CHEM 103 module 3 exam with answers spring 2023

Question 1 Not yet graded / 10 pts Click this link to access the Periodic Table. This may be helpful throughout the exam. A reaction between HCl and NaOH is being studied in a styrofoam coffee cup with a lid and the heat given off is measured by means of a thermometer immersed in the reaction mixture. Enter the correct thermochemistry term to describe the item listed. 1. The type of thermochemical process 2. The calorimeter and mixture of HCl + NaOH Your Answer: 1. The type of thermochemical process is an acid base reaction or neutralization reaction where heat is given off called a exothermic reaction. 2. The calorimeter and mixture of HCl + NaOH would be described as enthalpy or the total energy of the system. 1. Heat given off = Exothermic process 2. With lid = closed system Question 2 Not yet graded / 10 pts Click this link to access the Periodic Table. This may be helpful throughout the exam. 1. Show the calculation of the final temperature of the mixture when a 31.6 gram sample of water at 92.3oC is added to a 40.5 gram sample of water at 25.1oC in a coffee cup calorimeter. c (water) = 4.184 J/g oC 2. Show the calculation of the energy involved in melting 85 grams of ice at 0oC if the Heat of Fusion for water is 0.334 kJ/g. Your Answer: This study source was downloaded by from CourseH on :46:24 GMT -05:00 1. - (mwarm H2o x Cwarm H2O x ∆twarm H2O) = (mcool H2O x ccool H2O x ∆tcool H2O) - [31.6 g x 4.184 J/g°C x (Tmix - 92.3°C)] = [40.5g x 4.184 J/g°C x (Tmix - 25.1°C)] - [132.2144 J/°C x (Tmix - 92.3°C)] = [169.452 J/°C x (Tmix - 25.1°C)] -132.2144Tmix + 12,203.3891 = 169.452Tmix - 4,253.2452 16,456.6343 = 301.6664Tmix Tmix = 54.55°C 2. qI↔s= m x ∆Hfusion qI↔s= 85 g x 0.334 kJ/g qI↔s= 28.39 kJ and because heat is added + 28.39 kJ 1. - (mwarn H2O x c