Calculate the standard enthalpy of formation of Acetylene (C2H2) from its elements: 2C(graphite) + H2(g) -------- C2H2(g) Use the following equations to calculate ?H°rxn 1) C(graphite) + O2(g) -------- CO2(g) ?H° = -393.5 kJ 2) H2(g) + 1/2O2(g) -------- H2O(l) ?H° = -258.8 kJ 3) 2 C2H2(g) + 5O2 -------- 4CO2(g)+ 2H2O(l) ?H° = -2598.8 kJ Please explain this question in detail to me because i am really lost Please do not answer if you are just going to answer the question if you are going to post a retarded answer on how i should learn thing ...because i am trying to learn how to do this and i have been trying to work it out all night. And my teacher made this an open class question not a homework question but i need to learn this for a test.