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Enthalpy and Rate Constant
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Topic: Enthalpy and Rate Constant (Read 9287 times)
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TEA1
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Enthalpy and Rate Constant
«
on:
April 14, 2008, 09:02:47 PM »
I have 2 questions I need a little help on. Thanks
1. Consider the thermal decomposition of CaCO3.
CaCO3(s) CaO(s) + CO2(g)
The equilibrium vapor pressures of CO2 are 22.6 mmHg at 700°C and 1829 mmHg at 950°C. Calculate the standard enthalpy of the reaction.
2. The rate constant for the elementary reaction is 7.1 109/M·s at 25°C.
2 NO(g) + O2(g) 2 NO2(g)
What is the rate constant for the reverse reaction at the same temperature?
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Valdorod
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Re: Enthalpy and Rate Constant
«
Reply #1 on:
April 15, 2008, 12:39:42 PM »
1) you need to use the Clausius-Clapeyron Equation
ln(p1/p2) = H/R(1/t1-1/t2)
you have p1, t1, p2, t2. R is the ideal gas constant 8.314 x 10-3 kJ/K*mol
solve for H(enthalpy)
2) Krev = K
-1
, thus just take the inverse.
Valdo
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