Chemistry Unit conversion question

Thread Starter

crazyengineer

Joined Dec 29, 2010
156
Hello,

I just have a quick question about unit conversion. Let say I have 144.6g/mol of GaAs and I divided it by 69.7g of Ga. Does that mean that I get a 2.07 As since the Ga from the compound and Ga from the single element cancels and the masses also cancels?
 

someonesdad

Joined Jul 7, 2009
1,583
No. By 144.6 g/mol, I assume you mean the molecular mass of GaAs; this is the mass of a specified number of atoms (one Avogadro's number of atoms -- if you were to divide 144.6 g by Avogadro's number, then you'd have the mass in g of one GaAs molecule). You also can't "cancel" elements like you intimated -- that's undefined.

If you divide 144.6 g/mol by 69.7 g, you get a number with the units 1/mol.

Why don't you state what it is you're after? Then we can help you get what you want.
 

Thread Starter

crazyengineer

Joined Dec 29, 2010
156
I'm trying to find the Ga atoms/cm^3. The only given is the lattice constant of GaAas (5.43 Angstoms), the molar mass of Ga and the molar mass of As.

I also tried doing this way

I divided the molar mass of Ga by the molar mass of GaAs then multiplied the atoms/cm^3 of GaAs.
 
Top