Given the balanced equation representing a reaction:

CH4(g) + 2O2(g) —> CO2(g) + 2H2O(g) + energy

Which change in reaction conditions will increase the frequency of effective collisions between reactant molecules ?

a. increasing the volume of the reactants
b. increasing the concentration of the reactants
c. decreasing the pressure of the reactants
d. decreasing the temp. of the reactants

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.