翻译：含有2 mol H原子 的 (NH4)2HPO4 是多少 mol
1 个(NH4)2HPO4 有2*4+1 = 9 个 H
所以1 mol (NH4)2HPO4 含有 9 mol H
现在 含有2 mol H,所以 (NH4)2HPO4的物质的量 是 2/9 mol
how many mole of (NH4)2HPO4,contain 2 mol of hydrogen atoms.
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