How many moles are in 15 grams of Lithium oxide? I got 5.0205 mol Lithium oxide but I just wanted to see if anyone else got this.
I used 29.881 for the molar mass of Li2O and obtained 0.50199 mol which round to 0.502 to 3 significant figures.
15.0/29.881 = ?
To determine the number of moles in 15 grams of lithium oxide, you need to know the molar mass of lithium oxide and then use the formula:
moles = mass / molar mass
The molar mass of lithium oxide (Li2O) can be found by summing the molar masses of lithium (Li) and oxygen (O) atoms.
The molar mass of lithium (Li) is approximately 6.94 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol.
Since there are two lithium atoms in lithium oxide, you need to multiply the molar mass of lithium by 2.
Therefore, the molar mass of lithium oxide (Li2O) is:
(2 * 6.94) + 16.00 = 29.88 g/mol
Now, you can calculate the number of moles using the formula:
moles = 15 grams / 29.88 g/mol
moles ≈ 0.50205 mol
So, you calculated it correctly. There are approximately 0.50205 moles of lithium oxide in 15 grams.