Which of the following is NOT true about the thermodynamic standard state?

A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C .
B. An aqueous solution is in its standard state at a concentration of 1.00 M.
C. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C .
D. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm.
E. All of these are true.

Look up standard states and check statement D. I don't believe the vapor pressure MUST be 1.00 atm.

C is true, apparently, contrary to what i was told...

anyways, do not choose c as your answer.

To determine which statement is NOT true about the thermodynamic standard state, let's analyze each option:

A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C.
B. An aqueous solution is in its standard state at a concentration of 1.00 M.
C. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C.
D. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm.

To find the NOT true statement, we need to identify the option that does not describe the thermodynamic standard state accurately.

By definition, the thermodynamic standard state refers to the fixed conditions used to measure and compare properties. It represents a reference point for thermodynamic calculations.

Option A is correct because a gas is considered to be in its standard state when its pressure is 1.00 atm and its temperature is 25C.

Option B is also correct since an aqueous solution is in its standard state at a concentration of 1.00 M.

Option C is also accurate because a solid is considered to be in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C.

However, option D is NOT true. A pure liquid does not have a fixed vapor pressure of 1.00 atm at 25C. The vapor pressure of a liquid can vary depending on its composition and temperature. Therefore, option D is the correct answer.

In conclusion, the statement that is NOT true about the thermodynamic standard state is:

D. A pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm.