if a glass of ice water is at equilibrium, what is its temperature?
The same as the environmental temperature of its surroundings..
could it be at STP?
To determine the temperature of a glass of ice water at equilibrium, we need to understand the concept of equilibrium and the properties of water.
When we say the glass of ice water is at equilibrium, it means that the ice cubes have completely melted, and the system has reached a stable state where no further changes are occurring. At equilibrium, the rate of ice melting is equal to the rate of water freezing, resulting in no net change in the amount of ice or liquid water.
The temperature at which ice and water can coexist in equilibrium is known as the "melting point" or "freezing point" of water. This temperature is typically 0 degrees Celsius or 32 degrees Fahrenheit at standard atmospheric pressure.
So, if the glass of ice water is at equilibrium, its temperature will be very close to the melting point of water, around 0 degrees Celsius or 32 degrees Fahrenheit.