What is the total pressure, in millimeters of mercury, of a gas mixture containing argon gas at 0.23 atm, helium gas at 290 mmHg, and nitrogen gas at 390 torr ?

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**Total Pressure Calculation of a Gas Mixture**

**Problem:**
What is the total pressure, in millimeters of mercury, of a gas mixture containing argon gas at 0.23 atm, helium gas at 290 mmHg, and nitrogen gas at 390 torr?

**Instructions:**
Express your answer using two significant figures.

**Calculation Box:**
\[ P_{\text{total}} = \boxed{} \] mmHg

---

**Explanation:**

To solve this problem, you need to sum the partial pressures of the individual gases in the same unit (mmHg). Here are the pressures of the gases listed in different units:

- Argon: 0.23 atm
- Helium: 290 mmHg
- Nitrogen: 390 torr

Note that 1 atm = 760 mmHg and 1 torr = 1 mmHg.

First, convert the pressure of argon gas from atm to mmHg:
\[ 0.23 \text{ atm} \times 760 \text{ mmHg/atm} = 174.8 \text{ mmHg} \]

Now, add all the pressures together:
\[ P_{\text{total}} = 174.8 \text{ mmHg} + 290 \text{ mmHg} + 390 \text{ mmHg} \]

\[ P_{\text{total}} = 854.8 \text{ mmHg} \]

Rounded to two significant figures, the total pressure is:
\[ P_{\text{total}} \approx 850 \text{ mmHg} \]

**Summary:**
The total pressure of the gas mixture is approximately 850 mmHg when expressed using two significant figures.
Transcribed Image Text:**Total Pressure Calculation of a Gas Mixture** **Problem:** What is the total pressure, in millimeters of mercury, of a gas mixture containing argon gas at 0.23 atm, helium gas at 290 mmHg, and nitrogen gas at 390 torr? **Instructions:** Express your answer using two significant figures. **Calculation Box:** \[ P_{\text{total}} = \boxed{} \] mmHg --- **Explanation:** To solve this problem, you need to sum the partial pressures of the individual gases in the same unit (mmHg). Here are the pressures of the gases listed in different units: - Argon: 0.23 atm - Helium: 290 mmHg - Nitrogen: 390 torr Note that 1 atm = 760 mmHg and 1 torr = 1 mmHg. First, convert the pressure of argon gas from atm to mmHg: \[ 0.23 \text{ atm} \times 760 \text{ mmHg/atm} = 174.8 \text{ mmHg} \] Now, add all the pressures together: \[ P_{\text{total}} = 174.8 \text{ mmHg} + 290 \text{ mmHg} + 390 \text{ mmHg} \] \[ P_{\text{total}} = 854.8 \text{ mmHg} \] Rounded to two significant figures, the total pressure is: \[ P_{\text{total}} \approx 850 \text{ mmHg} \] **Summary:** The total pressure of the gas mixture is approximately 850 mmHg when expressed using two significant figures.
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