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

Phosphorous acid, h3po3(aq) , is a diprotic oxyacid that is an important compound in industry and agriculture. p k a1 p k a2 1.30 6.70 calculate the ph for each of the points in the titration of 50.0 ml of 1.5 m h3po3(aq) 1.5 m h 3 po 3 ( aq ) with 1.5 m koh(aq). 1.5 m koh ( aq ) .