How to Find the Molecular Mass of a Compound

The molecular mass or molecular weight is the total mass of a compound. It is equal to the sum of the individual atomic masses of each atom in the molecule. Its easy to find the molecular mass of a compound with these steps: Determine the molecular formula of the molecule.Use the periodic table to determine the atomic mass of each element in the molecule.Multiply each elements atomic mass by the number of atoms of that element in the molecule. This number is represented by the subscript next to the element symbol in the molecular formula.Add these values together for each different atom in the molecule. The total will be the molecular mass of the compound. Example of Simple Molecular Mass Calculation For example, to find the molecular mass of NH3, the first step is to look up the atomic masses of nitrogen (N) and hydrogen (H). H 1.00794N 14.0067 Next, multiply the atomic mass of each atom by the number of atoms in the compound. There is one nitrogen atom (no subscript is given for one atom). There are three hydrogen atoms, as indicated by the subscript. molecular mass (1 x 14.0067) (3 x 1.00794)molecular mass 14.0067 3.02382molecular mass 17.0305 Note the calculator will give an answer of 17.03052, but the reported answer contains fewer significant figures because there are six significant digits in the atomic mass values used in the calculation. Example of Complex Molecular Mass Calculation Heres a more complicated example: Find the molecular mass (molecular weight) of Ca3(PO4)2. From the periodic table, the atomic masses of each element are: Ca 40.078P 30.973761O 15.9994 The tricky part is figuring out how many of each atom are present in the compound. There are three calcium atoms, two phosphorus atoms, and eight oxygen atoms. How did you get that? If part of the compound is in parentheses, multiply the subscript immediately following the element symbol by the subscript that closes the parentheses. molecular mass (40.078 x 3) (30.97361 x 2) (15.9994 x 8)molecular mass 120.234 61.94722 127.9952molecular mass 310.17642 (from the calculator)molecular mass 310.18 The final answer uses the correct number of significant figures. In this case, its five digits (from the atomic mass for calcium). Tips for Success Remember, if no subscript is given after an element symbol, it means there is one atom.A subscript applies to the atom symbol it follows. Multiply the subscript by the atoms atomic weight.Report your answer using the correct number of significant figures. This will be the smallest number of significant figures in the atomic mass values. Watch rules for rounding and truncating, which depend on the situation.

Village Life vs City Life Free Essays

It is a firm belief on the part of people that there is a big difference between village life and city life. It is absolutely true that the life in a village and that in a city varies so much that the difference is glaring at times. In fact it can very well be said that people living in cities are different from people living in villages. We will write a custom essay sample on Village Life vs City Life or any similar topic only for you Order Now It is normal feeling amongst us that city life is more enjoyable than village life. It is only an assumption. City life is endowed with a lot of advantages. This is because of the fact that there are a number of opportunities open to you in a city. City life is provided with a lot of facilities too. You would not find many facilities and opportunities in a village. Parents would be happy to send their children to cities for higher studies rather than to villages. Cities are endowed with quality higher education institutions whereas villages are not endowed with high quality colleges and universities. In addition to schools and colleges, city life is preferred for improved medical facilities. If someone falls ill in the family, you tend to take him or her to a popular hospital in a city since villages are not equipped with the best of medical attention. The number of hospitals in a city and the facilities are far more when compared to that in a village. A city has banks, cinema theaters, parks, golf courses, sports stadiums, clubs, hostels and shopping malls. The behavior of people in a city is different from that of the people in a village. People in a city are generally unfriendly and they maintain distant from others. The people in villages on the other hand are warm-hearted and friendly. Villagers receive you well where as city-dwellers tend to be within doors. People in villages are very helpful in nature whereas people living in cities tend to be more selfish in their attitude. A city is characterized by various kinds of pollution such as noise pollution, visual pollution and air pollution. This is due to that fact that there a number of factories, industries and mills in a city than in villages. Hence villages are endowed with pure air devoid of pollution. Visual and noise pollution are also less in villages. Since village life is calm and quiet and bereft of pollution of any kind, older people tend to settle down in villages after their retirement from service How to cite Village Life vs City Life, Essays

Three Qualities an Authority Figure Should Posses free essay sample

Mohammed Al Shahoumi American University of the Middle East Mohammed S. Al- Shahoumi ENL 110 – UM1 12797 17 March 2013 Learning a Foreign Language One of my biggest goals in life is to learn a foreign Language. In fact it is my dream to experience life through talking to other people in a language that is different to mine. But learning a foreign language takes time and dedication. Throughout my research I found out that’s the best age is to learn a foreign language is from three to nine years old. There are many challenges to learn a foreign language. The question is why learn a foreign language. Many languages differ in pronunciation which makes some languages easier than others. For many people learning a foreign language is a challenge because they maybe use it in work, travel, family/friends, study, required course, food or as a secret language. There are three methods of learning a foreign language; reading, writing, listening. We will write a custom essay sample on Three Qualities an Authority Figure Should Posses or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page In some jobs it involves you talking to speaker of a foreign language, being able to talk to them in their own languages will help you to communicate with them easily and gain there respect fast. Speaking a foreign language can also help you to make more sale and to negotiate more efficiently and to gain a contractor. Knowledge of foreign languages may also increase your chances of finding a new job when you are trying to find a job abroad, or for a business meeting abroad. If you have some friends or relatives that can speak a language that not many people can speak or understand, you can talk freely in public and have no fear of anyone next to you of understanding what you are saying. Also you can write on a paper where no one will understand what are you saying. This foreign language can be used as a secret language. Traveling to a foreign country sometimes you need to have a basic knowledge of their language because if you want to know directions to a specific place or to get to know some local people. Learning there anguage will help you to order food and drink, find your way around, get tickets. The more knowledge you have of their foreign language, you can get into real conservations with local people. This will add more fun to your holiday. \ Learning a foreign language is for fun. Perhaps to you it seems boring (a lot of people I know couldnt stand doing French in high school). However, it gives people a little challenge. Something to do. When you learn how to communicate fluently in a foreign language, it is quite a rewarding experience to use this language to the people who speak it and actually be understood.

