How many moles are in 2.35 grams of phosphorus?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

How many grams of n2h4 will be consumed by 23 g of n2o4

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.