问题
单项选择题
用甲醛法测定工业铵盐中的NH3(其摩尔质量为17 g/mol)含量，0.2g铵盐消耗25mL 0.1mol/L的NaOH溶液，则试样中NH3的含量约为( )。
A．21%
B．26%
C．31%
D．36%
答案
参考答案：A
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用甲醛法测定工业铵盐中的NH3(其摩尔质量为17 g/mol)含量，0.2g铵盐消耗25mL 0.1mol/L的NaOH溶液，则试样中NH3的含量约为( )。
A．21%
B．26%
C．31%
D．36%
参考答案：A
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