Topic 3 - Quantitative Chemistry Flashcards
1
Q
What is relative formula mass (Mr)
A
Relative atomic masses of all the atoms
2
Q
How do you calculate % mass of an element in a compound
A
Ar x number of atoms in that element/Mr of the compound x 100
3
Q
Avogadro’s constant
A
6.02x10^23
4
Q
1 mole of atoms/molecules of any substance correlates to
A
mass in grams equal to the relative formula mass
e.g carbon Ar of 12 - 1 mole of C weighs 12g
5
Q
Formula for number of moles
A
Number of moles = mass in g (of element or compound)/Mr (of the element or compund)
6
Q
The limiting reactant is
A
The reactant that’s used up
7
Q
The amount of product formed is directly proportional to
A
The amount of the limiting reactant
