某不纯的烧碱样品，含Na2CO3 3.8%（质量百分含量）、H2O 5.8%、NaHCO3 0.004%。取m g样品溶于40 m L 2 mol/L的盐酸后，并用2 mol/L Na OH溶液中和剩余的酸，在蒸发后可得干燥的固体的质量为
| A．4.68 g | B．5.58 g | C．2.34 g | D．3.34 g |
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 |
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| A．someone | B．anyone | C．not one | D．no one |
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| A．said | B．to say | C．saying | D．being said |
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| A．can | B．must | C．will | D．may |
—— ______ , as a matter of fact
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