Chemistry Unit conversion question

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?

 

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.

 

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.