To determine the properties of NH3 (ammonia) based on the solubility curve and the options provided, we need to consider the solubility characteristics of ammonia in water.
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State of Matter: Ammonia (NH3) is a gas at room temperature.
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Process Type: When discussing solubility, the enthalpy change associated with the dissolution process is important. If the dissolution is classified as endothermic, it means that heat is absorbed; if it is exothermic, heat is released. Typically, solutions of gases in liquids often involve endothermic processes for gases like ammonia, meaning that more heat is absorbed as the gas dissolves.
Based on this information, the best response from the provided options would be:
- A gas and an endothermic process.
This reflects that NH3 is a gas and that its dissolution in water is endothermic.