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PROBLEM

A 2.00 L container is filled with Ar(g)\mathrm{Ar}(\mathrm{g}) at 752 mmHg and 35C35^{\circ} \mathrm{C}. A 0.728 g sample of C6H6\mathrm{C}_{6} \mathrm{H}_{6} vapor is then added.
a) What is the total pressure in the container?
(b) What is the partial pressure of Ar and of C6H6\mathrm{C}_{6} \mathrm{H}_{6} ?

STEP 1

1. The container is rigid with a volume of 2.00 L.
2. The initial pressure of argon gas (Ar(g)\mathrm{Ar(g)}) is 752 mmHg.
3. The temperature is 35C35^{\circ} \mathrm{C}.
4. A 0.728 g sample of benzene (C6H6\mathrm{C}_{6} \mathrm{H}_{6}) vapor is added.
5. Ideal gas law applies to both gases.

STEP 2

1. Convert temperature to Kelvin.
2. Calculate the number of moles of C6H6\mathrm{C}_{6} \mathrm{H}_{6}.
3. Use the ideal gas law to find the partial pressure of C6H6\mathrm{C}_{6} \mathrm{H}_{6}.
4. Calculate the total pressure in the container.
5. Determine the partial pressures of Ar\mathrm{Ar} and C6H6\mathrm{C}_{6} \mathrm{H}_{6}.

STEP 3

Convert the temperature from Celsius to Kelvin.
T(K)=35C+273.15=308.15K T(K) = 35^{\circ} \mathrm{C} + 273.15 = 308.15 \, \mathrm{K}

STEP 4

Calculate the number of moles of C6H6\mathrm{C}_{6} \mathrm{H}_{6}.
The molar mass of C6H6\mathrm{C}_{6} \mathrm{H}_{6} is approximately 78.11g/mol78.11 \, \mathrm{g/mol}.
n=massmolar mass=0.728g78.11g/mol0.00932mol n = \frac{\text{mass}}{\text{molar mass}} = \frac{0.728 \, \mathrm{g}}{78.11 \, \mathrm{g/mol}} \approx 0.00932 \, \mathrm{mol}

STEP 5

Use the ideal gas law to find the partial pressure of C6H6\mathrm{C}_{6} \mathrm{H}_{6}.
The ideal gas law is PV=nRTPV = nRT.
PC6H6=nRTV P_{\mathrm{C}_{6} \mathrm{H}_{6}} = \frac{nRT}{V} Where:
- R=0.0821Latm/(molK) R = 0.0821 \, \mathrm{L \cdot atm/(mol \cdot K)}
- n=0.00932mol n = 0.00932 \, \mathrm{mol}
- T=308.15K T = 308.15 \, \mathrm{K}
- V=2.00L V = 2.00 \, \mathrm{L}
PC6H6=0.00932mol×0.0821Latm/(molK)×308.15K2.00L P_{\mathrm{C}_{6} \mathrm{H}_{6}} = \frac{0.00932 \, \mathrm{mol} \times 0.0821 \, \mathrm{L \cdot atm/(mol \cdot K)} \times 308.15 \, \mathrm{K}}{2.00 \, \mathrm{L}} PC6H60.118atm P_{\mathrm{C}_{6} \mathrm{H}_{6}} \approx 0.118 \, \mathrm{atm} Convert to mmHg: 0.118atm×760mmHg/atm89.68mmHg0.118 \, \mathrm{atm} \times 760 \, \mathrm{mmHg/atm} \approx 89.68 \, \mathrm{mmHg}

STEP 6

Calculate the total pressure in the container.
The total pressure is the sum of the initial pressure of Ar\mathrm{Ar} and the partial pressure of C6H6\mathrm{C}_{6} \mathrm{H}_{6}.
Ptotal=PAr+PC6H6 P_{\text{total}} = P_{\mathrm{Ar}} + P_{\mathrm{C}_{6} \mathrm{H}_{6}} Ptotal=752mmHg+89.68mmHg841.68mmHg P_{\text{total}} = 752 \, \mathrm{mmHg} + 89.68 \, \mathrm{mmHg} \approx 841.68 \, \mathrm{mmHg}

SOLUTION

Determine the partial pressures of Ar\mathrm{Ar} and C6H6\mathrm{C}_{6} \mathrm{H}_{6}.
- Partial pressure of Ar\mathrm{Ar} is given as 752mmHg752 \, \mathrm{mmHg}.
- Partial pressure of C6H6\mathrm{C}_{6} \mathrm{H}_{6} is calculated as 89.68mmHg89.68 \, \mathrm{mmHg}.
The total pressure in the container is approximately 841.68mmHg841.68 \, \mathrm{mmHg}.
The partial pressure of Ar\mathrm{Ar} is 752mmHg752 \, \mathrm{mmHg} and the partial pressure of C6H6\mathrm{C}_{6} \mathrm{H}_{6} is 89.68mmHg89.68 \, \mathrm{mmHg}.

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