Lithium has only two stable isotopes. use the sim to determine the following a. atomic mass of lithium-6 = b. atomic mass of lithium-7 = average atomic mass of a sample containing three lithium-6 atoms and two lithiun 4. 6.01512 amu 7.01600 amu c. 6.41548 atoms. amu d. is the average atomic mass you just determined closer to the mass of lithium-6 or lithium-7? explain it 6.41548 is closer to lithium 6 at 6.01512 then lithium 7 at 7.01600 5. describe a method to calculate the average atomic mass of the sample in the previous question using only the atomic masses of lithium-6 and lithium-7 without using the simulation. 6. test your method by creating three sample mixtures of isotopes with the sim and see