When crystalline solid barium hydroxide octahydrate and crystalline solid ammonium nitrate are mixed in a beaker at room temperature, a spontaneous reaction occurs. The temperature of the beaker contents rapidly falls to below 0°C. Use this information to decide whether the reaction is exothermic or endothermic and what the signs of ΔH and ΔS are. A) endothermic; ΔH > 0; Δ S > 0 B) exothermic; ΔH 0 C) endothermic; ΔH < 0; Δ S <0 D) endothermic; ΔH 0 E) exothermic; ΔH> 0; Δ S < 0

Question

Max

Chemistry

8 January, 12:45

When crystalline solid barium hydroxide octahydrate and crystalline solid ammonium nitrate are mixed in a beaker at room temperature, a spontaneous reaction occurs. The temperature of the beaker contents rapidly falls to below 0°C. Use this information to decide whether the reaction is exothermic or endothermic and what the signs of ΔH and ΔS are. A) endothermic; ΔH > 0; Δ S > 0 B) exothermic; ΔH 0 C) endothermic; ΔH < 0; Δ S <0 D) endothermic; ΔH 0 E) exothermic; ΔH> 0; Δ S < 0

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Answers (1)

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Tess Prince · Answer 1

A) endothermic; ΔH > 0; Δ S > 0

Explanation:

Since temperature falls = > system absorbs heat

=> reaction is endothermic

Since reaction is endothermic = > Delta H is positive (+)

Since reaction is spontaneous, Delta G = Delta H - T x Delta S is negative

Since Delta G is negative, Delta H is positive and T is positive

=> Delta S is positive (+)