How Much Co2 Lab Essay Example for Free

How Much Co2 Lab Essay Experimental: An Alka-Seltzer tablet was accurately weighed and recorded using a weighing boat and analytical balance. A fragmented piece between 0. 2100g and 0. 2800g was also weighed and recorded. 500mL of water was placed in a 600mL beaker. 80mL of water was then mixed with 20mL of 6M HCl in a 150mL beaker to create 1. 2M HCl. A 1. 5g piece of Alka-Seltzer tablet was then added to the HCl solution. After complete evolution of CO2, gravity filtration was used to catch all of the starch produced from the reaction. The buret was filled with the filtrated solution and the glass tube end of a rubber tube was inserted about 2 inches into the mouth of the buret. While keeping a finger over the buret mouth, the entire buret was quickly inverted and the tubing and mouth completely submerged into the water in the 600mL beaker. The buret was then clamped into place while double checking the buret mouth was under the water level and the rubber tubing was not pinched. The stopcock was then opened extremely slowly until the water level in the buret dropped close to the 50. 00mL mark. This level was then recorded. 25mL of the prepared HCl solution was added to a 125mL Erlenmeyer flask, along with a 0. 5-1. 0g piece of Alka-Seltzer tablet. After complete evolution of CO2, the neck of the flask and rubber stopper were completely dried. The tablet fragment earlier weighed (between 0. 21-0. 28g) was then added to the flask followed by immediate insertion of the stopper to ensure a tight seal. 5 minutes after the CO2 has been generated, the new water level of the buret was recorded, along with the distance in inches between the buret and beaker’s water levels. Lastly, the prevailing atmospheric pressure, temperature of the water, and approximate volume of the room was recorded. Results and Calculations Table 1 Experimental Values Experimental Values| Measurements| Current pressure of the room| 29. 3 in. Hg| Mass of entire tablet| 3. 2545 g| Mass of fragment| 0. 2524 g| Buret water level (start)| 45. 62 mL| Buret water level (end)| 7. 50 mL| Distance between buret and beaker water level| 3. 625 inches| Temperature of the water/room| 21. 8Â °C| Pressure of water at 21. 8Â °C| 19. 587 torr| Length, width, height of the room| 1463cm, 792cm, 366cm | Conversions: Temperature of the Room: 21. 8Â °C + 273. 15 = 294. 95K Volume of the room: (l? w? h) = (1463cm)(792cm)(366cm) = 424 x 108 cm3 = 424073L Pressure of room: 29. 3 in. Hg x 760 mmHg x 760 torr = 744. 3 torr 29. 92 in. Hg 760 mmHg 29. 3 in. Hg x 1 atm = 0. 97927 atm 29. 92 in. Hg Calculations: PÂ °atm = Patm – ( in. of H2O )( 1. 87 torr/in. of H2O ) = (744. 3 torr) – (3. 625 in. )(1. 87 torr/in. ) = 737. 521 torr PCO2 = PÂ °atm – PH2O = (737. 521 torr) – (19. 87 torr) = 717. 934 torr x 1 atm = 0. 94465 atm 760 torr VCO2 = 45. 62mL – 7. 50mL = 38. 12mL = 38. 12mL x (1L/1000mL) = 0. 03812 L NCO2 = PCO2VCO2/RT = ( 0. 94465atm )( 0. 03812L ) = 0. 0014873 mol CO2 ( 0. 08206 L? atm/mol? K )(294. 95 K) Moles of CO2 one tablet produces: (moles CO2) x (mass tablet/mass fragment) = (0. 0014873 mol CO2) x (3. 