  # Gasss

Pages: 2 (273 words) / Published: Jul 24th, 2013
5.04H: Gas Stoichiometry Lab Worksheet

Name: _________________________

Data and Observations:
Present all relevant data in a data table below. Include an observations section for any observations that you made during the lab. (5 points)
|Data Table |
|Mass of magnesium strip (grams) | |
|Volume of gas collected (mL) | |
|Barometric pressure (atm) | |
|Room Temperature (°C) | |
|Vapor pressure of the water (torr) | |

Calculations:

1. Write the balanced equation for the reaction conducted in this lab, including appropriate phase symbols. (2 points)

2. Determine the partial pressure of the hydrogen gas collected in the gas collection tube. (3 points)

3. Calculate the moles of hydrogen gas collected. (4 points)

n = [pic]

4. If magnesium was the limiting reactant in this lab, calculate the theoretical yield of the gaseous product. Show all steps of your calculation. (4 points)

5. Determine the percent yield of this reaction, showing all steps of your calculation. (3 points)

Percent Yield = [pic] × 100

Conclusion:
1. Would the following errors increase, decrease, or have no effect on the calculated moles of gas collected in the experiment? Explain your answers in complete sentences.

a) The measured mass of the magnesium was smaller than the true mass. (3 points)

b) The actual temperature of the hydrogen gas is less than room temperature. (3 points)

2. Explain in terms of particle collisions and Dalton’s law why it can be assumed that the total pressure inside the gas collection tube is equal to the atmospheric pressure outside of the tube. (4 points)

3. If