Question

A notice appeared on your front door – apparently your sidewalk is covered in ice and posing a hazard. Being poor college students, how much will it cost to melt the ice? • Your sidewalk is 1 m wide, 20 m long, and has (on average) a 6 mm thick ice coating. • The outside air temperature will not get above -15 °C any time soon. • Salt costs $1.60/kg. • Assume ice has a density of 0.92 g/cm

20 Path 1 NaCl Solution +0.1C 10 Path 2 Path 3 Solution 0) 0 Liquidus Line Eutectic Point -10 Ice NaCI.2H20 Concentrated Solution Solution 20 -21.1 °C 30 23.3 26.3 0 5 10 15 20 25 30 NaCl Concentration (% mass)

Answer 1