The order of the answers are as follows:
B
C
D
A
Molar mass Li2CO3 = 73.89 g/mol
Molar mass Li = 6.94g/mol Li = 6.94*2 = 13.88g
% LI = 13.88/73.89*100 = 18.78% perfectly correct.
Explanation:
I'm pretty sure 1. yes 2. no and 3. it might be yes but I'd just put a maybe
