QuestionApril 29, 2025

Select all the correct answers. Based on the enthalpy changes given for the reactions, which reactions are endothermic? 2H_(2)Oarrow 2H_(2)+O_(2),Delta H=484kJ C+O_(2)arrow CO_(2),Delta H=-394kJ H_(2)+Br_(2)arrow 2HBr,Delta H=-73kJ 2NH_(3)arrow N_(2)+3H_(2),Delta H=92kJ

Select all the correct answers. Based on the enthalpy changes given for the reactions, which reactions are endothermic? 2H_(2)Oarrow 2H_(2)+O_(2),Delta H=484kJ C+O_(2)arrow CO_(2),Delta H=-394kJ H_(2)+Br_(2)arrow 2HBr,Delta H=-73kJ 2NH_(3)arrow N_(2)+3H_(2),Delta H=92kJ
Select all the correct answers. Based on the enthalpy changes given for the reactions, which reactions are endothermic? 2H_(2)Oarrow 2H_(2)+O_(2),Delta H=484kJ C+O_(2)arrow CO_(2),Delta H=-394kJ H_(2)+Br_(2)arrow 2HBr,Delta H=-73kJ 2NH_(3)arrow N_(2)+3H_(2),Delta H=92kJ

Solution
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Answer

The endothermic reactions are: ### 2H_{2}O \rightarrow 2H_{2} + O_{2} and 2NH_{3} \rightarrow N_{2} + 3H_{2} Explanation 1. Identify endothermic reactions Endothermic reactions absorb heat, indicated by a positive \Delta H. Reactions with \Delta H > 0 are endothermic. 2. Analyze each reaction's \Delta H 2H_{2}O \rightarrow 2H_{2} + O_{2}, \Delta H = 484kJ: Positive \Delta H, endothermic. C + O_{2} \rightarrow CO_{2}, \Delta H = -394kJ: Negative \Delta H, exothermic. H_{2} + Br_{2} \rightarrow 2HBr, \Delta H = -73kJ: Negative \Delta H, exothermic. 2NH_{3} \rightarrow N_{2} + 3H_{2}, \Delta H = 92kJ: Positive \Delta H, endothermic.

Explanation

1. Identify endothermic reactions<br /> Endothermic reactions absorb heat, indicated by a positive $\Delta H$. Reactions with $\Delta H > 0$ are endothermic.<br /><br />2. Analyze each reaction's $\Delta H$<br /> $2H_{2}O \rightarrow 2H_{2} + O_{2}, \Delta H = 484kJ$: Positive $\Delta H$, endothermic.<br /> $C + O_{2} \rightarrow CO_{2}, \Delta H = -394kJ$: Negative $\Delta H$, exothermic.<br /> $H_{2} + Br_{2} \rightarrow 2HBr, \Delta H = -73kJ$: Negative $\Delta H$, exothermic.<br /> $2NH_{3} \rightarrow N_{2} + 3H_{2}, \Delta H = 92kJ$: Positive $\Delta H$, endothermic.
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