• # question_answer If $\Delta Q$ and $\Delta W$ represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as A) $\Delta Q=\Delta U+\Delta W$ B) $\Delta Q=\Delta U-\Delta W$ C) $\Delta Q=\Delta W-\Delta U$ D) $\Delta Q=-\Delta W-\Delta U$

 [b] From FLOT$\Delta Q=\Delta U+\Delta W$ Q Heat supplied to the system so DQ ® Positive and work is done on the system so DW ® Negative Hence +DQ  = DU  DW