EXPERIMENT CHARLES\' LAW PURPOSE To observe and verify the relationship between

Question

EXPERIMENT CHARLES' LAW PURPOSE To observe and verify the relationship between the temperature and volume of a sample of a gas expressed in Charles' Law. BACKGROUND One of the most familiar properties of a sample of ga is that at constant pressure the volume of the sample increases as the temperature increases. Likewise, the volume will decrease when the temperature is lowered. According to the Kinetic-Molecular Theory of gases, at a higher temperature, the molecules in the sample have a greater velocity and therefore will push against the sides of the container with greater force. IF THE CONTAINER IS EXPANDABLE (such as a balloon, a tire, or a cylinder with a movable piston), the volume will increase until the pressure inside the container is the same as the pressure outside. Balloon @T1 pressure inside pressure outside After heating, balloon @Tz The number of molecules is the same inside the balloon. They are moving faster and push the sides of the balloon out until pressure inside pressure outside The relationship between temperature and volume, when the pressure stays the same and the number of particles in the sample stays the same, is expressed by CHARLES' LAW If the temperature is expressed in the Kelvin scale (K C+ 273.15) the relationship is: EXPERIMENT 9 135

Explanation / Answer

Ans 2

Part a

Charles' law states that

Volume is directly proportional to the absolute temperature of an ideal gas at constant pressure .

V1 = 18.65 L

T1 = 46°C + 273 = 319 K

V2 =?

T2 = 15°C + 273 = 288 K

V2/V1 = T2/T1

V2 = (288/319)* 18.65

= 16.84 L

Part b

V1 = 18.65 L

T1 = 46°C + 273 = 319 K

V2 = 25.5 L

T2 =?

V2/V1 = T2/T1

T2 = (25.5/18.65)*319

= 436.16 K

= 163.16°C

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