Standard State/Phase Label HELP!?

Standard State and Phase Labels?


Lab questions:





Give formula of standard state reference form and include phase label.





a) Pb


b) C


c) N


d) Br





e) What is the value of Delta_H_f (heat of formation) for any element in standard state and why?





Thank you everyone =)

Standard State/Phase Label HELP!?
standard enthalpy change of formation for all elements at std state is 0 kJ mol^-1, as it already at the std state (no need for reaction)





Pb (s), C-graphie/diamond (s), N2 (g), Br2 (g)