Calculate the value of for the reactions, N _2( g ) + 3 H _2( g ) 2 NH _3( g ) at 25°C

CHEMISTRY · Subjective · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

Calculate the value of

\log K_P

for the reactions,

\text{N}_2(\text{g}) + 3\text{H}_2(\text{g}) \rightleftharpoons 2\text{NH}_3(\text{g})

at 25°C. The standard enthalpy of formation of

\text{NH}_3(\text{g})

-46

kJ and standard entropies of

\text{N}_2(\text{g})

\text{H}_2(\text{g})

and

\text{NH}_3(\text{g})

are 191, 130 and 192

\text{JK}^{-1}\text{mol}^{-1}

respectively. (

R = 8.3 \text{ JK}^{-1}\text{mol}^{-1}

)