A mixture of H2 and water vapor is present in a closed vessel at 20°C. The total pressure of the system is 755.0 mmHg.

Partial pressure of water vapor at 20°C equals 17.5 mmHg.

What is the partial pressure of H2?

Partial pressure of hydrogen gas in the mixture  is 732.5 mm Hg.

Explanation:

Data given:

total pressure of the system = 755 mm Hg

partial pressure of water vapour, pwater vapour = 17.5 mmHg

partial pressure of hydrogen gas, phydrogen gas = ?

temperature of the system = 20 degrees

According to Dalton law of pressure, the pressure exerted by each gas is independent and individual.

The total pressure is the sum of partial pressures of gases present in a mixture.

Ptotal = pwater vapour + p hydrogen gas

phydrogen gas  = P total - p water vapour

p hydrogen gas = 750 - 17.5

phydrogen gas = 732.5 mm Hg.

thus the partial pressure of the hydrogen gas in the mixture is 732.5 mm Hg.

a is the answer to this question

explanation:

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.