1. Done By: Joza Aldossary ( 200700686) Noorah Alsulaim (200900099)
EXPERIMENT # 14 Application Of Gas Laws: Determination Of The Universal Gas Constant (R)
Done By: Joza Aldossary ( )
Noorah Alsulaim ( )

2. The Objective Of The Experiment:
The objectives of this lab are: A) To experimentally determine the value of the gas constant (R). B) To experimentally determine the volume of one mole of a gas at standard temperature and pressure.

3. The Materials Used In The Experiment:
Ml Beaker. 2- Burette. 3- Thermometer. 4- Pipette. 5- Hydrochloric Acid. 6- Magnesium Ribbon. 7- Water. 8- Distilled Water.

4. The Procedure Of The Experiment
1- Get a small strip of Magnesium ribbon and weight it by the electric balance. ( Mass = g ) 2- Fill the 800 ml beaker with water to the top.

5. 3- By Pipette, take 10 ml of acid and add it to the burette.
4- Add distilled water to the burette until is full.

6. 5- Now fold the Mg strip in the middle of the burette.

7. 6- Place your finger on the top of the burette
6- Place your finger on the top of the burette. Turn the burette inside water. Now remove your finger.
VIDEO #1

8. 7- Now the reaction between acid and Mg strip will start
7- Now the reaction between acid and Mg strip will start. The bubble will flow from down to up as it shown in the video.
VIDEO #2

9. 8- After the reaction complete, read
The final level of the water = 3.5 (ML)
The temperature= 19 (Celsius)
9- From the vapor pressure of water table in page# 118, pick the vapor pressure of water depend on the temperature (torr).
The vapor pressure of water = 16.5 torr

10. Calculations:
10- From the Periodic Table find the molar mass of mg. The molar mass of mg= moles. 11- Moles of Mg reacted= mass of Mg/ molar mass of Mg= 0.025/ = moles. 12- Moles of H2 FORMED= moles.

11. 13- Convert the temperature from Celsius to Kelvin= = 292 k 14- Convert volume of H2 from ML to L = = 21.5 / 1000= l 15- Pressure of dry h2 (p)= 760-vapor pressure of water) = 743.5/760= ATM 16- In the end find R, the gas Constance R=PV/NT= .07 (atm.L/k.Mole)

12. Summary:
In this experiment we’ve learned that Magnesium react with acid to give H2 gas.
We learned how to calculate the temperature, the volume and the gas Constance R