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Mademuasel [1]
3 years ago
8

How much H2 is generated from the electrolysis of 150 grams of H2O

Chemistry
1 answer:
Romashka [77]3 years ago
5 0

Answer:

16.67 grams  of  H₂ is generated from the electrolysis of 150 grams of H₂O

Explanation:

Electrolysis is the decomposition of a chemical element under the effect of an electric current. So, electrolysis of water is the process of decomposing the H₂O molecule into separate oxygen and hydrogen gases due to an electric current passing through the water.

The balanced equation of electrolysis of water is:

2 H₂O → O₂ + 2H₂

Being:

  • H: 1 g/mole
  • O: 16 g/mole

then the molar mass of the compounds that participate in the reaction is:

  • H₂O: 2*1 g/mole + 16 g/mole= 18 g/mole
  • H₂: 2*1 g/mole= 2 g/mole
  • O₂: 2*16 g/mole= 32 g/mole

If the following amounts in moles are reacted by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction):

  • H₂O: 2 moles
  • H₂: 2 moles
  • O₂: 1 mole

the amount of mass, by stoichiometry, that reacts and is produced is:

  • H₂O: 2 moles*18 g/mole=36 g
  • H₂: 2 moles* 2 g/mole= 4 g
  • O₂: 1 mole* 32 g/mole= 32  g

Then you can apply the following rule of three: if by stoichiometry 36 g of H₂O generate 4 g of H₂, 150 g of H₂O how much mass of H₂ will it generate?

massofH_{2} =\frac{150 grams of H_{2}O*4 grams ofH_{2}  }{36 grams of H_{2}O}

mass of H₂= 16.67 grams

<u><em>16.67 grams  of  H₂ is generated from the electrolysis of 150 grams of H₂O</em></u>

<u><em></em></u>

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