70.5g x 1 mol / 58.5g = 1.2mol of nacl
Keeping your arm straight in front of you, you rotate 90° to your left, and see the left side of the circle lit while the right side is dark. Half the ball is still lit up, but you can see only part of the lit area. As you continue to rotate, you see a different amount of the ball.
oops pls forgive me I accidentally did the wrong question.
