Question

During the action of a sodium-potassium pump, 50 ATP molecules were spent. Predict how many sodium ions are transported across the cell membrane.
a. 50
b. 100
c. 150
d. 200

Answer 1

1 ATP molecule allows 3 Na+ to move out of the cell
and 2 K+ to enter.
 So 50 ATP molecules allow 150 Sodium ions to move out and it allows 100 Potassium ions to move in
so  correct option is C 
hope it helps