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Svetradugi [14.3K]
3 years ago
12

If the o2 is collected over water at 25 c (298 k) and 724.0 mm hg total pressure, how many mols o2 will a 1.00 l sample of colle

cted gas contain?
Chemistry
1 answer:
Marina CMI [18]3 years ago
3 0
To answer this item, it is assumed that O2 is an ideal gas such that it follows the ideal gas law.

    PV = nRT

Solving for n,
    n = PV / RT

where n is number of moles, P is pressure, V is volume, R is the universal gas constant, T is the temperature. 

Substituting the known values,
     n = (724 mmHg/760 mmHg/1 atm)(1 L) / (0.0821 L. atm/mol.K)(298 K)

Simplifying,
   n = 0.0389

Hence, the value of n is 0.0389. 
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\displaystyle \frac{P}{P'}=\displaystyle \frac{T}{T'} \\ \displaystyle \frac{845 \textrm{ mmHg}}{1050 \textrm{ mmHg}} = \displaystyle \frac{328 \textrm{ K}}{T'} \\T' = 407.57 \textrm{ Kelvin}

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