This is an Engineering question, and the answer is reasonably simple. The mechanical advantage is given by:
MA =

on a lever or ramp system.
MA =

MA = 6.67 (there are no units, as MA is a ratio)
Answer:
LiCl because the total negative charge on Cl is one.
Explanation:
Lithium has a charge of 1+ and Chlorine has a charge of 1-.
Answer: 1.2 x 10^-17 microounces
Explanation:
Ounce = 28.5G microounce = 28.5*10^-6g
3.4*10^-25 kg = 3.4*10^-22 g = (3.4/2.85)*10^(-22+5) = 1.2*10-17