Determining Mass of Lithium What is the mass of 1.3 x 10^(23) atoms of lithium. Lithium has a mass of 6.94, so I assumed that it'd be 6.94 x 1.3 x 10^(23), but that wasn't the case. I wasn't given much practice and I'm not sure how to proceed. Any advice in the right direction is greatly appreciated.

Look up Avogadro's number and the definition of a mole (unit). $6.022\cdot 10^{23}$ atoms with atomic mass of 6.94 will have a total mass of 6.94 grams. By taking a simple ratio, you can figure out how much mass have $1.3\cdot 10^{23}$ atoms