at standard pressure, which has the highest average kinetic energy?

a)H20(g) at 110 oC
b)H20(s) at -10 oC
c)H20(l) at 25 oC
d)H20(l)(arrows going opposite directions)H20(g) at 70 oC
e)H20(s)( arrows going opposite direction)H20(l) at 0 oC

To determine which substance has the highest average kinetic energy at standard pressure, we need to consider the temperature and the state of the substance.

The average kinetic energy of a substance is directly proportional to its temperature. Therefore, the substance with the highest temperature will have the highest average kinetic energy.

Let's analyze each option:

a) H2O(g) at 110 oC: This indicates that water is in the gaseous phase at a temperature of 110 oC. Since the temperature is higher than other options, the average kinetic energy of H2O(g) is expected to be higher.

b) H2O(s) at -10 oC: This suggests that water is in the solid phase at a temperature of -10 oC. The temperature is lower than in option a), so the average kinetic energy of H2O(s) is expected to be lower.

c) H2O(l) at 25 oC: This indicates that water is in the liquid phase at a temperature of 25 oC. The temperature is lower than in option a), so the average kinetic energy of H2O(l) is expected to be lower.

d) H2O(l) ⇄ H2O(g) at 70 oC: This represents water in a phase equilibrium between liquid and gas at a temperature of 70 oC. Although this system contains both liquid and gaseous phases, the average kinetic energy is generally higher in the gaseous phase. Therefore, the overall average kinetic energy is expected to be higher than in option c) but potentially lower than in option a).

e) H2O(s) ⇄ H2O(l) at 0 oC: This indicates water in a phase equilibrium between solid and liquid at a temperature of 0 oC. Similar to option d), the average kinetic energy of the liquid phase is generally expected to be higher than the solid phase. Therefore, the overall average kinetic energy is expected to be higher than in option b) but potentially lower than in option a).

Considering the analysis above, we can conclude that option a) H2O(g) at 110 oC is expected to have the highest average kinetic energy at standard pressure.

To determine which substance has the highest average kinetic energy at standard pressure, we need to compare the kinetic energy of the different states of water (H2O) at different temperatures.

Kinetic energy is directly proportional to temperature, so the substance with the highest temperature will have the highest average kinetic energy.

Let's analyze each option:

a) H2O(g) at 110°C: This is water vapor at a high temperature. Gas molecules have higher kinetic energy compared to liquids or solids. Therefore, this option has a high average kinetic energy.

b) H2O(s) at -10°C: This is water in its solid state (ice) at a low temperature. Solids have lower kinetic energy compared to gases. This option has a lower average kinetic energy.

c) H2O(l) at 25°C: This is water in its liquid state at room temperature. Liquids generally have intermediate kinetic energy compared to gases and solids.

d) H2O(l) ⇌ H2O(g) at 70°C: This indicates a dynamic equilibrium between liquid and gas phases. At 70°C, both liquid and gas can coexist. The kinetic energy of both phases will depend on their respective temperature.

e) H2O(s) ⇌ H2O(l) at 0°C: This indicates a dynamic equilibrium between solid and liquid phases. At 0°C, both ice and liquid water can coexist. The kinetic energy of both phases will depend on their respective temperature.

Based on the comparison, option (a) H2O(g) at 110°C has the highest average kinetic energy because gases generally have higher kinetic energy compared to liquids or solids.