Moles and Volumes

3.1, 3.3 and 3.4

What is the equation for number of moles

How many cm³ are in a ml

1

How many cm³ are in a litre

1000

How many cm³ are in a dm³

1000

What is the formula for concentration

What is a standard solution

A standard solution is a solution of known concentration

How are standard solutions prepared

Standard solution are prepared by dissolving an exact mass of the solute in a solvent and making up the solution to an exact volume

What is the molar gas volume

Molar gas volume is the volume per mole of gas molecules at stated temperature and pressure

What is formula of number of moles of gas at RTP

What 4 assumption are made for the ideal gas equation

1. Random motion

2. Elastic collisions

3. Negligible size

4. No intermolecular forces

What is the ideal gas equation

Describe the conversions necessary for the ideal gas equation

1. cm³→ m³ x10^-6

2. dm³→ m³ x10^-3

3. C → K +273

4. kPa → Pa x10³

Why is it not possible to achieve 100% percentage yield

1. Reaction may not have gone to completion

2. Side reactions may have taken place

3. Purification may have resulted in loss of product

What is the formula of percentage yield

What is the limiting reagent

Limiting reagent is the reactant that is not in excess and will be used up first thus will stop the reaction

What is atom economy

Atom economy of a chemical is a measure of how well atoms have been utilised

What are 2 features of reactions with high atom economies

1. They produce a large proportion of desired products and few unwanted waste products

2. They are important for sustainability as they make the best use of natural resources

What is the equation of atom economy