摘要:21.某温度下.C和水在密闭容器中发生下列反应:C(s)+H2O(g) CO(g)+H2.CO(g)+H2O(g) CO2(g)+H2(g)当反应达平衡时.测得c(H2)=1.9mol/L.c(CO2)=0.9mol/L.则CO的浓度为( ) A.0.1mol/L B.0.9mol/L C.1.8mol/L D.1.9mol/L

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