Simplest Formula From Percent Composition

This is a worked example chemistry problem to calculate the simplest formula from the percent composition. Simplest Formula from Percent Composition Problem Vitamin C contains three elements: carbon, hydrogen, and oxygen. Analysis of pure vitamin C indicates that the elements are present in the following mass percentages: C 40.9H 4.58O 54.5 Use the data to determine the simplest formula for vitamin C. Solution We want to find the number of moles of each element in order to determine the ratios of the elements and the formula. To make the calculation easy (i.e., let the percentages convert directly to grams), lets assume we have 100 g of vitamin C. If you are given mass percentages, always work with a hypothetical 100-gram sample. In a 100 gram sample, there are 40.9 g C, 4.58 g H, and 54.5 g O. Now, look up the atomic masses for the elements from the Periodic Table. The atomic masses are found to be: H is 1.01C is 12.01O is 16.00 The atomic masses provide a moles-per-gram conversion factor. Using the conversion factor, we can calculate the moles of each element: moles C 40.9 g C x 1 mol C / 12.01 g C 3.41 mol Cmoles H 4.58 g H x 1 mol H / 1.01 g H 4.53 mol Hmoles O 54.5 g O x 1 mol O / 16.00 g O 3.41 mol O The numbers of moles of each element are in the same ratio as the number of atoms C, H, and O in vitamin C. To find the simplest whole number ratio, divide each number by the smallest number of moles: C: 3.41 / 3.41 1.00H: 4.53 / 3.41 1.33O: 3.41 / 3.41 1.00 The ratios indicate that for every one carbon atom there is one oxygen atom. Also, there are 1.33 4/3 hydrogen atoms. (Note: converting the decimal to a fraction is a matter of practice! You know the elements must be present in whole number ratios, so look for common fractions and become familiar with the decimal equivalents for fractions so you can recognize them.) Another way to express the atom ratio is to write it as 1 C : 4/3 H : 1 O. Multiply by three to obtain the smallest whole-number ratio, which is 3 C: 4 H : 3 O. Thus, the simplest formula of vitamin C is C3H4O3. Answer C3H4O3 Second Example This is another  worked example chemistry problem to calculate the simplest formula from the percent composition. Problem The mineral cassiterite is a compound of tin and oxygen. Chemical analysis of cassiterite shows that the mass percentages of tin and oxygen are 78.8 and 21.2, respectively. Determine the formula of this compound. Solution We want to find the number of moles of each element in order to determine the ratios of the elements and the formula. To make the calculation easy (i.e., let the percentages convert directly to grams), lets assume we have 100 g of cassiterite. In a 100 gram sample, there are 78.8 g Sn and 21.2 g O. Now, look up the atomic masses for the elements from the  Periodic Table. The atomic masses are found to be: Sn is 118.7O is 16.00 The atomic masses provide  a moles-per-gram conversion factor. Using the conversion factor, we can calculate the moles of each element: moles Sn 78.8 g Sn x 1 mol Sn / 118.7 g Sn 0.664 mol Snmoles O 21.2 g O x 1 mol O / 16.00 g O 1.33 mol O The numbers of moles of each element are in the same ratio as the number of atoms Sn and O in cassiterite. To find the simplest whole number ratio, divide each number by the smallest number of moles: Sn: 0.664 / 0.664 1.00O: 1.33 / 0.664 2.00 The ratios indicate that there is one  tin atom for every two  oxygen atoms. Thus, the  simplest formula  of cassiterite is SnO2. Answer SnO2

Difficult Dialects Pennsylvania Dutch Essay example

Pennsylvania Dutch is one of the hardest dialects to study, and yet has an extremely interesting history as well as a significant impact on the English language of the Pennsylvania area. Study of Pennsylvania Dutch is difficult for researchers because of the scarcity of books printed in it. The language had been preserved largely by word of mouth and lacks a traceable history through written works, making it difficult to trace its development (Follin, 1929, p. 455). However, what there has been much research on is how it differs from modern German, also called High German, and also how Pennsylvania Dutch and English have mutually affected each other. Researchers can even tell which dialects Pennsylvania Dutch evolved from and whence†¦show more content†¦They used their particular dialect in everyday discourse with others from the same area, and they also knew High German so that they could interact with each other as well as in schools and churches. Soon after immigrati ng to Pennsylvania, many of these settlers had to become trilingual due to the transition from German to English in schools. Due to the prominence of both the English and High German languages, the minor dialects evolved into one dialect, one that was very similar to the Palatinate dialect because most settlers were from that area, and this formed what we now call the dialect of Pennsylvania Dutch, which has not changed much at all over the past hundred years (Buffington, A.F., 1956, p. 317). Not only is Pennsylvania Dutch a conglomeration of cultures with roots in many different geographical areas, it is part of a culture is also rich in religious traditions (Tolles, F.B., 1957, p. 130). The two major religious groups that make up the speakers of Pennsylvania Dutch are the Amish and the Mennonites, also called the sectarians and non-sectarians respectively (Fuller, J.M., 1996, p. 500). Approximately 100,000 Pennsylvania Dutch speakers are Amish, amounting to nearly one-third of the Pennsylvania Dutch population. There are also approximately 10,000 Mennonites, not including children (Moelleken, W.W., 1983, p. 174-175). The Amish and Mennonites broke into two slightly different communities of Pennsylvania Dutch. Their language differsShow MoreRelatedHow ELT Has Helped Make English the Global Language2531 Words   |  10 Pagesï » ¿How ELT has Helped Make English the Global Language Standardization of English Controversies It is not difficult to determine why English began its rise as the predominant language in the world. Britain, the progenitor of the language, once bragged that the Sun never set on the British Empire. This is true in that the empire stretched to all areas of the globe, and the nation of England had influence beyond just its possessions. 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Religion, Poverty and Wealth Free Essays

