What is the empirical formula of a compound that contains 49.4 % K, 20.3 % S, and 30.3 % O by mass?
A、K2SO4
B、KSO3
C、KSO4
D、K2SO3
E、KSO2
发布时间：2025-05-31 17:40:06
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答案：K2SO3
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