The constant pressure molar heat capacity of ammonia, NH₃, has been found to vary with temperature according to the relation
C_p.m / J K^-1 mol^-1=a+bT+c/T²
With a = 29.73, b = 25.1 * 10^-3 K^-1 and c = -1.55* 10⁵ K². Calculate the value of the constant pressure molar heat capacity at 25.0 °C.

Question

Quizplus · Accepted Answer

To calculate the constant pressure molar heat capacity at 25.0 °C (which is 298.15 K), we substitute T = 298.15 K into the given equation: $C_{p,m} = a + bT + \frac{c}{T^2}$. Using the given values for a, b, and c, we get $C_{p,m} = 29.73 + (25.1 \times 10^{-3} \times 298.15) - \frac{1.55 \times 10^{5}}{(298.15)^2}$. Calculating this gives a value close to 35.47 J K^-1 mol^-1.

The Constant Pressure Molar Heat Capacity of Ammonia, NH3, Has

The Constant Pressure Molar Heat Capacity of Ammonia, NH₃, Has