将14 g铁粉投入到500 mL某稀硝酸中，经充分反应后，测得Fe和HNO3均无剩余。已知反应放出的气体在标准状况下为4．48 L。假定反应前后溶液的体积不变且还原产物只有一种，则原硝酸的物质的量浓度是 ( )
| A．0．8 mol·L-1 | B．1．6 mol·L-1 |
| C．1．4 mol·L-1 | D．0．75 mol·L-1 |
相关试题
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— ______ , as a matter of fact
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