7、的倍,D错误.答案:D6.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(g),CO(g)+H2O(g)CO2(g)+H2(g)当反应达平衡时,测得c(H2)=1.9mol/L,c(CO)=0.1mol/L,则CO2的浓度为( )A.0.1mol/L B.0.9mol/LC.1.8mol/LD.1.9mol/L解析:设CO2的浓度为xCO(g)+H2O(g)CO2(g)+H2(g) x x xC(s)+H2O(g)CO(g) + H2(g) 1.9mol/L-x