Flashcards in Amount Of Substance Deck (30)
What does amount of substance mean?
The quantity whose unit is the mole
What does mole mean?
Amount of any substance containing as many particles as there carbon atoms in exactly 12g of carbon-12 isotope
What does the Avogadro constant mean?
The number of atoms of the carbon-12 isotope (6.02 * 10 to the 23)
What does molar mass mean?
Mass per mole of a substance measured by grams per mole
What does molar volume mean?
Volume per mole of a gas measured by mole per decimetre cubed
What does empirical formula mean?
Simplest whole number ratio of atoms of each element present in a compound
What does molecular formula mean?
Actual number of atoms of each element in a molecule
What does hydrated mean?
Refers to a crystalline compound containing water molecules
What does anhydrous mean?
Refers to a substance that contains no water molecules
What does water of crystallisation mean?
Refers to water molecules that form an essential part of the crystalline structure of a compound
What does concentration mean?
Amount of solute in moles dissolved in one decimetre cubed of solution
What is the ideal gas equation?
pV = nRT
What is p?
What is P measured in?
How do you convert KPa to Pa?
Multiply by 1000
What is V?
What is V measured in?
How do you convert from centimetre cubed to metre cubed?
Divide by 1,000,000
How do you convert from decimetre cubed to metre cubed?
Divide by 1,000
What is n?
Number of moles
What is R?
The ideal gas constant
What is T?
How do you convert from degrees Celsius to kelvin?
What is temperature measured in?
When do we use the ideal gas equation?
When it is not room temperature and pressure
Why is 100% percentage yield very difficult to achieve?
1) Reversible reaction
2) Reactants may contain impurities
3) By-products may be formed from unexpected reactions
4) Reactants/products may be left in apparatus during the experiment
5) Product may be lost during separation and purification, such as being soaked onto filter paper
How do you calculate percentage yield?
Actual amount over theoretical amount of product in terms of moles or mass times by 100
What is atom economy?
Considers the efficiency of a reaction by looking at the proportion of the products formed that are actually used
Why are reactions with high atom economies so important?
They make better use of finite resources and reduce the need to process and safely dispose of waste products