2545g / 0. 2524g) = 0. 019178 moles CO2 in tablet Moles of the room: Nroom = ProomV room/RT = (0. 9727atm)(424073L)/(0. 08206 L? atm/mol? K )(294. 95 K) = 17,042. 7 moles in room of tablets required to fill room: (moles of room) / (moles of CO2 per tablet) = (17,042. 7 moles) / (0. 019178 mol CO2) = 8. 887 x 105 tablets Mass of NaHCO3 needed to fill room with CO2: = 8. 887 x 105 tablets x 0. 019178 moles CO2 x 1 mol NaHCO3 x 84. 01g NaHCO3 1 tablet 1 mol CO2 1 mol NaHCO3 = 1. 432 x 106 g NaHCO3 Discussion In order to find the number of tablets needed to produce enough CO2 to fill the room, the ideal gas law was required first to solve for the number of moles of CO2 in one tablet and second the number of moles of the room. To use the ideal gas law, the atmospheric pressure was adjusted for due to the lower pressure in the buret when compared to the outer atmospheric pressure. This unequalization of pressures, although corrected, may still be slightly off, thus potentially causing later calculation error when using the ideal gas law to solve for the moles of CO2. Difficulties in the experiment arose when inverting the buret and completely submerging it into the beaker of water. This is a likely place for error because keeping a finger over the mouth of the buret and sealing the mouth tightly enough during the inverting process was very difficult. If too much of the solution inside the buret leaked out, one would not have enough volume to start with (before the CO2 evolution) and thus would have to remake the solution and repeat the process. Another potential source of error would be the measurement of the size of the room. With so many objects (lab tables, carts, ceiling structures) that also occupy the space, it was very difficult to determine an accurate volume of the room. Thus, the actual number of tablets required to fill the room might be a little bit less when the objects taking up space in the room are considered. Additionally, if the gravity filtration failed to filtrate all of the starch from the HCl solution, the leftover starch could potentially cause a problem in the reaction when the tablet fragment is added to the solution, thus providing more possible sources of error. Another minor source is the sensitive nature of the analytical balance, possibly leading to incorrect weight measurements of the tablet fragments. Another is general human error, such as reading the volume on the buret when determining the amount of CO2 evolved from the fragment. Conclusion In conclusion, the overall experiment proved to be successful; depending on the calculated size of the room, the number of Alka-Seltzer tablets required to produce enough CO2 gas to fill it was able to be determined. The mass of NaHCO3 needed to produce enough CO2 was also able to be calculated due to the fact that one mole of NaHCO3 is equal to one mole of CO2. Using the ideal gas law, Dalton’s law of partial pressure, stoichiometry, and conversions, a result was calculated, thus proving that future experiments dealing with the calculation of CO2 evolved from Alka-Seltzer by using an inverted buret can be done successfully.

