Biotic factors are the living components or parts of an ecosystem. So the biotic factors would be cacti, salamanders, lizards, and other animals living in a desert. Abiotic factors are the nonliving components in an ecosystem. Some abiotic factors are sand, soil, rocks, and minerals. Hope this helps.
Assuming that the percentage composition is on the basis of weight percentage, therefore the mass of lithium would simply be the product of the two, that is: mass Lithium = 0.188 * 1.70 g mass Lithium = 0.3196 g = 0.32 g
