Answer:
The percentage yield is= 80%
Explanation:
% yield= actual yield/theoretical yield ×100
From The question
Actual yield= 240mg
Theoretical yield= 300mg
%yield= 240/300×100= 80%
Ok so this all boils down to Newton's second law
Force = mass X acceleration
so the force = 10 X 3 = 30N
Mg- is the isoelectronic of Na