3 C(s) + 4 H2(g) - (Q14) Find AHrxn (in kJ) for the formation of propane from its elements: C3H8 (g) Use the following reactions with known enthalpy changes (4 sf): (A) C3H8 (g) + 5 O2 () --> 3 CO2 + 4 H20 (g) AHex = -2043.0 kJ (B) C(s) + O2(g) --> CO2 (g) AHex = -393.5 kJ (C) 2 H2(g) + O2 (g) --> 2 H20 (g) AHpX = -483.6 kJ >