What is a mole?
6.02 x10^23 atoms
A gram of an element
What is avigadro's number?
Avigadro's constant or number is the number of atoms in a mole; 6.02 x10^23
What is meant by 'Structure of matter'?
How different matter is created:
atoms ---> molecules ---> bulk compound
atoms ---> bulk element
atoms ---> ions ---> bulk ionic compound
How elements are structured in different temperatures
What is RAM?
Relative atomic mass; the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12. RAM is averaged over the different isotopes.
Memory in my computer
Find the RAM of Carbon, Magnesium and Francium respectively
6, 12, 87
12, 24, 223
What is meant by molecular mass?
Molecular mass is the total mass of all the molar masses of atoms in a molecule
Molecular mass is the mass of a molecule of CO2
Molecular mass is the mass of one atom in a mole
What is the difference between RAM and AMU?
Atomic Mass Units make up the Relative Atomic Mass
Relative Atomic Mass is the average mass of an element, when considering all its isotopes. Atomic Mass Unit is one twelfth of a carbon atom.
Relative Atomic Mass is the Atomic Mass Unit divided by the number of atoms involved
What is the formula for the number of moles?
Moles= Total Mass/ Molecular Mass
Moles= Total Mass/ Relative Atomic Mass
Moles = Total Mass/ 6.02x10^23
Find the Empirical Formula for NaOH + P4 +H2O --> PH3 + NaH2PO2
3NaOH + P4 +6H2O --> PH3 + 3NaH2PO2
3NaOH + P4 +3H2O --> PH3 + 3NaH2PO2