Equations

Question 1

How would you find the relative atomic mass from isotopic abundances?

Answer 1

Ar= massxabundance/100

Question 2

How would you find the percentage abundance from a graph?

Answer 2

% abundance= peak height/ total height x 100

Question 3

What is the triangle connecting mass, Mr and amount of substance

Answer 3

Mass/Mrxn

Question 4

What is the triangle connecting Volume, concentration and amount of substance

Answer 4

n/CxV

Question 5

How would you convert mol/dm^3 into g/dm^3

Answer 5

Multiply by the Mr of the compound.

Question 6

How would you convert from cm^3 to dm^3?

Answer 6

Divide by 1000

Question 7

How would you convert from dm^3 into m^3

Answer 7

Divide by 1000

Question 8

What is the traingle linking amount of substance, concentration and volume?

Answer 8

Amount of substance/ Concentration X Volume

Question 9

What is the triangle linking volume and n.o of moles at RTP?

Answer 9

Volume/ Number of molesX24

Question 10

What is the triangle linking volume, number of moles at STP?

Answer 10

Volume/Number of molesX22.4

Question 11

What is the ideal gas equation?

Answer 11

pV=nRT
p=Pressure (Pa)
V=Volume (m^3)
R=Gas constant (8.314)
T=Temperature(K)

Question 12

What is the triangle linking atoms, avogadros constant and amount of substance

Answer 12

Atoms/Amount of substanceXAvogadros constant

Question 13

How do you work out percentage yield?

Answer 13

Percentage yield= Actual yield/theoretical yield