20. The enthalpy change under standard conditions for which of the reactions below would be equal to the $$ \Delta H_{\mathrm{f}}^{\circ} $$ of $$ \mathrm{NaOH}(s) $$ ? (A) $$ \mathrm{Na}(s)+\mathrm{H}_{2} \mathrm{O}(l) \rightarrow \mathrm{NaOH}(s)+1 / 2 \mathrm{H}_{2}(g) $$ (B) $$ \mathrm{Na}(s)+1 / 2 \mathrm{O}_{2}(g)+1 / 2 \mathrm{H}_{2}(g) \rightarrow \mathrm{NaOH}(s) $$ (C) $$ \mathrm{Na}(s)+1 / 2 \mathrm{H}_{2} \mathrm{O}_{2}(l) \rightarrow \mathrm{NaOH}(s) $$ (D) $$ \mathrm{Na}^{+}(a q)+\mathrm{OH}^{-}(a q) \rightarrow \mathrm{NaOH}(s) $$

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标准生成焓（$$ \Delta H_{\mathrm{f}}^{\circ} $$）定义为在标准条件下，从各元素的标准态生成1摩尔化合物所伴随的焓变。

对于氢氧化钠（$$ \mathrm{NaOH}(s) $$），其标准生成焓反应应为：
$$ \mathrm{Na}(s) + \frac{1}{2} \mathrm{O}_{2}(g) + \frac{1}{2} \mathrm{H}_{2}(g) \rightarrow \mathrm{NaOH}(s) $$

查看选项，选项 **(B)** 符合上述反应，所以答案是：

**答案：选项 B**
答案：选项 B

The enthalpy change under standard conditions for which
of the reactions below would be equal to the of
?
(A)
(B)
©
(D)

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The enthalpy change under standard conditions for which of the reactions below would be equal to the of ? (A) (B) © (D)