1. A mixture of helium, nitrogen, and oxygen has a total pressure of 755 mmHg .

Question

1. A mixture of helium, nitrogen, and oxygen has a total pressure of 755 mmHg . The partial pressures of helium and nitrogen are 238 mmHg and 195 mmHg , respectively.What is the partial pressure of oxygen in the mixture?

2. What volume of O2 at 912 mmHg and 33 C is required to synthesize 19.5 mol of NO?

Express your answer to three significant figures and include the appropriate units.

3. What volume of Cl2 gas, measured at 687 torr and 39 C, is required to form 23 g of NaCl?

Express your answer using two significant figures.

Explanation / Answer

1)

total pressure = 755 mmHg

partial pressure of He = 238 mmHg

partial pressure of N2 = 195 mmHg

Ptotal = PHe +   PN2 + PO2

755 = 238 +195 + PO2

PO2 = 322 mmHg

partial pressure of OXygen = 322 mmHg

2)

pressure = 912 mmHg = 1.2 atm

temperature = 33 + 273 = 306 K

moles = 19.5 mol

P V = n R T

1.2 x V = 19.5 x 0.0821 x 306

V = 408.2 L

volume of O2 = 408.2 L

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