F4 Chapter 3: Chemical Formulae and Equations

Question 1

How much is a mole?

Answer 1

Na= 6.02x10^23

Question 2

What are the 3 chemical formulas?

Answer 2

1. No. of Mole= Mass/Molar Mass
2. No. of Mole= Volume/Molar Volume
3. No. of Mole= No. of Particle/Na

Question 3

How much gas does a mole contain at STP and ATP?

Answer 3

STP: 22.4 dm^3
ATP: 24 dm^3

Question 4

What is the relationship between empirical formula and molecular formula/mass?

Answer 4

1. Molecular Formula= (Empirical Formula)n
2. (Empirical Formula)n= Mass of Compound/
   Molecular Mass(RMM)

Question 5

Why is Carbon-12 used to campare with other atoms to obtain mass?

Answer 5

It is easy to handle, solid in room temp, can react with most elements and it is the most abundant isotope