A student designs an ammeter (a device that measures electrical current) that is

Question

A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydrogen and oxygen gases. When electrical current of unknown magnitude is run through the device for 2.50min , 15.8mL of water-saturated H2(g) is collected. The temperature and pressure of the system are 25 ?Cand 715 torr.

How many moles of hydrogen gas are produced?

Express your answer to three significant figures and include the appropriate units.

± Electrolysis and Current The vapor pressure of water changes with temperature, as shown here T (C) P (torr) 18.7 19.8 21.1 22.4 23.8 25.2 26.7 28.4 30.0 31.8 21 23 24 25 26 27 28 29 30

Explanation / Answer

molecular excess weight associated with normal water is actually 2 They would (molecular excess weight 1) + 1 Air (Molecular excess weight 16) for just a overall associated with 17. In addition to for each and every Molecule associated with normal water transformed, we might get 2 Elements associated with Hydrogen.

right now the actual problem is actually, what number of elements associated with normal water do you have in a 15. 8mL associated with normal water? The actual solidity associated with normal water is actually 1g/(cm3) so the mass of the normal water is actually, 15. 8mg. 1 mole associated with 6. 02x1023 elements associated with normal water is actually identical contains the mass with h corresponding to the actual molecular excess weight or 17 h per mole. thus 15. 8m h fits to be able to about 5. twenty six x1023 elements associated with normal water.

At this point, in the event every single one of the people elements were being changed into Hydrogen we might get doubly a lot hydrogen once we received associated with normal water. or 21. 2 x1024 elements associated with hydrogen. however given that hydrogen is usually a diatomic molecule, for example the actual hydrogen that people look at is actually H2, we might get 9. 51 x1024 elements associated with hydrogen. from 1 atmospheric demand and also 273K, 1 mole associated with hydrogen fills somewhere around 25. 4L associated with quantity. thus 5. twenty six x1023 elements or about 0. 87 moles, would certainly load 21. 66 Liters associated with quantity.

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