Answer Happy

Given the standard enthalpy changes for the following two reactions: (1) 2Ni(s) + O₂(g) → 2NiO(s) AH° = - 479.4 kJ (2) Ni(s) + Cl₂(g) → NiCl₂ (s) AHⓇ = -305.3 kJ what is the standard enthalpy change for the reaction: (3) 2NiCl2 (s) + O2(g) → 2NiO(s) + 2Cl2(g) AH° = ? AHⓇ kJ
Given the standard enthalpy changes for the following two reactions: (1) 2C(s) + H₂(g) → C₂H₂(g) AH = 226.7 kJ (2) 2C(s) + 2H₂(g) → C₂H4 (9) ΔΗ° = 52.3 kJ What is the standard enthalpy change for the following reaction? (3) C₂H₂(g) + H₂(g) → C₂H4 (9) AH° = ? Standard enthalpy change = kJ