Final answer:
In the mixture mentioned, there are two boundaries: one between the gas phase (CO2 and ammonia gas) and the liquid phase (methanol solution), and another between the liquid phase and the solid-liquid equilibrium of water at the triple point.
Step-by-step explanation:
The question asks about the number of boundaries in a mixture composed of 2 molecules CO2(g), H2O (at 0°C), ammonia gas, and methanol (aq). Boundaries are separations between different phases or stages of matter. In this mixture, CO2 and ammonia are in the gaseous state, H2O at 0°C is at the triple point where it can exist in equilibrium with its solid (ice) and gas (water vapor) phases, and methanol (aq) indicates a methanol solution in water, which is a liquid.
The boundaries that can be identified are between the gas phase (CO2 and ammonia gas together), the liquid phase (methanol solution), and the solid-liquid equilibrium of water. Thus, there are two boundaries: one between the gas phase and the liquid phase, and another between the liquid phase and the solid-liquid equilibrium of water.