I'm trying to make a mixture of Gallium oxide (M.W = 187.44) and Tungsten Oxide (M.W = 231.85). How can I make a composite of these two different chemicals based on their molecular weights by taking equal amounts of the individual chemicals?
As I know, for making composites, we take weight on balance, but we dot not consider molecular weights
Hi! I think you should work on mole basis. This means:
Since GO molecular weight is 187.44 g/mol and TO molecular weight is 231.85 g/mol, you either can make a composite with an equimolar composition or a "equiweight" composition. Let's see:
An equimolar composition means you need 1 mol of each chemical. In this case, you should weight 187.44 grams of GO and 231.85 grams of TO and prepare de composite.
An "equiweight" composition means you need first to fix how many grams of GO or TO you want to use. For example:
You decide to use 1 gram of GO. 1 gram of GO equals to 1/187.44 mol (0.005 mol of GO). Then you use 1 gram of TO, which equals to 1/231.85 mol (0.004 mol of TO). Your composite now won't be equimolar, because the moles are different for each chemical.
Hope you understand what I meant!
Best of luck!
You can apply this formula for molecules, which is used in stoichiometric ratio calculation for elements. Calculates the weight required for 100 grams of mixture.
Wt%x=100x(at%A)(at.Wt.A)/[(at%A)(at.Wt.A)+(at%B)(at.Wt.B)]
For example, if you are going to use 75% Gallium oxide in 100 grams of mixture, you can calculate as follows:
Wt%Ga2O3=100x(75x187,44)/[(75x187,44)+(25x231,85)]
=70,806 g Ga2O3
Wt%WO3=100x(25x231,85)/[(75x187,44)+(25x231,85)]
=29,194 g WO3
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