ELECTRICITY Flashcards
1
Q
the formula for the % mass of an element in a compound.
A
Ar x no. of atoms in the element
———————————————– x 100
Mr of the compound
2
Q
what is Avogadro’s constant?
A
6.23 x 10 ^23
3
Q
number of moles formula
A
mass = Mr x mole
4
Q
at room temp, one mole of any gas occupies how many dm^3
A
24 dm^3
5
Q
the formula to find the volume of any gas at room temp
A
mass of gas
volume of gas = ——————– x 24
Mr of gas
6
Q
the formula for conc in mol/dm^3
A
moles = conc x volume
7
Q
hoe o do convert mol/dm^3 into g/dm^3
A
multiply the mol dm-3 value by the Mr
