Question

At 25oC, three moles of a gas occupy a volume of 4.0 L at 1.9 kPa. If the volume increases to 12.0 L, what will the new pressure be?

A. 5.70 kPa
B. 0.63 kPa
C. 1.0 kPa
D. 3.3 kPa

Answer 1

it is 0.63kPa for apex..

Answer 2

the answer:
according to Boyle's law concerning Pressure (P), Volume (V), Temperature (T) and number of mole (n) , we have the famous formula:

PiVi = Pf Vf,

Pi=1.9kPa
Vi= 4L
Vf = 12L
T=25
n=3
Pf = ?
let's find the value of Pf
from the equation
PiVi = Pf Vf we can have Pf= PiVi / Vf

Pf = 1.9*4 / 12 = 0.63

so the answer is B. 0.63 kPa