How to Find the Number of Moles in a Compound Given Grams and GFW
The equation to find moles when you know the number of grams and the GFW is...
moles= grams/GFW
moles= grams/GFW
Here are some example problems:
1) If you have 64 grams of O2.
The GFW of O2 is 36.
moles = (64g)/(36GFW)
= 2 moles
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2) If you have 18 grams of H2.
The GFW of H2 is 2.
moles = (18g)/(2GFW)
= 9 moles
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3) If you have 63 grams of H2O.
The GFW of H2O is 18.
moles = (63g)/(18GFW)
= 3.5 moles
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The GFW of O2 is 36.
moles = (64g)/(36GFW)
= 2 moles
======================
2) If you have 18 grams of H2.
The GFW of H2 is 2.
moles = (18g)/(2GFW)
= 9 moles
======================
3) If you have 63 grams of H2O.
The GFW of H2O is 18.
moles = (63g)/(18GFW)
= 3.5 moles
click here to continue learning about how to find the limiting reagent
-or-
click here to go to the limiting reagent quiz