Chapter 3 - Amount of substance

Question 1

What is the moles equation? (including mass)

Answer 1

Moles = mass / Mr

Question 2

What is the moles equation (Including No. of particles)

Answer 2

Moles = No. of particles/6.02x10^23

Question 3

What is the definition of an empirical formula?

Answer 3

Is the simplest whole number ratio of atoms of each element in a compound

Question 4

When should you stop heating a salt?

Answer 4

When the salt has a constant mass

Question 5

What is the ideal gas equation?

Answer 5

PV = nRT

Question 7

How to convert KPa to Pa?

Answer 7

x1000

Question 8

How to convert Celsius to Kelvin?

Answer 8

+273

Question 9

How to convert cm^3 to m^3?

Answer 9

/1000000

Question 10

What is the gas volume equation at RTP?

Answer 10

V = n x 23 dm^3

Question 11

What is the equation for concentration?

Answer 11

moles = concentration/volume

Question 12

What does M mean?

Answer 12

Molarity = mol dm^-3

Question 13

What is the equation for mass concentration?

Answer 13

Mass = concentration x volume

Question 14

How do you convert between concentrations?

Answer 14

Molar concentration to Mass concentration x Mr
Mass concentration to molar concentration / Mr

Question 15

What is the equation for % yield?

Answer 15

% yield = Actual /theoretical x100

Question 16

What is the equation for atom economy?

Answer 16

Sum of Mr of desired products/ Sum of Mr of all products x 100