All Christians believe that the world and everything in it have been created by God. They believe that the world is holy, special, divine, worthy of respect and honour. ‘The earth is the Lord’s, and everything in it, the world, and all who live in it; for he founded it upon the seas and established it upon the waters. We will write a custom essay sample on Religion, Poverty and Wealth or any similar topic only for you Order Now ‘ Psalm 24:1-2 Because ‘the earth is the Lord’s’, Christians believe they are stewards or caretakers. They should be committed to the proper management of the world and its resources. Since the earth has been delegated to people by God they have to manage it esponsibly and productively for the sake of both their own and subsequent generations. The following bible quotes tell us that everything belongs to God. God made the mountains, the sea, dry land and the skies. They also show that God’s creation reveals his greatness: ‘For the Lord is the great God ¤Ã¢â‚¬Å¡Ã‚ ¬: In his hand are the depths of the earth, and the mountain peaks belong to him. The sea is his, for he made it, and his hands form the dry land’ Psalm 95:3-6 Christianity teaches us that God is the God of nature, as well as of religion. God made the physical universe, sustains it, and still pronounces it good. God is interested in, nd looks after his creation. ‘God saw all that he had made, and it was very good. ‘ Genesis 1 Christians believe that God made human beings to be like himself. ‘So God created man in his own image ¤Ã¢â‚¬Å¡Ã‚ ¬: male and female he created them. God blessed them and said to them, be fruitful and increase in number, fill the earth and subdue it. Rule over the fish of the sea and the birds of the air and over every living creature that moves on the ground. Genesis 1:27-28 Human beings are godlike beings made in Gods likeness and possessing capacities which distinguish them from the animal creation. Since God is interested in the arth, so should the Christian want to care for all that God has made. God tells man to look after the earth and Christians believe they have a responsible task in God’s plan for creation. God tells man they should care for the world and Chri stians believe that they should look atter it because ne nas given it to them. Theretore they should respect it and protect it. As well as caring for the earth, Jesus taught his followers to love God with all their heart, and to love their neighbours as themselves. In Matthew 19:16-21 Jesus told a rich, young man that if he wanted eternal life he should love his neighbour as imself, which included selling his processions and giving to the poor. Love of God cannot be separated from love for humanity. Christians try to live their lives by this rule. Christians believe they should take what they say and sing in church, in to their everyday lives, so that it affects all of their life, at home, work, school etc. Religion that God our Father accepts as pure and faultless is this: to look after orphans and widows in their distress. ‘ James 1:27 Christians should truly love their neighbours and should be concerned for their total welfare: the well being of their soul, their body, and their community. Christians look to Jesus for an example for their lives. Jesus humbled himself and became weak and vulnerable to serve people. He healed the sick, feed the hungry and was a friend to the dropouts. He said he did not come to be served but to serve. Therefore if the Christian models his or her life on Jesus, it will involve entering into other people’s worlds. Jesus was moved with compassion by the sight of needy human beings and Christians follow this example. Faith and love go together for Christians: ‘Faith by itself if it is not accompanied by action is dead ¤Ã¢â‚¬Å¡Ã‚ ¬:l will show you my faith by what I do. ‘ James 2:17-18 This implies that the Christian should show their faith by loving and serving others. ‘If anyone has material possessions and seize his brother in need but has no pity on him, how can the love of God be in him. 1 John 3:17 These verses give an example of how Christians should lay down their lives for others – to help those in need. When Jesus was asked to define what he meant by ‘neighbour’, he told the well known parable of the good Samaritan which is found in Luke chapter 10. Jesus paints the scene of a man lying mugged by the side of a road. Two kind of r eligious leaders, a priest and a Levite pass him without stopping. The audience expect a third person to come by and help the victim who will be an ordinary layman, a fellow Jew. But Jesus surprises them. The third man is a Samaritan, an enemy. Jesus shows that loving your neighbour means acting when you meet a person in need, even it it is an enemy or an inconvenience to you. Jesus tells the people not to sit about debating who counts as your neighbour but to go out and be a good neighbour as the need arises. Christians believe that their neighbour is not Just the person who looks like them, but people of all races throughout the world who are all bound together in the human family. Jesus bases this love for enemies on the example of God. As the creator God, involved with every detail of the universe, he does not discriminate between deserving and undeserving human beings. How to cite Religion, Poverty and Wealth, Papers