Quantitative Chemistry Flashcards
1
Q
What is relative formula mass ?
A
The relative formula mass is just the relative atomic masses of all the atoms in the formula added together
2
Q
How do you work out the relative formula mass ?
A
1) look up the relative atomic mass on the periodic table
2) add up all the relative atomic masses of all the atoms in the compound
3
Q
How do you calculate the percentage mass of a compound ?
A
Ar X number of atoms of the element / Mr of the compound x100
4
Q
What does Mr and Ar stand for ?
A
Mr = relative formula mass Ar = relative atomic mass
5
Q
How do you calculate the number of moles ?
A
Number of moles = mass (g) / Mr (of element or compound )
