Question

A gas occupies an initial volume of 400cc at pressure 2atm if pressure is changed to 5 atm the volume was found to be 200 cc calculate the value of2atm

Answer 1

Answer:

when a gas is held at a constant temperature and mass in a closed container, the volume and pressure vary inversely. The equation to use is  

P 1 V 1 = P 2 V 2

Given :-

V 1 = 200

mL × 1

L 1000

mL = 0.2 L  P

1 = 700 mmHg  

V 2 = 100

mL ×1

L 1000

mL = 0.1 L

Unknown:-

P 2

Equation :-

P 1 V 1 = P 2 V 2

Solution :-

Rearrange the equation to isolate  P 2  and solve.

P 2 = P 1  V 1V  2  P 2 = ( 700 mm Hg × 0.2 L )

0.1 L = 1400 L , which must be rounded to  

1000 L

because all of the measurements have only one significant figure.

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