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 pure liquid is in its standard state at 25C and a vapor pressure of 1.00 atm.
D. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25C.
E. All of these are true.
I thought that the answer would be b.

Look at answer C as a possible culprit. Look it up to see what the standard state for a liquid. See if having a vapor pressure of 1 atm is part of the definiton.

fa/lskf

To find the answer to this question, we need to understand what the thermodynamic standard state is for each substance. The thermodynamic standard state refers to the most stable and commonly used form of a substance at a specified temperature and pressure.

Let's go through the options one by one:

A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25°C. This statement is true. When a gas is in its standard state, it is generally at a pressure of 1.00 atm and a temperature of 25°C.

B. An aqueous solution is in its standard state at a concentration of 1.00 M. This statement is not true. The standard state for an aqueous solution is typically defined as a concentration of 1.00 M, not necessarily every aqueous solution.

C. A pure liquid is in its standard state at 25°C and a vapor pressure of 1.00 atm. This statement is true. The standard state for a pure liquid is often defined as a temperature of 25°C and a vapor pressure of 1.00 atm.

D. A solid is in its standard state when the atmospheric pressure is 1.00 atm and the temperature is 25°C. This statement is true. The standard state for a solid is usually defined as a temperature of 25°C and a pressure of 1.00 atm.

E. All of these are true. This statement is not true because option B is not true.

Therefore, the correct answer is B. An aqueous solution is not in its standard state at a concentration of 1.00 M.