Lab #4 charles PDF

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Lab report for Charles law...

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Charles’ Law

CHE 110-07

10/11/2017

Introduction: In this week’s experiment, we verified the linear relationship between volume and temperature; it is called Charles’ Law. We were to determine the volume at absolute temperature by graphical analysis. In this experiment, the volume of a given amount of air trapped in a graduated pipet is measured as a function of temperature.

Charles’ Law states that at constant pressure, the volume of a fixed amount of an ideal gas is proportional to its absolute temperature. Data: Temper at ur e

Vol ume( mL) bot t om

Vol ume( mL) t op

Netv ol umeof ai r( mL )

Room Temper at ur e

19. 9º C

7. 62mL

5. 61mL

2. 01mL

HotWat er

77. 5º C

7. 49mL

3. 61mL

3. 88mL

72. 5º C

7. 49mL

3. 60mL

3. 89mL

67. 5º C

7. 50mL

3. 75mL

3. 75mL

62. 5º C

7. 50mL

3. 81mL

3. 69mL

57. 5º C

7. 50mL

3. 88mL

3. 62mL

52. 5º C

7. 51mL

3. 95mL

3. 56mL

47. 5º C

7. 51mL

4. 00mL

3. 51mL

42. 5º C

7. 51mL

4. 04mL

3. 47mL

37. 5º C

7. 52mL

4. 12mL

3. 40mL

32. 5º C

7. 53mL

4. 17mL

3. 36mL

4. 1º C

7. 57mL

4. 57mL

3. 00mL

Col dWat er

Today’s atmospheric pressure: 760mmHg Density of air: 0.001205 g/mL

Graphs and calculations: 1.

2. n= (.00201 L)(1.205 g *L-1)/29.0 g*mol-1 = 8.352 x10^-5 moles 3. R=CP/n =(.00001838)(1)/8.352 x10^-5 =0.22 L*atm/mol K 4. R=0.08206 L*atm/mol K

Results and discussion: What I learned from today’s lab is how volume and temperature relate to each other when taking the measurements and plotting them in a graph.

Definitely, possible error such as heat from our hands can transfer over to graduated cylinder which could change temperature of water.

Questions: 1. This experiment deals with the relationship between volume and temperature for a fixed amount of gas at constant pressure. Design an experiment, which would allow you to study the relationship between pressure and temperature for a fixed amount of gas at constant volume. Show a diagram of the apparatus and a plot of P versus T for the data you expect to obtain. Is the relationship between P and T direct or

inverse?

As the temperature increases the pressure also increases and vice versa. 2. In this experiment, air was assumed to be an ideal gas. Does this assumption lead to a significant error? Explain your answer? This assumption would probably not lead to significant error unless the experiment is conducted through a change that would change the gas. 3. Show by calculation that the weighted-average “molecular weight” of air is 29.0 g ⋅ mol-1.

O 2 and N 2 are prevalent in air and make up almost entirely all of an air molecule. 6.704 (O 2 ) + 21.88(N 2 ) = 29 g(mol-1)...