Grams in Molecules
Here is some simple assistance on how to find how many grams of a compound are in a number of molecules.
[Note: I do not 100% guarantee that any of my work is correct- it's just done to the best of my abilities- so please double check your answers if following my method to solve a similar problem]
*Remember significant figures! I'm not the best at sig. fig., but hopefully all my work is accurate.*
Problem: How many grams of HF are in 1.25 x 10^25 molecules?
How to solve: Multiply the number of moles by the molecular weight. The number of moles is found by dividing the number of molecules by Avogadro’s number.
1.25 x 10^25 molecules of HF divided by 6.02 x 10^23 (Avogadro’s number) = number of moles of HF (2.10 x 10^1 moles of HF) Then, using moles you have determined, x molecular of HF (20.01 g/mol) = Units cancel, thus give your answer in grams
(4.20 x 10^2 grams of HF)
[Note: I do not 100% guarantee that any of my work is correct- it's just done to the best of my abilities- so please double check your answers if following my method to solve a similar problem]
*Remember significant figures! I'm not the best at sig. fig., but hopefully all my work is accurate.*
Problem: How many grams of HF are in 1.25 x 10^25 molecules?
How to solve: Multiply the number of moles by the molecular weight. The number of moles is found by dividing the number of molecules by Avogadro’s number.
1.25 x 10^25 molecules of HF divided by 6.02 x 10^23 (Avogadro’s number) = number of moles of HF (2.10 x 10^1 moles of HF) Then, using moles you have determined, x molecular of HF (20.01 g/mol) = Units cancel, thus give your answer in grams
(4.20 x 10^2 grams of HF)