If you have 14g of Li how many grams of LiCl can you make

Question

if you have 14 g of Li how many grams of LiCl can you make ?

2Li + Cl2 = 2LiCl

Answer 1

Okay, so the problem asks you how many grams of LiCl can you make if you have 14g of Li. A good general rule of thumb is to always work in Mols instead of grams.

So,

1. How many mols of Li are in 14g of Li.
2. If you look at the periodic table, you'll see that 1 mol of Li = 6.94g of Li
3. 1 mol Li / 6.94 g = x mol Li / 14 g of Li ; this gives you 2.02 mol of Li
4. Now, you need to ask, how many mols of Li are in each molecule of LiCl? Because there are no subscripts you know that the answer is 1! Therefore there is a 1:1 mol ratio between the two. Because of this 1:1 ratio you now know that you can make 2.02 mol of LiCl.
5. The last step is converting the 2.02 mol of LiCl to grams. So, first you need to determine how many grams 1 mol of LiCl is. To do this you just add the grams for 1 mol of Li and 1 mol of Cl
6. 1 mol of Li = 6.94 g ; 1 mol of Cl = 35.45 g ; therefore 1 mol of LiCl = 6.94 + 35.45 = 42.39 g
7. 1 mol LiCl / 42.39 g LiCl = 2.02 mol LiCl / x g LiCl
8. x = 85.63 g of LiCl