Would the law of conservation energy make sense if scientist did not reconised the concept of potential energy

The law of conservation of energy would not make sense if scientist did not recognize the concept of potential energy. When you conserve potential energy, you are expending kinetic energy and vice versa. The law of conservation of energy is the total energy of an isolated system remains constant. 

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

b. examine and describe cells