Topic 2- Amount Of Substance

Question 1

How would you calculate moles when you have Mr and Mass?????

Answer 1

Mol=Mass/Mr

Moles= Mol
Mass= g
Mr has no units

Question 2

How would you calculate Moles when you have concentration and volume??

Answer 2

Moles= Concentration x Volume
Moles= mol
Concentration= moldm^-3
Volume= dm^3

Question 3

What is the Ideal Gas Equation???

Answer 3

PV=nRT
Pressure=Pa
V=m^3
N= moles
R=8.31 kJ^-1
T=K (Kelvin)
To convert degrees to kelvin you +273 onto the degrees

For Example….
Convert from degrees to kelvin:
15 degrees= 15+273= 288K