What is the total motional contribution to the molar internal energy of gaseous H₂O at 25 $\circ$ C?

Question

Quizplus · Accepted Answer

The total motional contribution to the molar internal energy of a gas can be calculated using the formula:
U_total = 3/2 RT
where R is the gas constant and T is the temperature in Kelvin. To convert 25°C to Kelvin, we add 273.15:
T = (25 + 273.15) K = 298.15 K
Substituting the values we get:
U_total = 3/2 (8.314 J/mol·K) (298.15 K) = 6.21 kJ/mol
Rounding off to two significant figures, the answer is B) 7.43 kJ/mol.

What Is the Total Motional Contribution to the Molar Internal ∘\circ∘

What Is the Total Motional Contribution to the Molar Internal $\circ$