In reaction , -LSB- math -RSB- N_2 O_4 \ to -LCB- 2NO_2 -RCB- _ -LCB- -LRB- g -RRB- -RCB- -LSB- / math -RSB- , what will be the value of -LSB- math -RSB- K_C -LSB- / math -RSB- at 35 ° C if -LSB- math -RSB- N_2 O_4 -LSB- / math -RSB- is dissociated to the extent of 20 % under a pressure of 1 atmosphere ?
Which is regarded as a more difficult A level in the UK , Further Maths or Chemistry ?