Write an equation that expresses the law of thermodynamics in terms of heat and work

The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems.The first law is often formulated by stating that the change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings.Equivalently, perpetual motion machines of the first kind are impossible.

Answer heart of american                  live in harmony                    hillsides of orchards                    blaze of color                    backdrop of pines;

The question is incomplete. complete question is attached belowanswer: correct answer is option b  i.e.  solid particles  reason: filter paper has small pores, through which smaller particles can pass through. however, solid particles  have relatively larger size. hence, they are least likely to pass through.