I would say the answer is A.
Atomic mass Cu = 63.546 a.m.u
63.546 g ---------------- 6.02x10²³ atoms
22 g --------------------- ??
22 x (6.02x10²³ ) / 63.546 => 2.08x10²³ atoms
hope this helps!
pretty sure its B thank me later
Answer:
(we use hess's law) it is so simple but the second reaction is not correct please right it