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[" 3.?.For the reaction "],[qquad A(g)+2...

[" 3.?.For the reaction "],[qquad A(g)+2B(g)longrightarrow2C(g)+3D(g)],[" the change of enthalpy at "27^(@)C" is "19" kcal.The value of "Delta],[[" (a) "21.2kcal," (b) "17.8kcal],[" (c) "18.4kcal," (d) "20.6kcal]]

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