EL6 What Are We Made Of? Flashcards
What is one mole of a substance?
The amount of substance that contains as many particles as there are atoms in exactly 12g of ^12C.
What is the value of Avogadro’s constant?
6.022 times 10^23
What is Avogadro’s constant?
The number of atoms per mole as a value of 6.022*10^23.
What tells us one mole of a specific substance?
Its relative atomic mass (g).
What is the molar mass?
The mass of one mole of substance (relative atomic mass).
What is the unit for molar mass?
g mol^-1 (grams per mole).
How do you calculate moles?
Mass (g)/ molar mass (g mol^-1)
What is the relative formula mass?
The sum of the relative atomic masses of a compound’s elements.
What is the empirical formula?
The simplest whole number ratio of atoms of each element present in a compound.
What is the molecular formulae?
The number and type of atoms of each element in a molecule.
What are the units of molar gas volume?
dm^3/mol.
What are water of crystallisations?
Water molecules that are fit within an ionic lattice in a regular manner.
What do the crystals of some ionic lattices’ contain?
Water molecules.
What are crystals within an ionic lattice said to be?
Hydrated.
What happens when hydrated crystals are heated?
The water of crystallisation is removed as steam leaving the anhydrous solid.
