Question

Chapter 5: Thermodynamic 1) From the specific heat capacity (Cs), answer the following question: Aluminum (Cs = 0.901 J/(g.°C)) Iron (Cs 0.449 J/(g.°C) Water (Cs 4.184 J/(g.°C) Ethanol (Cs 2.43 J/(g.°C) (a) Order the materials based on the time required to heat them from the slowest to the fastest? (b) Which material will cool down the fastest? (c) Which material will take a lot of heat to change it temperature? 2) If the temperature of 35.6 g of ethanol increase from 24.5 °C to 95.6 °C, how much heat has been absorbed by ethanol? (Specific heat of ethanol is 2.43 J/(g. C))

Answer 1

Material Heat capacity (es) 0.901 9/g.c Aluminium toon 0.449 J/g.c 4.184 J/goc Water Ethanol 2.435/9°c Heat capacity is defined by the heat required to . increase so i temperature of Igm sample. So, higher the heat capacity, higher eat is capacity, the higher heat supply to needed heat the material and thers time required is more. So, Order of the materials based on a on the time required to heat them from the slowest it to to fastest Water > Ethanol > Aluminium Iron (b) Higher the heat capacity: higher the power to keep heat in the material and slower the cooling So, the material will cool down fastest Iron (0) Material will take lot of heat to change its temperature is rater. (2) Mass of ethanol = 35.69 Initial temperature = 24.5°C Final 4 = 95.6" Temperature changes 71.1°C Required Heat = Mass ethathol x temperature & Heat capacity change :. 35.6 x 76.1* 243 -6150.72J