Question

How many moles of `S` are in 25 g of `S`?

Answer 1

0.78 mols

Explanation:

From the periodic table, the atomic mass of sulfur (S) is 32.065 g/mol. We can present the atomic mass in either conversion factors:

`("32.065 g S")/("1 mol S") or ("1 mol S")/("32.065 g S")`

To convert from grams to moles, we'll use the atomic mass like this so that the g of S will cancel off each other, giving moles of S:

`"moles of S" = "25" cancel("g S") xx ("1 mol S")/(32.065 cancel("g S")) = 0.78 " mols S"`