C3b - Quantative Chemistry

Question 1

How to find the RAM of an element?

Answer 1

Next to the symbol in periodic table.
The bigger number out of the two.
The top one.

Question 2

How to find the RFM?

Answer 2

The sun of RAM of atoms in a formula.
H2O = H 1 x 2
O 16 x 1
= 18!

Question 3

What does a mole represent? ( AVOGADRO’S CONSTANT)

Answer 3

6.02 x 10 to the power of 23 particles
- molecules
- ions
- atoms

Question 4

How to find 1 mole of C atoms?

Answer 4

1 x (6.02 x 10 to the power of 23) = 6.02 x 10 to the power of 23

Question 5

How to calculate moles from mass(g)?

Answer 5

Moles = mass/ RFM

Question 6

What are the reacting masses?

Answer 6

The predicting mass of reactant needed or mass of product made in a reaction.

Question 7

What are the 3 steps to finding the reacting mass?

Answer 7

1. MOLES
2. RATIO
3. MASS

Question 8

What mass of O2 will react with 192g of magnesium?
2Mg + O2 = 2MgO

Answer 8

1. 192/24 = 8 moles Mg
2. 2Mg moles: 1 O2 mole
   8: 4 moles O2
3. Moles x RFM
   4 x 32 = 128g O2