Equations

Question 1

Relative atomic mass equation not reverse

Answer 1

(Mass x %) + (Mass x %) / 100

Question 2

Reverse relative atomic mass equations

Answer 2

Ar = (Mass x %) + ( X x %) / 100

Question 3

What is Avagardro constant?

Answer 3

6.02 x 10^23

Question 4

How to workout moles of a gas?

Answer 4

Volume dm3 / 24

Volume cm3 / 24000

Question 5

How to workout moles?

Answer 5

Moles= Mass g / Mr
Mass= moles x Mr
Mr= mass / moles

Question 6

What’s the ideal gas equation

Answer 6

PV= nRT
Pressure X volume = moles X gas constant x temperature

Pressure pascals
Volume metres cubed
Gas constant 8.3 14J mol-1 K -1
Temperature kelvin

Question 7

Calculating number of particles equation

Answer 7

Number of particles number of moles X number of particles in formula unit X 6.02×10^ 23

Question 8

Reverse calculating number of particles

Answer 8

Number of molecules divided by 6.02×10^23 = Number of moles

moles= mass/ mr

Question 9

Moles in solutions calculations

Answer 9

N=CV
C=N/V
V=N/C

Question 10

Moles in solution Cm3

Answer 10

C=n x 1000/v
V= 1000 x n/ C
N=CV/1000

Question 11

How to work out waters of crystallisation

Answer 11

Work out MR
Take away from gmail leaving remaining MR
Divide remaining MR by the MR of water

Question 12

%uncertainty

Answer 12

Percentage uncertainty= error on equipment x times number of measurements taken x 100 quantity measured