Hydrogen sulfide, H2S, is a poisonous gas with the odor of rotten eggs. The reaction for the formation of H2S from the elements is

Use Hess€™s law to obtain the enthalpy change for this reaction from the following enthalpy changes:

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S(rhombic) H S(g) H,S(g) + O2(g)--H20(g) + SO2(g); ΔΗ =-518 kJ H2(g) + O2(g) _ -H20(g):AH-_242 kJ Sg(rhombic) + 02(g)--SO2(g); ΔΗ -297 kJ