Question

1. what are the conditions used to determine the standard state of an element?

a. 100 degrees c
b. 0 degrees c
c. 25 degrees c

Explanation:

The standard state of an element (and substances in general for thermodynamic standard conditions) is defined at a temperature of 25 °C (or 298.15 K) and a pressure of 1 bar (or 1 atm, historically). Among the options, 25 degrees C is the temperature associated with standard state conditions for elements in thermodynamics (for defining standard enthalpy, entropy, etc.). 0 °C is the freezing point of water, and 100 °C is the boiling point of water at 1 atm, neither of which is the standard state temperature for elements.

Answer:

c. 25 degrees C