Quantitative Chemistry Flashcards
State what RAM stands for and give its definition.
Relative Atomic Mass
The relative atomic mass of an atom is the mass of the atom compared with the carbon 12 isotope, which has a mass of exactly 12, and it is the weighted mean mass of the mass numbers.
How can you quickly find the RAM?
-> 23
Na
11
State what RFM stands for and give its definition.
Relative Formula Mass
The sum of the relative atomic mass of all the atoms in a formula of a substance
How can you quickly find the RFM?
E.g
H2O = 1 + (16x2) = 33
What is the equation for % of an element in a compound:
Mass of element in compound
________________________________ x100
Total mass of compound
What is a mole?
The mole is an amount of a chemical
The relative formula of a substance in grams is known as one mole of that substance
How do you find one mole of a substance?
Step 1: MgO
Step 2: Mg O
Step 3: 24 + 16
Step 4: = 40g
Basically 1 mole is the RFM
What is the unit of moles
n
How do you find the moles of a substance from its mass?
Moles = mass/RAM
How do you find the mass of a substance from its moles?
Mass = moles x RAM
How many kilograms in a ton?
1000
How many grams in a ton?
1,000,000
How many grams in a kilogram
1000
How many milligrams in a gram?
1000
How many milligrams in a tonne?
1,000,000,000
