Question

Which of the following statements about enthalpy is false?A. At constant pressure, the enthalpy change is equal to the heat absorbed or released.B. Enthalpy is an extensive property.C. Enthalpy is a state function.D. The change in enthalpy of a process cannot be negative. E The SI unit of enthalpsy is J

Answer 1

A. At constant pressure, the enthalpy change is equal to the heat absorbed or released. --> True, since Q = dH = m*C*(Tf-Ti) at constant pressure only

B. Enthalpy is an extensive property. --> True, since it depends on total mass, dH = m*C*(Tf-Ti)

C. Enthalpy is a state function. --> true, since it won't depend on path

D. The change in enthalpy of a process cannot be negative. --> False, it can be, specially for exothermic processes

E The SI unit of enthalpsy is J --> True, since it is unit of energy