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原题:38.4毫克Cu跟适量的浓HNO_9反应,铜全部作用后,共收得气体22.4毫升(标准状况),反应消耗的HNO_3的物质的量可能是( )。
The original title: 38.4 mg of Cu reacted with a suitable amount of concentrated HNO 9 , and after the copper had been fully used, a total of 22.4 ml of gas was collected (standard condition). The amount of HNO 3 that was consumed by the reaction may be ().