Asample of h2 is collected over water such that the combined hydrogen–water vapor sample is held at a pressure of 1 standard atmosphere. what is the partial pressure of the h2 if that of the water vapor is 2.5 kpa? question 18 options: 2.5 kpa 101.3 kpa 98.8 kpa 103.8 kpa

The total pressure of a mixture of gases equals the sum of the partial pressures of the indiviudal gases in the sample.

So, combined hydrogen-water vapor pressure = partial pressure of H2 + partial pressure of water

Convert 1 atm to kPa: 1 atm = 101.325 kPa

=> 101.325 kPa = Partial pressure of H2 + 2.5 kPa

=> Partial pressure of H2 = 101.325 kPa - 2.5 kPa = 98.825 kPa

98.8 kPa

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