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Tungsten trioxide (WO3) is a dense yellow powder that, because

Berikut ini adalah pertanyaan dari andhika3548saputra pada mata pelajaran Kimia untuk jenjang Sekolah Menengah Atas

Tungsten trioxide (WO3) is a dense yellow powder that, because of its bright color, is used as a pigment in oil paints and watercolors (although cadmium yellow is more commonly used in artists' paints). Tungsten metal can be isolated by the reaction of WO; with H2 at 1100°C according to the equation WO3(s) + 3H2(g) → W(s) + 3H2O(g). What is the lowest temperature at which the reaction occurs spontaneously? AH° = 27.4 kJ/mol and AS° = 29.8 J/K.​

Jawaban dan Penjelasan

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Jawaban:

Penjelasan:

To determine the lowest temperature at which the reaction occurs spontaneously, we need to calculate the standard Gibbs free energy (ΔG°) of the reaction at that temperature. According to the equation ΔG° = ΔH° - TΔS°, the value of ΔG° will be negative if the reaction is spontaneous.

Plugging in the given values, we find that ΔG° = 27.4 kJ/mol - T(29.8 J/K). For the reaction to be spontaneous, ΔG° must be negative, which means that T must be greater than 27.4 kJ/mol / 29.8 J/K, or about 919 K. This corresponds to about 646°C, which is the lowest temperature at which the reaction occurs spontaneously.

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Last Update: Tue, 14 Mar 23
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