Selfishness in Ywain the Knight of the Lion Essay -- Ywain the Knight

Selfishness in Ywain the Knight of the Lion In Chretien de Troyes' Ywain the Knight of the Lion, there appears a substantial amount of writing about noble men and women, and noble deeds. These noble acts consist of knights coming to a maiden's aid, regardless of the circumstances, and pravailing in battles in which they are either hopelessly outnumbered, or seemingly outstrengthed. Chretien's romance about Ywain also stresses a love that takes a man prisoner, a love for which man or woman would surely die for, and in which one loves another more than himself. The ep itomes of these characteristics seem to be Ywain and Laudine. However, Ywain and Laudine are both driven by selfishness. Selfishness in love is evident in both Laudine, and Ywain. However it is more prominent with L audine, simply because much of what is written about her in the story has to do with love, and although love is emphasized a great deal with regard to Ywain, more is written about his fighting evil, and assisting those in need of his strengt h an d courage. Saying that Laudine is selfish in love means, at its root, that she uses it to enhance her own welfare. This is first evident, when she finally realizes that she must find someone to protect her people, her spring, and herself. Lu nette convinces her to take the knight who killed her husband as her new groom, and right away Laudine wants to know about the "name, the rank, and the family of the knight"(30). Then when she finds out that he is actually the distinguished Ywain, she becomes incredibly excited, and wishes him there as fast as humanly possible, or faster. Laudine has no idea of what he is like, but because he is so well-known and strong she will love him. This "love" f... ...ined in "love." Chretien writes about them that, "he was loved and held dear by his lady, and she was loved by him" (113). It is impossible to believe this statement, but that is what Chretien wants. It is also written in the conclusion that Ywain will never "visit any wrong" on his wife again (113). This is just one more statement that insults the intelligence of the reader, because as we have already learned, a man is of no use if he is not repeatedly proven in battle. Chances are Ywain will run off again as soon as Gawain puts pressure on him to do so. This ends the story with two fallacies that Chretien expects to be believed in spite of all the evidence he gives otherwise. Works Cited: Troyes, Chretien de. Ywain: The Knight of the Lion. Trans. Robert W. Ackerman, Frederick W. Locke and Carleton W. Carrol. [City,] Illinois: Waveland Press, 1992. Selfishness in Ywain the Knight of the Lion Essay -- Ywain the Knight Selfishness in Ywain the Knight of the Lion In Chretien de Troyes' Ywain the Knight of the Lion, there appears a substantial amount of writing about noble men and women, and noble deeds. These noble acts consist of knights coming to a maiden's aid, regardless of the circumstances, and pravailing in battles in which they are either hopelessly outnumbered, or seemingly outstrengthed. Chretien's romance about Ywain also stresses a love that takes a man prisoner, a love for which man or woman would surely die for, and in which one loves another more than himself. The ep itomes of these characteristics seem to be Ywain and Laudine. However, Ywain and Laudine are both driven by selfishness. Selfishness in love is evident in both Laudine, and Ywain. However it is more prominent with L audine, simply because much of what is written about her in the story has to do with love, and although love is emphasized a great deal with regard to Ywain, more is written about his fighting evil, and assisting those in need of his strengt h an d courage. Saying that Laudine is selfish in love means, at its root, that she uses it to enhance her own welfare. This is first evident, when she finally realizes that she must find someone to protect her people, her spring, and herself. Lu nette convinces her to take the knight who killed her husband as her new groom, and right away Laudine wants to know about the "name, the rank, and the family of the knight"(30). Then when she finds out that he is actually the distinguished Ywain, she becomes incredibly excited, and wishes him there as fast as humanly possible, or faster. Laudine has no idea of what he is like, but because he is so well-known and strong she will love him. This "love" f... ...ined in "love." Chretien writes about them that, "he was loved and held dear by his lady, and she was loved by him" (113). It is impossible to believe this statement, but that is what Chretien wants. It is also written in the conclusion that Ywain will never "visit any wrong" on his wife again (113). This is just one more statement that insults the intelligence of the reader, because as we have already learned, a man is of no use if he is not repeatedly proven in battle. Chances are Ywain will run off again as soon as Gawain puts pressure on him to do so. This ends the story with two fallacies that Chretien expects to be believed in spite of all the evidence he gives otherwise. Works Cited: Troyes, Chretien de. Ywain: The Knight of the Lion. Trans. Robert W. Ackerman, Frederick W. Locke and Carleton W. Carrol. [City,] Illinois: Waveland Press, 1992.

