Chemistry worksheet showing heats of formation calculations for various chemical reactions.
A chemistry worksheet titled "Heats of Formation" displaying a table of standard enthalpies of formation and five chemical reactions with calculated enthalpy changes. The reactions involve compounds like NaOH, HCl, CO, CO₂, CH₄, H₂S, O₂, H₂O, and NO₂, with corresponding ΔHf values in kJ/mol.