1

Protons + neutrons

Question 2

How do you work out the relative atomic mass

Answer 2

Ar= (Mr Isotope 1 X %abundance):-:(Mr Isotope 2 X % abumdance)/100

Question 3

What are isotopes

Answer 3

Same element

Different ammount of neutrons

Question 4

What is the equation for moles

Answer 4

Mass/Mr

Question 5

What is mass also known as in the mole equation

Answer 5

Relative formula molar mass

Question 6

How to work out % of element in compound

Answer 6

Ar of element/Mr of compund X100

Question 7

What is the empirical formula

Answer 7

Compound (g) - element (g)
Then divide each (g) by its own Ar
Then see the ratio

Question 8

Whats % composition

Answer 8

%/Ar for each
Divide each answer by the lowest answer
See the ratio

Question 9

What is % yeild

Answer 9

Actual yeild/predicted yeild X100

Question 10

Why are yeilds always less than 100%

Answer 10

Reaction can be reversable
Filtration
Impurities
Reaction conditions

Question 11

Theoreticle mass/mass equation

Answer 11

Theoretical yeild= Mr X moles