Question

1a) Heat transfer is not a state function and as such it is path dependent. Consider the solid "S" which undergoes sublimation by the process S(s) →S(g). This process may proceed in two ways. In one case, S sublimes in a container open to atmospheric pressure (constant pressure). In the other case it sublimes in a stoppered flask (constant volume). Which situation will result in the greater energy transfer in the form of heat? Please explain your answer.

1b) Calculate the total heat flow required to melt an 18.0g ice cube initially at -5.00 °C and raise the temperature to 75.00 °C at 1atm constant pressure. Use attached image as reference. Show all work.

Enthalpy of Phase Transition (kJ mol^-1) AH(fus) = 6.01 AH(vap) = 40.6 H2O(s) H2O(1) H2O(g) Specific Heat (J g^-1 K^-1) 2.09 4.18 2.03

Answer 1

1@ In the 1st cable the energy transfer will be greater than that of the and case, 9 5(5) 569) AN= 1 ist.case it's a constant pressure process and the heat transfer qp = 4H and case is a constant volume process and the heat transfer q=AE Now, H = 4E + ARRT. as, anyo, <H) 4E (R & Töre always et vel © H2O(s) _qui H2O(s)_93 > H2061) - 3_> H2O(l) esc Heat required for 1st process Co) = mass of ice x specificheat of ice x. 1. temperature change - 18X2.09x40-65)} J. Heat required for and process (fusion of 18) = 60kJ Alfus) = 6:01 That Heat required for 3rd process = mass of water * Specific heat of Howe) = 1844.18 (75-0) J = 5643 J 1 Total heat required for the entire process =(9, +2 +23) =(188.147 6 0 10+5643) J oc - 18X2 8) = 6010J x. temp. change =11841'J 11.84 KJ :