Moles

Question 1

What is a mole?

Answer 1

amount of a substance that contains exactly 6.022 x 10^23 ‘elementary entitles’ of the given substance
A mole is a unit of measurement
For example, one mole of carbon, contains 6.022 x 10^23 carbon atoms
1.0 moles of carbon has a mass of 12 grams

Question 2

Mass and mole equation

Answer 2

MM = mass/mol, m = mass, n = number of moles
M = n MM or n = m/MM

Question 3

Moles and number of particles equation

Answer 3

Number of particles (N) = number of moles (n) x Avogador’s number (NA)
N=n NA

Question 4

What is stoichiometry?

Answer 4

• Stoichiometry is founded on the law of conservation of mass where the total mass of the reactant equal the total mass of the products
• Measures quantitative relationships in a reaction, to determine the amount of products and reactants that are produced or needed in a given reaction

Question 5

What is a limiting reagent?

Answer 5

The limiting reagent is the reactant that is entirely used up in a reaction. Once the limiting reagent is used up, the reaction stops and no more products are created, even if other reactants are still present in excess. It is important as it determines the maximum amount of product that can be formed.