Question #162694

Automobiles and trucks pollute the air with NO. At 2000.0°C, Kc for the reaction N2(g)+O2(g)⇌2NO(g) At 2000.0°C Kc = 4.100 × 10–4 and ΔH° = 180.6 kJ. What is the value of Kc at 31.00°C?


1
Expert's answer
2021-02-11T04:49:21-0500

Use Van't Hoff equation

lnK2K1=ΔHR(1T21T1)ln\frac{K_2}{K_1}=\frac{-\Delta H}{R}(\frac{1}{T_2}-\frac{1}{T_1})


T1(K)=2000.0+273=2273KT_1(K)= 2000.0 + 273= 2273 K

T2(K)=31.00+273=304.KT_2(K) = 31.00+273=304.K

ΔH=180.6kJ=180600J\Delta H = 180.6 kJ = 180600J

K1=4.100×104K_1 = 4.100\times10^{-4}

K2?K_2 - ?


lnK24.100×104=1806008.314(130412273)ln\frac{K_2}{4.100\times 10^{-4}}= \frac {-180600}{8.314}(\frac{1}{304}-\frac{1}{2273})


K2=1.886×1026K_2 = 1.886\times10^{-26}

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