B4 Chemistry Flashcards
1
Q
How can you work out the relative formula mass of a compound
A
Add up the relative atomic masses of the elements in it, in the ratio shown by its formula
2
Q
What is a mole of a substance
A
Its relative formula mass in grams
3
Q
What is the formula to calculate the number of moles ?
A
Moles = Mass (g) / relative formula mass
4
Q
What is the Avogadro constant?
A
The number of atoms, molecules or ions in 1 mole of any substance
5
Q
What is the number for Avogadro’s constant
A
6.02 X 10 to the power of 23
