With reference to enthalpy changes, the term standard conditions means ________. (a)P = 1 atm
(b)some common temperature, usually 298 K
(c)V = 1 L
A)a only
B)b only
C)c only
D)a and c
E)a and b

Question

Quizplus · Accepted Answer

Standard conditions refer to a set of reference conditions for enthalpy changes. These conditions are defined as: 
(a) Pressure of 1 atmosphere (atm)
(b) Temperature of 298 Kelvin (K)
Therefore, the correct option is (E) because it includes both (a) and (b). Option (c), which refers to a volume of 1 liter, is not part of the general definition of standard conditions.

With Reference to Enthalpy Changes, the Term Standard Conditions Means