为了让同学们进一步了解宁波，激发大家对宁波的热爱之情，育才中学准备开展“美丽宁波”系列活动，请你帮助策划并完成以下任务。
A
A bus comes to the bus stop．An old man gets on it．There's no seat for him．"The boy will give his seat to you．"the bus driver says to the old man．But the boy in the seat doesn't stand up．The bus driver looks at the boy,then he says to the old man again in a high voice(声音)，"The boy will be happy to give you his seat．"This time the boy hears it．His face turns red．He gets up at once．The old man sits down and says to the boy,"Thank you,my boy．"
，则集合
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CO2(g)＋H2(g)，反应达到平衡后，测得CO2的物质的量为0.6 mol。然后再充入4 mol H2O(g)，达到新的平衡后，CO2的物质的量为( )
