A tank of volume 1.2 m^3 initially contains steam at 8 MPa and 400°C. Steam is withdrawn slowly from the tank until the pressure drops to p. Heat transfer to the tank contents maintains the temperature constant at 400°C. Neglecting all kinetic and potential energy effects and assuming specific enthalpy of the exiting steam is linear with the mass in the tank. Required:
a. Determine the heat transfer, in kJ, if p = 2 MPa.
b. Plot the heat transfer, kJ, versus p ranging from 0.5 to 8 MPa.

wher is the rest of the question

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

it is b that is the answer.