In chemistry, stoichiometry
(sometimes called reaction stoichiometry to distinguish it from composition
stoichiometry) is the study and calculate the quantitative relationships of the
reactants and products in chemical reactions (chemical equations). This word
comes from the Greek stoikheion (elements) and metriā (size).
Stoichiometry based on fundamental laws of chemistry, namely the law of conservation of mass, comparative law remains, and the law of multiple comparisons.
Stoichiometric gas is a special form, where all the reactants and gaseous products. In this case, the coefficient of substance (mole ratio is expressed in reaction stoichiometry) also once stated volume ratio between the substances involved.
Stoichiometry based on fundamental laws of chemistry, namely the law of conservation of mass, comparative law remains, and the law of multiple comparisons.
Stoichiometric gas is a special form, where all the reactants and gaseous products. In this case, the coefficient of substance (mole ratio is expressed in reaction stoichiometry) also once stated volume ratio between the substances involved.
LAW OF CHEMICALBasic Chemical s laws
1.Law of Conservation of Mass
1. The Law Of Conservation of massHukum ilmuwankimia conservation of mass was introduced by France, Antoine Lavoisier in 1787. It was believed that the combustion reaction parailmuwan menghasilkangas
phlogistonso that the mass of substance after combustion lebihsedikit than before. It is based padapercobaan conducted Pristley. Pristley oksidaraksa heating (red calx of mercury). Heating the reaction solids oksidaraksa mercury and gas producing colored diatasnya.Setelah not weighed, the mass of mercury less than massaoksida mercury.The law of conservation of mass was found by French chemist, Antoine Lavoisier in 1787. At the time, scientist believed phlogiston That resulted combustion gases, so That the mass of matter after combustion was less than before. It was based on Priestley's experiments. Priestley heated red calx of mercury and it produced mercury in aqueous and colorless gas above. After it was Measured, the mercury mass was less than the mass of mercury oxide.Pristley colored gas does not mention it in terms of phlogiston. However, not demikiandengan Lavoisier, he doubted the existence of phlogiston gas. Presumably, the dimaksudflogiston is oxygen gas. Later, Lavoisier repeated the experiment pristley untukmembuktikan expected. He weighed mass of the substance before and after the reaction of mercury pemanasanoksida carefully on a balance sensitive. Apparently, there penguranganmassa mercury oxide.Called That Pristley colorless gas as phlogiston. However, doubted the existenceof Lavoisier phlogiston gas. He proposed the phlogiston That was Actually oxygen gas. Then, Lavoisier repeated pristeley s experiments to approve his opinion. He Measured the mass of mercury oxidebefore and after the combustion using a very sensitive measure. That he found there was adecrease in mercury oxide mass.Lavoisier explains the reason for the reduced mass after pemanasan.Ketika heated mercury oxide, mercury oxide produces oxygen gas so that its mass will berkurang.Lavoisier also proves the opposite. If a metal is heated in air, its mass will increase with the amount of oxygen taken from the air. Conclusion Lavoisiertersebut known as the law of conservation of mass (amount of substance before and sesudahreaksi unchanged).
Lavoisier explained the reason why mercury oxide Decreased mass. When it was heated, mercury oxide produced oxygen gas, so its mass was Decreased. Lavoisier also proved theopposite reaction. If a metal was heated in water, along with its mass Increased the number of oxygen taken from the water, Lavoisier conclusion is Called the law of conservation of mass (amount of matter Thetotal of the reaction compounds Remains constant).
1.Law of Conservation of Mass
1. The Law Of Conservation of massHukum ilmuwankimia conservation of mass was introduced by France, Antoine Lavoisier in 1787. It was believed that the combustion reaction parailmuwan menghasilkangas
phlogistonso that the mass of substance after combustion lebihsedikit than before. It is based padapercobaan conducted Pristley. Pristley oksidaraksa heating (red calx of mercury). Heating the reaction solids oksidaraksa mercury and gas producing colored diatasnya.Setelah not weighed, the mass of mercury less than massaoksida mercury.The law of conservation of mass was found by French chemist, Antoine Lavoisier in 1787. At the time, scientist believed phlogiston That resulted combustion gases, so That the mass of matter after combustion was less than before. It was based on Priestley's experiments. Priestley heated red calx of mercury and it produced mercury in aqueous and colorless gas above. After it was Measured, the mercury mass was less than the mass of mercury oxide.Pristley colored gas does not mention it in terms of phlogiston. However, not demikiandengan Lavoisier, he doubted the existence of phlogiston gas. Presumably, the dimaksudflogiston is oxygen gas. Later, Lavoisier repeated the experiment pristley untukmembuktikan expected. He weighed mass of the substance before and after the reaction of mercury pemanasanoksida carefully on a balance sensitive. Apparently, there penguranganmassa mercury oxide.Called That Pristley colorless gas as phlogiston. However, doubted the existenceof Lavoisier phlogiston gas. He proposed the phlogiston That was Actually oxygen gas. Then, Lavoisier repeated pristeley s experiments to approve his opinion. He Measured the mass of mercury oxidebefore and after the combustion using a very sensitive measure. That he found there was adecrease in mercury oxide mass.Lavoisier explains the reason for the reduced mass after pemanasan.Ketika heated mercury oxide, mercury oxide produces oxygen gas so that its mass will berkurang.Lavoisier also proves the opposite. If a metal is heated in air, its mass will increase with the amount of oxygen taken from the air. Conclusion Lavoisiertersebut known as the law of conservation of mass (amount of substance before and sesudahreaksi unchanged).
