國中教甄｜理化理化109 年第 54 題單選題

The following reaction achieves equilibrium at 400K: $4 H_{2 (g)} + 2 N O_{(g)} \to 2 H_{2} O_{(g)} + N_{2 (g)}$ At constant temperature, increasing the volume of the reaction vessel will

Aincrease the reaction rate.

Bcondense water vapor into liquid.

Cproduce more hydrogen gas.正確答案

Dproduce less nitrogen monoxide

答案與詳解

正確答案

恆溫下增加體積會使系統壓力降低，根據勒沙特列原理，平衡會向氣體莫耳數較多的一方（向左）移動，從而產生更多的氫氣。

Aincrease the reaction rate.✕ 錯誤

增大體積會導致所有氣體濃度降低，反應物濃度下降會使正逆反應速率皆降低，而非增加。

Bcondense water vapor into liquid.✕ 錯誤

增大體積使系統總壓下降，氣體更不易凝結；且400K遠高於水在常壓下的沸點，水蒸氣不會凝結為液態。

Cproduce more hydrogen gas.✓ 正確

Dproduce less nitrogen monoxide✕ 錯誤

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精選詳解

The following reaction achieves equilibrium at 400K: 4H2(g)​+2NO(g)​→2H2​O(g)​+N2(g)​ At constant temperature, increasing the volume of the reaction vessel will