Calculate the standard enthalpy of combustion of a methane sample by using the standard enthalpies of formation.
Write the equation and balance it. CH4 + 2O2 --> CO2 + 2H2O Assign the enthalpies of formation and the sign of the energy value with the corresponding molecule (Will demonstrate my technique if needed). e.g. C(s) + 2H2(g) --> CH4(g) Delta H(f) = -74.87
Generate an equation will all assigned values and the single unknown Delta H(combustion/c). Rearrange for Delta H(c). Answer is - 890.63 KJ/mol.
AC
Related Chemistry A Level answers
All answers ▸Q1. Two beakers, A and B, each contain 100.0 cm^3 of 0.0125 mol/dm^3 nitric acid. Calculate the pH of the solution formed after 50.0 cm^3 of distilled water are added to beaker A. Give your answer to 2 decimal places.
Explain, in terms of atomic energy levels, how an atomic emission spectrum is formed
State the qualitative tests to distinguish between halide ions in solution.
Give the IUPAC name of CH3CH2CH2CH2CH(OH)CN and describe why the formation of this molecule creates 2 enantiomers.