Oxygen is compressed in the sealed end of a long J-tube by means of a column of mercury open to the atmosphere as shown below Mercury has a density of 13.6x10^3 kgm^-3 and atmospheric pressure is 1.01 x 10^5 pa

Consider two closed systems a and b. system a contains 3000 kj of thermal energy at 20°c, whereas system b contains 200 kj of thermal energy at 50°c. now the systems are brought into contact with each other. will the heat transfer occur from system a to system b?