Chem Time !!! States of matter

There are three states of matter solid, liquid and gas

 -The  condition of the these three states may be changed based on changes made to its  temperature, volume and pressure
-  Boyle's Law is used to calculate the unknown  pressure or volume
P1V1 = P2V2 

eg. 600 cm3 of gas at constant temperature atone atmosphere has its pressure increased to 9 atm
What is its new volume?
ANS :
P1V1 = P2V2  can be  rearranged
V2 = P1V1/P2 =  1x 600/9 = 66.7 cm3


- Charles' Law is used  to calculate an unknown volume or temperature
V1/T1 = V2/T2

eg.  A gas of volume 100 cm3 at 273K rises to a volume of  300cm3 at constant pressure. What temperature is the increased volume of gas?
ANS:

V1/T1 = V2/T2 can be rearranged to
T2=V2 xT1 /V1
T2 =100 /300 x 273K = 819K

- The General Gas Law is formed by the Combination of the Boyle's and  Charles' Law

P1V1 /T1  = P2V2/T2

eg. A 4 litre volume of gas with a pressure of  2 atm and temperature of  800K has its volume kept  constant  but its temperature raised to 1000K. What is the new pressure of the gas.

The  gas law equation is rearranged to

P2 = P1xV1xT2 /T1x V2
 =2x4x 1000/ 800 x 4
= 1.25 atm