1) Methanol can be produced by the following reaction:(adsbygoogle = window.adsbygoogle || []).push({});

CO (g) + 2H2 (g) --> CH30H (g)

How is the rate of disappearance of hydrogen gas related to the rate of appearance of methanol?

-delta[H2]/delta t = ?

a. + delta [H2]/delta t

b. + 1delta[CH3OH]/2delta t

c. + 2 delta [CH3OH]/delta t

d. none of the above

Is it d because the rates are supposed to be determined experimentally?

2) The first order isomerization of cyclopropane -> propene has a rate constant of 0.00026 1/sec at 435 Celsius with an activation energy of 264 kJ/mol. What is the temperature at which the rate constant is 0.00447 1/sec? Calculate your answer in kelvins.

k2 = 0.00447 1/s

k1 = 0.00026 1/s

T1 = 435 C = 708.15 K

E_a = 264 kJ/mol = 2640 J/mol

ln (k2/k1) = (-E_a/R)*[(1-T2) - (1/T1)]????

1/T2 = [-ln (k2/k1)/(-E_a/R)] + (1/T1)

1/T2 = -ln(0.00447/.00026)/[-2640 J/mol/(8.314)] + (1/708.15 K)

=0.0096133567 + (1/708.15 K) = 0.011025

1/0.011025 = 90.69 K = 90.7 K???

Is the correct final answer and method?

Thank you.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Reaction Rate and Activation Energy

**Physics Forums | Science Articles, Homework Help, Discussion**