What Is a Mole Ratio Chemistry Definition and Example

In a chemical reaction, compounds react in a set ratio. If the ratio is unbalanced, there will be leftover reactant. To understand this, you need to be familiar with the molar ratio or mole ratio. Mole Ratio Definition A mole ratio is ​the  ratio between the amounts in moles of any two compounds involved in a chemical reaction. Mole ratios are used as conversion factors between products and reactants in many chemistry problems. The mole ratio may be determined by examining the coefficients in front of formulas in a balanced chemical equation. Also known as: The mole ratio is also called the mole-to-mole ratio. Mole Ratio Example: Balanced Equation For the reaction:2 H2(g) O2(g) → 2 H2O(g) The mole ratio between O2 and H2O is 1:2. For every 1 mole of O2 used, 2 moles of H2O are formed. The mole ratio between H2 and H2O is 1:1. For every 2 moles of H2 used, 2 moles of H2O are formed. If 4 moles of hydrogen were used, then 4 moles of water would be produced. Unbalanced Equation Example For another example, lets start with an unbalanced equation: O3 → O2 By inspection, you can see this equation is not balanced because mass is not conserved. There are more oxygen atoms in ozone (O3) than there are in oxygen gas (O2). You cannot calculate mole ratio for an unbalanced equation. Balancing this equation yields: 2O3 → 3O2 Now you can use the coefficients in front of ozone and oxygen to find the mole ratio. The ratio is 2 ozone to 3 oxygen, or 2:3. How do you use this? Lets say you are asked to find how many grams of oxygen are produced when you react 0.2 grams of ozone. The first step is to find how many moles of ozone are in 0.2 grams. (Remember, its a molar ratio, so in most equations, the ratio is not the same for grams.)To convert grams to moles, look up the atomic weight of oxygen on the periodic table. There are 16.00 grams of oxygen per mole.To find how many moles there are in 0.2 grams, solve for:x moles 0.2 grams * (1 mole/16.00 grams).You get 0.0125 moles.Use the mole ratio to find how many moles of oxygen are produced by 0.0125 moles of ozone:moles of oxygen 0.0125 moles ozone * (3 moles oxygen/2 moles ozone).Solving for this, you get 0.01875 moles of oxygen gas.Finally, convert​ the  number of moles of oxygen gas into grams for the answer:grams of oxygen gas 0.01875 moles * (16.00 grams/mole)grams of oxygen gas 0.3 grams It should be fairly obvious that you could have plugged in the mole fraction right away in this particular example because only one type of atom was present on both sides of the equation. However, its good to know the procedure for when you come across more complicated problems to solve.

Southwest Asia - 1009 Words

Southwest Asia is the term geographers’ use when referring to the Middle East. Middle East is a political term coined by the British in the 1930s to distinguish the region from both the Far East, which included China, Japan and Indochina, and the Near East, which included portions of Western Europe. All of these areas are truly only east of Europe. In order to emphasize a more global perspective, geographers prefer to use the politically neutral term Southwest Asia because it does not connote a Western European bias. [pic] Southwest Asia is consist of the following countries: 1. Armenia 2. Azerbaijan 3. Bahrain 4. Cyprus 5. Georgia 6. Iraq 7. Israel 8. Jordan 9. Kuwait 10. Lebanon†¦show more content†¦In English, kebab with no qualification generally refers more specifically to shish kebab served on the skewer. 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Han vs Roman Attitudes Toward Tech Free Essays

Kimberly Giron AP World history September 27, 2012 World History DBQ Han society had positive attitude towards technology as some saw it as beneficial to society and others considered it a gift. Roman society had more of a supportive yet demeaning attitude towards technology. There is no doubt that things that benefit people and gift are considered positive. We will write a custom essay sample on Han vs Roman Attitudes Toward Tech or any similar topic only for you Order Now A Han government official (Document 1) wrote to local officials in order to advise them on how to use their technology to prevent floods, showing his interests in maintaining the empire so that it doesn’t fall. Not only that, Han Guan, another government official (Document 2) goes against the way the government is monopolizing the making of technology and that technology should be made by the people, since government made technologies are brittle and costing the government more money as not much salt is being produced. It is very interesting that an official would speak against the government, but it may be due to the fact that the scarcity of salt is costing this official money. Both officials may also be looking to maintain their positions or get higher ones once the emperor sees how well they are looking after the empire, which can only be maintained with the help of technology. Others in Han society consider technology as a gift from enlightened leaders. Huan Tan, an upper-class philosopher (document 3) mentions that Fuxi invented some technology which was efficient and beneficial to society. Fuxi, is said to be a wise enlightened emperor which means that since Fuxi made it, it is no doubt a great gift. There is also some government sponsored history (Document 4) which characterizes Tu Shih as a just and commoner loving man who developed technology in order lift some of the burden of labor off the people. Technology was Tu Shih’s gift to the people and Tu Shih, was considered a Fuxi. Therefore this government sponsored historian also considers technology a gift. Roman attitude towards technology was that is was necessary but that it didn’t take much intelligence to make such technology, or in other words, a demeaning attitude. Cicero, an upper-class politician leader (Document 5), considered technology as something for vulgar common folk,not gentlemen. He believed that skill wasn’t required to use such thing but, he never mentioned that technology was useless. Seneca, a philosopher and adviser (Document 7) also believed that it doesn’t take brains to come up with technology but never attacks it’s use in society as he sees that it doesn’t matter who made it, but its use that matters. Their attitude must be influenced by the fact that technology was made by the lower class and acknowledging lower class work would mean lowering their pride. Other Roman attitudes were that technology was needed to create beauty. Frontius, a Roman general (Document 8) gives a glowing report on how beautiful technology has been able to make the empire’s aqueducts, far more superior than structures in Greece and Egypt. Plutarch, a high official in Rome (Document 6) gives another positive report on the beauty of Roman roads created by Gaius Gracchus which was built with the help of their technology. Therefore, technology is practical, is essential for making things beautiful, but looked down upon as it is used by the lower class. Despite the different societies, it is clear that in each empire government officials and upper-class philosophers tend to share attitudes towards technology. It would be interesting to see the attitudes of common workers and women towards technology as they are the ones who make more use of it. Workers may be most affected by technology as they are the ones whom upper-class Romans consider to be the vulgar people who work with it and brainless people who invent it. In Han societies they would be the ones who produce the salt and also need the protection given by technology. The opinions of women would also provide information on how women were involved in technology and how it affected gender roles. The documents above only provide a view for one class in each society therefore not giving a clear overall attitude on technology in each society. How to cite Han vs Roman Attitudes Toward Tech, Essay examples