Carbon-12 represents one mole (written 1 mol) of Carbon-12. It contains 6.022 x 10 6 • By volume (for aqueous solutions) [(mass of substance (g) / volume of sample) x 10 23 molecules). 34 Download free eBooks at bookboon.com Fundamentals of Chemistry Thermochemistry 1 0.1 2.6 Enthalpy of Combustion, • Enthalpy of Combustion AH c °.