Question

At constant temperature calculate the pressure of gas in which the volume is 1000cc. originally occupying 1500cc. at 720 mm. of pressure.
YOU MUST USE FORMULA...P1V1=P2V2(Charles' law

Answer 1

Boyle's law: Pressure of a gas decreases with volume and;
The product of the volume of a gas and its pressure is always equal, constant K.

that is  P1V1=P2V2 (that is initial pressure times initial volume will be equal to the                                    resultant volume times resultant pressure)

Therefore:  1500cc x 720mmHg = 1000 x P2
                   P2= 1500 x 720      =  15 x 72 =  1080 mmHg                                                             1000

Therefore the pressure at 1000cc will be 1080mmHg