Calculate ΔH for the reaction C2H4 (g) + H2 (g) → C2H6 (g), from the following data: C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (l) ΔH = -1411. kJ
C2H6 (g) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (l) ΔH = -1560. kJ
H2 (g) + 1/2 O2 (g) → H2O (l) ΔH = -285.8 kJ

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radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.