how much energy is required to produce hydrogen?
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A 100% efficient electrolyser requires 39 kWh of electricity to produce 1 kg of hydrogen. The devices today require as much as 48 kWh/kg. So, if electricity costs are 0.05 US$/kWh, the power cost for the electrolysis process alone is 2.40 US$/kg of hydrogen.
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However, current best processes for water electrolysis have an effective electrical efficiency of 70-80%, so that producing 1 kg of hydrogen (which has a specific energy of 143 MJ/kg or about 40 kWh/kg) requires 50–55 kWh of electricity.
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Hydrolysis of 1 mole of ATP into ADP releases 30.5 kilo joules or 7.5 kilo caloriesof energy. This energy is liberated because of the cleavage of high energy phosphate bond in ATP converting it into ADP.
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Until recently, the platinum catalyst that splits the hydrogen into an ion and an electron has been prohibitively expensive. Up to a few years ago, hydrogen fuel cells cost around $1000 for every kilowatt of power they generated – or around $100,000 per car.
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The atomic mass of hydrogen is 1 g/mole. To make up 1 kilogram or 1000 g of hydrogen element, 1000 moles of hydrogen is required. Each mole has a Avogadro's number of atoms or atoms. Thus, 1 kg hydrogen element or 1000 moles of hydrogen have atoms (or 1000 times the Avogadro's number).
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High temperature - The high temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons. Fusion requires temperatures about 100 million Kelvin (approximately six times hotter than the sun's core).
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Question: How Much Energy (in KJ) Is Required To Ionize 2.78 Moles Ofhydrogen Atoms? answer: 3.65 X 10^3 KJ I Can Never Get This Answer.
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To produce 1 kg of hydrogen, nine times the amount of water is necessary, i.e. nine litres.
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a) 13.6 eV / (2)2 = 3.40 eV is required to ionize a hydrogen atom from state n = 2.
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From the above reaction, 2 moles of hydrogen will react with 1 mole of oxygen. Hence, 1 mole of oxygen is required.
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Hydrogen gas can be made by reacting methane (CH4) with high temperature steam: CH4(g) + H2O(g) ---> CO(g) + 3H2(g) How many hydrogen molecules are produced when 256 grams of methane reacts with steam?
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Electrolysis of water However, current best processes for water electrolysis have an effective electrical efficiency of 70-80%, so that producing 1 kg of hydrogen (which has a specific energy of 143 MJ/kg or about 40 kWh/kg) requires 50–55 kWh of electricity.
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Overall reaction: 2 H2O(l) → 2 H2(g) + O2(g) The number of hydrogen molecules produced is thus twice the number of oxygen molecules.
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Fuel Cells. A fuel cell is a device that converts chemical potential energy (energy stored in molecular bonds) into electrical energy. A PEM (Proton Exchange Membrane) cell uses hydrogen gas (H2) and oxygen gas (O2) as fuel.
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The formula H2O indicates that each molecule of this substance contains one oxygen and two hydrogen atoms. Therefore, if we ask how much hydrogen is required to make a given quantity of water, the answer is two hydrogen atoms for each oxygen atom or two hydrogen atoms per molecule.
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Since you have 10 moles of hydrogen, at that ratio you will need 5 moles of oxygen to for the reaction to use all the hydrogen. Since oxygen weighs ~16 grams per mole, you add 5 × 16 g, or 80 g to the 10.1 g from the 10 moles of hydrogen to get 90.1 grams of H2O.
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Hence, the energy required to remove an electron from $$n=2$$ state in hydrogen is +3. 4 eV.