The volume of the gas is high and molar volume is also high.
A eudiometer is used to measure the change in the volume of the gas produced in the physical and chemical change. Air in the eudiometer is recorded during the experiment. leaked in to the water bath is also recorded during the experiment.so the measured volume is high. As the volume of the hydrogen gas is high. The volume is directly proportional to the number of moles of the gas ,the molar volume of the gas is also high. This is according to the Avogadro's law. Due to the presence of leaked air there are high volume of gas as well as high molar volume .
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