Question

how do you calculate moles ?
PLEASE HELP !

Answer 1

As in converting from grams to moles or how much of a certain element is in a mole?

Answer 2

Both !

Answer 3

Well to find out how much of an element is in a mole you can look at the periodic table.

Example: Oxygen has a molar mass of 15.99 grams so in 1 mole of oxygen there is 15.99 grams.

Answer 4

Converting from grams to moles is a little different but follows the same principle.

Lets say we have 43 grams of Lithium. There are 6.94 grams of Lithium for every mole so

\[43 grams of Li \times \frac{ 1 mole }{ 6.94 grams of Li }\]
so the grams of Li cross out and you end up doing 43 x 1 which is 43
then you divide that 43 by 6.94.

So you end up with 6.195 moles of Li

Answer 5

For Solving this Question, I would like to ask you that, do you have the detailed conception of : Mole concept

Answer 6

Moles= mass in grams ÷ molar mass