Calculate the enthalpy change for the reaction CaCO3(g)→CaO(s)+CO2(g), from the following equations:
2Ca(s)+O2(g)→2CaO(s) ΔH=−1270kJ
2Ca(s)+2C(s)+3O2(g)→2CaCO3(s) ΔH=−2414kJ
C(s)+O2(g)→CO2(g) ΔH=−394kJ

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Many pharmaceutical drugs are organic compounds that were originally synthesized in the laboratory. which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology

Phosgene (carbonyl chloride), cocl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures: co(g) cl2(g)⇌cocl2(g) carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 477 ∘c . at equilibrium, the concentrations were measured and the following results obtained: gas partial pressure (atm) co 0.830 cl2 1.30 cocl2 0.220 what is the equilibrium constant, kp, of this reaction