Question

A 2.86L sample of krypton gas contains a 0.403 mol of krypton. How many additional miles of krypton must be added to this sample to expand its volume to 19.9l assume temperature and pressure remain constant?

Answer 1

From Avogadro's gas law, at constant temperature and pressure, V₁/n₁=V₂/n₂ Where V₁= Initial Volume, n₁= Initial amount/moles, V₂= Final Volume, and n₂= Final amount/moles.

From the data provided,

V₁= 2.86 L

n₁= 0.403 moles

V₂= 19.9 L

n₂= ?

From the law, n₂= (V₂x n₁)/V₁

=(19.9 x 0.403)/2.86

=2.804 moles.

Moles to be added = n₂-n₁

=2.804-0.403

= 2.401moles