The Minutemen and Their World

Robert A. Gross in his book, â€Å"The Minutemen and Their World†, takes a nearer look at the American Revolution by investigating the lives of the people that exist in Concord, Massachusetts. By exploring and understanding court records, diaries, colony records, families’ trees, and private papers the writer begins to illustrate a civilization prior, during, and subsequent to the American Revolution.He in addition succeeds in producing an excellent written chronological text that is simple to read, understand, and enjoy. It can be thought that Gross achieves this by providing the reader an enhanced sense of the living of a person in the period of the American Revolution. As well, the writer provides the true information that not only were the people of Concord experiencing a Revolution to battle for their autonomy, but they were furthermore undergoing economic, social, agricultural, and religious revolutions.Prior to the Revolution, Concordians were living in their own world, symbolically and accurately speaking. The social order of Concord was well developed and controlled issues domestically. These problems hampered with the daily social and economic environment. For instance, relationships between parents and their children were deteriorating. Also, the soil was being used up for the reason of excessive farming which led to the problem of too man sons and not enough land to be divided up between them.The generation gap between social classes was also broadening and political offices were held by a privileged few which were passed down almost as an inheritance through families. These domestic problems were temporarily put on hold with the appearance of the characteristic of a Revolution. The harmony necessary to conquer the reliance by the British Crown was much more significant to the people of Concord than their somewhat small problems and bickering. The most important feature behind the people's determination to stay free was that they desir ed to preserve and defend their traditional life, on the other hand by combating to protect that life, Gross would point out that the Concordians in consequence opened themselves to change.The mainly convincing argument Gross makes reveals the loss of patriarchal control in Concord, and apparently across the colonies. He portrays the manners sons rely on fathers for land, and daughters depend on fathers for dowries. As the financial environment changes, dowries are condensed, local fruitful land turn out to be limited and mature children have enticements to leave the relatives to trail the frontier. This outlays the father his basis of labor and outlays the children the resource of heritage and constancy.The changes the Revolution had on the people of Concord were the building blocks of the democratic society as one recognizes it today. By joining together to depose the crown the people of Concord defeat the â€Å"barriers of residence and wealth†(61). Men in all positions of the society desired to defend their freedom, consequently after the Revolution the severe rules relating to the elitist model of government in Concord seldom existed.Gross points out that after the Revolution the â€Å"newly elected delegate† was sent a â€Å"strict set of rigid rules† for him to follow â€Å"in court†(163). With new prominence placed on the people and their rights, politics was hardly ever about religious status any longer but more about equal representation. Also, after the revolution, Gross indicate that by 1790 there are no slaves in Massachusetts. With the Concordians fighting for their autonomy in the Revolution, it would be archetypal for the Concordians to see enslavement of any persons as hypocritical; when that is the very thing they were fighting against.Agriculture also was alleviating by restructuring and intensive farming. This resulted in a better-off social life and landscape. In general, the competition between generations was declined and sons continued with their families instead of moving away. All things considered, a better-off economic and social approach developed the people of Concord after the Revolution, though not right away.Robert Gross carried out a marvelous quantity of research to uncover information about persons whose names and achievements have long since been elapsed by the world, but he enlightens their tale so systematically that he permits the reader to overlook what a demanding assignment he took upon himself. With the closer look at Concord, Gross means to symbolize Concord as a representation of an ordinary colonial settlement during the Revolution. The characters in the book provide the reader logic of why the people in this town opted to rebellion. By representing the people of Concord and their causes to battle, Gross efficiently signifies all of the colonies that battled in the Revolution; as Gross describes the Concord fight as a happening in a wider war.The Minutemen and The ir World was ground-breaking in personalizing a Revolution. The author prolonged past proceedings and statistics into a persuasive account of people both normal and great. The points of view are concrete due to the heavy quantitative research. Works CitedGross A. Robert, (April 30, 2001), The Minutemen and Their World, Hill and Wang; 25th Ann edition, IS

The Gothic Villain Essay - 942 Words

The Gothic Villain Who is the Gothic Villain? Is he a villain/hero? Is he a dangerous lover? The villain is usually dark and handsome, though he might have some tell-tell sign that warns he is wicked. The villains ranged from dark priests to mysterious bandits. Some start out as heroes but turn into villains. The Gothic villain has several identifying characteristics. They are shifty, cunning and can mold their behavior to match the need of the circumstance. Villains will utilize intimidation, deception, and even flattery to attain their objective. So, who is the villain-hero? This villain may start out at the beginning of the story as a hero, or he may possess heroic characteristics, such as charisma, or he may have a†¦show more content†¦By undermining typical principles of the Gothic hero (William Harding), Faber tricks his arbitrators into feeling sympathy for him, a deception that makes him much more calculating and undermining than conventional Gothic villains† (Jett). Poe is greatly inspired by Simmss Martin Faber, so much so that this villain is the basis for ‘William Wilson.’ â€Å"Many similarities exist between the two. Both Simmss Faber and Poes Wilson self-condemn their sinister deeds and must confront their conscious minds, represented by Gothic double figures† (Jett). These ‘doppelgangers’ are the villains conscious. For instance, Martin’s doppelganger is his friend William Harding. William is responsible for â€Å"bringing Martin to justice for the murder of Emily Andrews† (Jett). Wilsons doppelganger is a schoolmate who has his same name and challenges him whenever he gives into his evil side. Their selfish needs motivate Faber and Wilson. â€Å"However, the major difference between the two centers on Wilsons inability to express guilt over his sins and Fabers perpetual need to confess his. 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