Chemistry problems in grade three

Three substances: magnesium sulfate, magnesium sulfate and sodium bisulfate; ; Because the relative atomic mass difference between Na and Mg is 1, NaHSO4 can be regarded as MgSO4, so three substances become: MgSO4, MgSO3, mgso4; Their atomic ratio: Mg:S are all equal to1:1; So the mass ratio of Mg:S = 24: 32 = 3: 4; And S%=32%, so mg% = 3 * 32%/4 = 24%；%; So O%= 1-32%-24%=44%.

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Requirements of Zhengzhou University Self-taught Undergraduate Course

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