题目

把足量的CO2通过0.2 mol Na218O2，当完全反应后，碳酸钠的质量是 A.21.2 g                                    B.22.4 g C.在21.2 g～22.4 g之间                 D.无法计算 答案：CI call ________ Mr Smith at his office.A.forB.inC.uponD.at