Abrine is used to measure the absolute permeability of a core plug. the rock sample is 4 cm long and 3 cm 2 in cross section. the brine has a viscosity of 1.0 cp and is flowing a constant rate of 0.5 cm3/sec ( cube centimeter per second) under a 2.0 atm pressure differential.
calculate the absolute permeability.

Answer : The absolute permeability is, 0.111 darcys.

Explanation : Given,

Volumetric constant rate =

Cross section area =

Pressure = 2 atm

Viscosity = 1.0 cp

Length of rock = 4 cm

From the Darcy equation  we conclude that,

where,

A = cross section area

P = pressure

= viscosity

l = length of rock

Now put all the given values in the above formula, we get:

Therefore, the absolute permeability is, 0.111 darcys.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.