Unit 3.1.2 - Amount of Substance Flashcards
What is the Avogadro’s constant?
The number of particles in one mole of carbon 12
What is the molar mass of something?
The mass of one mole of something
What formula relates moles and grams?
Moles = Mass (g) /Mr
What formula relates moles and volume?
Moles = concentration x volume
When using volume in concentration and mole calculation what unit must in be in?
dm3
How do you convert cm3 into dm3?
divide by 1000
What is the ideal gas equation?
pV = nRT
What does each letter stand for in pV = nRT? and what units must each thing be in?
p - pressure in Pa V - volume in m3 n - number of moles R - gas constant T - temperature in Kelvin
What number is the gas constant?
8.31
How do you convert KPa into Pa?
x1000
How do you convert Celsius into Kelvin?
+273
How do you convert cm3 into m3?
x100000
How do you convert dm3 into m3?
divide by 10000
What does empirical formula show?
The simplest whole number ratio of atoms in a compound
What does molecular formula show?
The number of each type of atom in one mole of the compound
How do you calculate percentage yield?
(Actual yield / theoretical yield) x100
Give two reasons why you never get 100% yield?
- ) the reaction doesn’t go to completion
2. ) reactants or products are lost
How do you calculate percentage atom economy?
(mass of desire products/total mass of products) x100
How can you improve percentage atom economy?
Find a use for the other products
What are ions with a positive and negative charge called?
Positive - cation
Negative - anions
Name five common anions?
hydroxide, sulphate, carbonate, nitrate and hydrogencarbonate
