The 4% is the percent yield if 18 grams of water are produced when 4 grams of hydrogen with excess oxygen.
What is hydrogen ?
Protium, a proton and a neutron, is the common isotope of hydrogen (H), while Deuterium and tritium are the other two isotopes (a protron and two neutrons). Only hydrogen has had its isotopes given distinct names among all the elements. For fuel in nuclear fusion reactors, both deuterium and tritium are employed.
What is oxygen ?
It is ingested by animals, who then convert it to carbon dioxide, which is then used by plants to create new carbon and release oxygen back into the atmosphere.
2H2++O2------------->2H2O.
So 32g of Oxygen reacts with 4 g of Hydrogen.
Therefore 16 g of oxygen reacts with 2 g of Hydrogen and will form 18 g of water.
The remaining 2 g of Hydrogen will be left unreacted. So 18 g of water will be formed and 2 g of Hydrogen will be left unreacted.
Therefore, 4% is the percent yield if 18 grams of water are produced when 4 grams of hydrogen with excess oxygen.
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What share of modern renewable energy supplies does hydroelectric power account for?.
The shares of modern renewable energy supplies in the Hydroelectric power is 22%.
The Hydropower technologies generate power by using the elevation difference created by a dam or diversion structure of water flowing. The Hydropower is the affordable source of electricity that costs less than others. Hydropower relies only on the energy from moving water. As compared to other electricity sources, hydropower has relatively low costs throughout in terms of maintenance, operations, and fuel. Hydropower's have longer lifespan with low costs. It is a reliable form of backup power during major electricity outages or disruptions. Hydroelectric power produces a number of benefits outside of electricity generation such as flood control, irrigation support, and water supply.
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How many molecules are in 1. 8 g of H2O?.
There are approximately 6.022 x 10^22 (6.022 x 10²²) molecules in 1.8 grams of H2O.
To determine the number of molecules in 1.8 g of H2O, we first need to know the molar mass of H2O. The molar mass of H2O is 18.015 g/mol. To convert the mass of H2O to moles, we divide it by the molar mass:
1.8 g H2O / 18.015 g/mol = 0.1 mol H2O
Next, we use Avogadro's number (6.022 x 10^23) to convert moles to number of molecules:
0.1 mol H2O x 6.022 x 10^23 molecules/mol = 6.022 x 10^22 molecules
So, there are approximately 6.022 x 10^22 (6.022 x 10²²) molecules in 1.8 grams of H2O.
It is worth noting that, 1 mole of any substance contains Avogadro's number of entities of that substance. And Avogadro's number is a fundamental constant of nature which is used to express the number of atoms, ions, or other elementary entities in a given sample of a substance.
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