How many grams of NaCl can be produced from 4.2 moles of Cl2?

When balancing a chemical equation:

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.

Which type of intermolecular attractions holds ammonia molecules together with other ammonia molecules?