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(The Ideal Gas Constant), Winter 2021

Include your student number and your signature on every page of work you submit. The lab must be completed on this template (either printed/handwritten/scanned, or typed). If the report is typed, proper scientific syntax/notation is required (e.g., 5.76 x 10 instead of 5.75*10^6).

**NOTE:** This lab report must be an independently produced piece of work. Collaboration of any kind is not permitted and violates the Senate Policy on Academic Honesty.

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**1. (Part 1 of lab) Report the ΔP (kPa) that resulted from the injection of 10.0 mL water (to 1 decimal place). Perform three runs in total. The temperature in the water bath should be constant to the nearest degree.**

| Run | ΔP (kPa) |
|-----|----------|
| 1 | |
| 2 | |
| 3 | |

**Average Temperature in all runs (K):**

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**2. (Part 2 of lab) Fill in the following boxes as you complete the synthesis of hydrogen gas using magnesium. Perform three runs in total.**

| Run | Mass of Mg (mg) | ΔP measured (kPa) | Avg pressure change due to injection (Pa) | Partial pressure of Hâ‚‚ (kPa) | Temperature (K) |
|-----|------------------|--------------------|-----------------------------------------|-----------------------------|-----------------|
| 1 | | | | | |
| 2 | | | | | |
| 3 | | | | | |

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Here is the data from Lab 2, part 2. The experiment was performed a total of three times. The temperature of the water bath for all experiments is the same as it was in part 1. The volume of the flask (plus tubing and gas pressure sensor) is given in the lab manual.

| Experiment | Mass of Mg (g) | Pressure before HCl added (kPa) | Pressure after HCl added (kPa) |
|------------|----------------|----------------------------------|--------------------------------|
| 1 | 2.3 x 10^-2 | 100.6 | 123.7 |
| 2 | 2.2 x 10^-2 | 100.4 | 124.1 |
| 3 | 2.3 x 10^-2 | 100.0 | 124.3 |

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Here is your personalized data from Lab 2, part 1. This experiment was performed three times. The temperature of the water bath was 20 °C.

| Experiment | Pressure before injection (kPa) | Pressure after injection (kPa) |
|------------|---------------------------------|--------------------------------|
| 1 | 99.2 | 107.6 |
| 2 | 99.8 | 107.8 |
| 3 | 99.7 | 107.0 |

Answer :

The average pressure change due to the injection of 10.0 mL of water is 8.4 kPa.

The pressure change due to the injection of water is calculated by subtracting the pressure before the injection from the pressure after the injection. The average pressure change is the change in pressure that is averaged over multiple measurements. The average pressure change is calculated by averaging the pressure changes from the three runs.

The pressure change due to the injection of water is caused by the volume of water that is injected into the flask. When the water is injected, it takes up space in the flask, which decreases the volume of the gas. This decrease in volume causes an increase in pressure.

The average pressure change is a way of quantifying the amount of pressure that is caused by the injection of water. It is important to measure the average pressure change because it can be used to calculate the volume of gas that is produced by the reaction.

The pressure change due to the injection of water is:

(107.6 - 99.2) + (107.8 - 99.8) + (107 - 99.7) / 3 = 8.4 kPa

Therefore, the desired average pressure change due to the injection of 10.0 mL of water is 8.4 kPa.

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