i) A copper pipe of 3.5 m length of extends directly from a hot-water heater in a basement to a faucet on the first floor of a house. When the faucet isn't fixed in place, determine how much it will increase when the pipe is heated from 20.0° C to 85.9° C. The coefficient of linear expansion for copper is 1.6 x 10-5 K-1. Avoid any raise in the size of the faucet itself or of the water heater.
ii) Steel railroad tracks of length L = 18.20 m are laid at 10.0° C. Determine how much space must be left between the track sections when they are to just touch when the temperature is T = 49.5° C?
iii) Determine the mass (in kg) of one molecule of sodium chloride (NaCl).