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(8分)[Ⅰ] 将气体A、B置于固定容积为2L的密闭容器中,发生如下反应: 3A(g) +B(g) 2C(g)+2D(g), 反应进行到10s末,达到平衡,测得A的物质的量为1.8mol,B的物质的量为0.6mol,C的物质的量为0.8mol,则: (1)用C表示10s 内正反应的化学反应速率为 ; (2)反应前A的物质的量浓度是 ; (3)平衡后,生成物D的浓度为 ; [Ⅱ] 某温度下,在一个体积为2L的固定不变的密闭容器中充入0.3mol SO 2 和0.2mol O 2 ,发生2 SO 2 + O 2 2 SO 3 反应。几分钟后反应达到化学平衡状态,测得容器中气体压强变为原来的90% ,则该反应达到平衡时SO 2 的转化率为______________。
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