If 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.
Percent yield is the ratio of the actual yield times the theoretical yield to 100. When the actual and theoretical yield are equal, the percentage yield is 100%. So if the actual yield is less than the theoretical yield then the percentage yield is less than 100%. This situation may arise due to the incompleteness of the reaction or the loss of the sample during the recovery process.
According to the stoichiometry of reaction of formation of water,
4 g hydrogen gives 36 g water, thus, 20 g hydrogen gives 20×36/4=180 g water which is theoretical yield.
So, the percent yield=observed yield/theoretical yield×100
percent yield=9/180×100=5%.
Thus, if 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.
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Answer:
12.5%
Explanation:
32/16 = 2 moles of oxygen
2 x 18.01 x 2/1 = 72.04 g of H2O
9/72.04 x 100 = 12.5%
balanced equation: 2H2 + O2 → 2H2O
limiting reactant is oxygen
Answer:
They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
Hope this helps :)
Answer:
Groups one of the periodic table.
Lithium Li
Sodium Na
Potassium K
Rubidium Rb
Cesium Cs
Francium Fr
The number with a higher value is the number of electrons, and the number with a lower value is the number of protons.
The number with a higher value is the mass, and the number with a lower value is the number of protons.
The number with a higher value is the number of protons, and the number with a lower value is the mass.
B. Chemistry helps them keep accurate health records.
C. Chemistry helps them understand how medicines work.
D. Chemistry helps them learn the parts of the body.
Option D. Chemistry helps them learn the parts of the body is the reason need to understand chemistry.
Chemistry exists as the branch of science that contracts with the properties, composition, and arrangement of elements and compounds, how they can vary, and the energy that exists released or absorbed when they change.
Nurses must utilize organic chemistry to determine how the bodies of their patients metabolized glucose, and how the body responds to it. On a more complex level, nurses must cause conclusions based on their knowledge of organic chemistry to help protect the lives of their patients.
Hence, Option D. Chemistry helps them learn the parts of the body is the reason need to understand chemistry.
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(2) low first ionization energy and high electronegativity
(3) high first ionization energy and low electronegativity
(4) high first ionization energy and high electronegativity
Answer:
low first ionization energy and low electronegativity
Explanation:
Metals are typically characterized by low first ionization energy and low electronegativity. This is because metals can easily lose electrons to become positive ions and do not attract electrons strongly.
Two properties that are typically associated with metals are low first ionization energy and low electronegativity. Therefore, the correct option is (1).
Ionization energy is the energy required to remove an electron from an atom. Metals have low first ionization energy because they can easily lose an electron to become positive ions. Electronegativity is a measure of the ability of an atom to attract electrons. Metals have low electronegativity because they do not attract electrons strongly.
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