Identical vessels were filled: one with hydrogen, the other with oxygen. Compare the pressures of these gases

| July 19, 2021 | education

Identical vessels were filled: one with hydrogen, the other with oxygen. Compare the pressures of these gases if they are the same a) masses; b) the number of molecules.

It is necessary to compare the pressures if their masses are the same. Hydrogen has a molar mass Mn = 0.002 kg. Oxygen has a molar mass of Mo = 0.032 kg. Since the masses of the gases are the same, we will find the ratio of the molar masses of these gases.

Mo / Mn = 0.032kg / 0.002kg = 16.

It follows that hydrogen has 16 times more moles than oxygen. And since one mole of a substance occupies an equal volume of 22.4 liters. Consequently, according to the Boyle-Mariotte law, the pressure of hydrogen will be 16 times that of oxygen.

It is necessary to compare the pressures if the number of molecules is the same. With an equal number of molecules, the number of moles of gases is the same, which means that the pressures are equal.



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