A substance W has a concentration of 0.02mol when its molar mass was found to be74.0gmol-1 .Another valenve V contains 1.00×10^23 atom and has molar mass of 40.g mol^-1. which of the two substance has greater mass +in grams) ? [l= 6.02×10^23]

ii) A 250Cm^3solution contains 14.65g of sodium chloride(Nacl) . calculate concentration of the solution in mol dm^3. [Na2=23 ,cl = 35.5].

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.