Chapter 2 - Amount Of Substance Flashcards
What is the Avogadro constant?
The number of particles in one mole of anything. 6.022 x10²³
What is the molecular formula?
The molecular formula is the actual amount of each atom in a compound.
Define the term “empirical formula”
The simplest whole number ratio of the different atoms in a compound.
What is the relative formula mass of an atom?
The average mass of an atom compared to 1/12th the mass of a carbon 12 atom.
State the ideal gas equation.
pV = nRT
What is relative molecular mass?
The average mass of a molecule compared to 1/12th the mass of a carbon 12 atom.
What unit of temperature is required when using the ideal gas equation?
Kelvin
What units are used for volume when using the ideal gas equation?
m³
What are the conversion units between cm³, dm³ and m³?
cm³ x10³ = dm³
dm³ x10³ = m³
Therefore…
cm³ x10⁶ = m³
How do you calculate mass using Mr (RFM) and moles?
Mass = Mr x moles
How do you calculate moles when given concentration and volume?
Moles = concentration x volume
How do you calculate atom economy?
(useful mass out/total mass in) x100