Lavoisier explained the reason why mercury oxide Decreased mass. When it was heated, mercury oxide produced oxygen gas, so its mass was Decreased. Lavoisier also proved theopposite reaction. If a metal was heated in water, along with its mass Increased the number of oxygen taken from the water, Lavoisier conclusion is Called the law of conservation of mass (amount of matter Thetotal of the reaction compounds Remains constant).
Comparison of mass elements of Cu and O in the CuO compounds according to the results percobaanPercobaanKe-Before Heating (g copper) After the Warming (g copper oxide) Comparison of the mass of oxygen in copper oksida1 tembagadan 6.4
2
8.04
=
=
2
9,48 11,88
=
=
The mass of copper in copper oxide with copper mass sebelumpemanasan assuming all copper oxide reacts exhausted. Meanwhile, massaoksigen in the copper oxide is the difference between the mass of copper oxide dengantembaga.
The mass of copper in copper oxide is equal to the mass of copper before the heatingconsidering That React perfectly all copper. Whereas the mass of oxygen in copper oxide is thedifference the between the mass of copper oxide and copper
2
8.04
=
=
2
9,48 11,88
=
=
The mass of copper in copper oxide with copper mass sebelumpemanasan assuming all copper oxide reacts exhausted. Meanwhile, massaoksigen in the copper oxide is the difference between the mass of copper oxide dengantembaga.
The mass of copper in copper oxide is equal to the mass of copper before the heatingconsidering That React perfectly all copper. Whereas the mass of oxygen in copper oxide is thedifference the between the mass of copper oxide and copper
From his observation on mass proportion, Proust declared that the mass of each element which formed a compound has a definite proportion. It is called the law of definite proportion.
By using that law, we can predict the mass of element reacted, the mass of element left, and themass of the product.
3. The couple proportions law of oxygen gas and nitrogen gas can react to form more than one compound of nitrogen oxides. Based on the similarity of atomic oxygen and nitrogen, nitrogen oxide compounds can be grouped as follows
Oxygen and nitrogen gas can react to form more than one of nitrogen oxides. They are grouped as shown below The facts obtained show that when two elements can membentuklebih of one compound, and the mass of one element of the amount fixed, perbandinganmassa other elements will be compared as simple integers. Evidence is diamatipertama times by John
D
Alton and known by the name ganda.Sebenarnya comparative law, law of multiple comparisons is the development of atomic theory
D
altom, ie the atoms combine to form compounds, with the numbers and perbandinganyang round and simple The facts obtained PROVE That Pls two elements can form more than one compounds, and mass of one of its elements is constant, comparison of the other element Will be asimple mass ratio. It is first observed by John Dalton and Called as the couple proportions law. Actually, the couple proportions law is developes from Dalton atomic theory, that is if 2elements are Able to form more than one compound, in the which the mass of one of its elements isconstant, the proportion of other mass element has a simple ratio. If the weight of the composition of each pair of elements that can form more than one compound is known, we can use the law of multiple comparisons to determine the chemical formula of the compounds that terbentuk.If the weight composition of each pair can form more than one known compound, wecan use the Couple proportions law to determine the chemical formula of the product compounds.
D
Alton and known by the name ganda.Sebenarnya comparative law, law of multiple comparisons is the development of atomic theory
D
altom, ie the atoms combine to form compounds, with the numbers and perbandinganyang round and simple The facts obtained PROVE That Pls two elements can form more than one compounds, and mass of one of its elements is constant, comparison of the other element Will be asimple mass ratio. It is first observed by John Dalton and Called as the couple proportions law. Actually, the couple proportions law is developes from Dalton atomic theory, that is if 2elements are Able to form more than one compound, in the which the mass of one of its elements isconstant, the proportion of other mass element has a simple ratio. If the weight of the composition of each pair of elements that can form more than one compound is known, we can use the law of multiple comparisons to determine the chemical formula of the compounds that terbentuk.If the weight composition of each pair can form more than one known compound, wecan use the Couple proportions law to determine the chemical formula of the product compounds.
according to Lavoisier use. Law of Conservation of Mass, we can predict the masses of the elements react, the mass of the left element, and the mass of the product.
BalasHapusMy question, what is left of the mass elements and mass of products
it?? How do I know??