When a gas is taken from a to c along the curved path in Figure 3, the work done on the gas is 35 J and the heat removed from the gas is 63 J. Along path abc, the work done on the gas is 48 J. (a) Calculate the thermal energy exchanged between the gas and surroundings for path abc. Is the heat removed from the gas or added to the gas? Justify your answer. [7 marks] (b) If Pb - — 2Pc, calculate the work done on the gas for the path cda. [3 marks] b a c d o Figure 3​