求一道英文化学题的翻译
The action of concentrated H2SO4 on urea, (H2N)2CO, results in the production of a white crystalline solid X of formula H3NO3S. This is a monobasic acid. On treatment with sodium nitrite and dilute hydrochloric acid at 273K, one mole of X liberates one mole of N2, and on addition of aqueous BaCl2, the resulting solution yields one mole of BaSO4 per mole of X taken initially. Deduce the structure of X.
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