A Separate Peace

A Separate Peace Grace UnderhillMrs. MatoneEnglish 9H-F3 October 2013In a Separate Peace, John Knowles suggests that Devon is a microcosm of the world at that time. a microcosm is a smaller version of a larger world. For example, John Knowles suggests this is through the boys jumping off the tree, which was sometimes used a form of training for the war. In addition, the boys at Devon have enemies just as there are in war. Finally, the ultimate goal in war is peace, which the boys search for throughout the book.To begin with, jumping out of a high tree is a form of training for the upperclassmen, the seniors. Gene explains this type of training on page 15 as "The class above, seniors were caught up in a physical hardening regimen, which included jumping from this tree." In the beginning of the book Gene and Finny creates a club that members would jump from this tree every night, the Super Suicide Society of the Summer Session.In this club, every night the members woud meet to jump out of the tree. To be on this club you had to jump from the tree and the leaders, Gene and Finny, would jump first. Also, Finny refers back to jumping out of the tree as a form of training when he was talking to Mr. Prud'homme on page 22 "The real reason, sir, was that we just had to jump out of that tree We had to do that naturally because we're all getting ready for the war."Another way Devon is a microcosm is just like there are enemies in war, there are many enemies at Devon. These enemies aren't all between two different people, a multitude of them are between people and themselves. One example of...

Theodore Roosevelt2 essays

Theodore Roosevelt2 essays Theodore Roosevelt was the twenty-sixth president of the United States. He served in office from 1901 to 1909. With the assassination of President McKinley, Roosevelt, not quite 43, became the youngest President in the Nations history. Roosevelts youth was very different from most of the other Presidents. He was born in New York City in 1858 into a wealthy family. His life was plagued early on by health problems and illness which he overcame. The conquering of his ill health led to Roosevelt supporting a strenuous lifestyle. In 1884, his first wife, Alice Lee Roosevelt, and his mother died on the same day. Following their deaths, Roosevelt spent two years on his ranch in the Dakota Territory. At his ranch, he spent his time driving cattle, big game hunting and even captured an outlaw. During a trip to London, England, he married Edith Carow in December 1886. Roosevelt was a lieutenant colonel in the Rough Rider Regiment during the Spanish- American War. He was one of the most remembered heroes of the war, leading a charge at the battle of San Juan. In 1898, Roosevelt was accepted as the Republican candidate for governor of New York State. He won the election and served as governor with distinction. He was elected as President in 1901 and served until 1909. Roosevelt was responsible for many great achievements during his tenure as President. He believed in fairness and justice while favoring no one over anyone else. Known vibrantly as a trust buster, Roosevelt forced a dissolution of a great railroad combination in the Northwest with more antitrust suits following under the Sherman Act. He was also responsible for the construction of the Panama Canal, the establishment of the U.S. right of intervention in Latin America, the prevention of foreign bases in the Caribbean, and numerous achievements i ...

How could Dunn institutionalize the change once it is in place Assignment - 1

How could Dunn institutionalize the change once it is in place - Assignment Example To ensure the changes were instigated, Dunn needed to make sure a few things were implemented. The increase in the income and CSI would eventually lead to increase in Dunn’s salary too. First, to increase the income, Dunn could ensure that the technicians completed the affirmation jobs that were done within the warranty period, faster than the amount of time allocated per job. With this, more time could be spared and more jobs could be done per day in the given amount of hours. However, efficiency in the job done would also be something to deal with. Since they had expertise and the CSI percentage would be looked into, that would ensure quality work in a shorter amount of time, to increase their salaries and to increase their additional payments. The CSI was a very vital issue. Therefore, Dunn could also ensure that the experts handled the customers in a way that would lead to a higher percentage of the CSI. All matters in the CSI were not to be ignored. If the technicians handled their work in a keen way to answer each question in the index, the overall CSI percentage would increase per technician. This would lead to increase in their additional payments and thus Dunn’s salary leading to an overall institutionalization of the

Gender Inequality at work place Essay Example | Topics and Well Written Essays - 500 words

Gender Inequality at work place - Essay Example In the society there is need to create definite balance in making analysis about gender inequality, men should as well be considered as the impact of the inequality against women at work place affects them either directly or indirectly. In some cases, they are the victims too. All over the world men and women have naturally done different kinds of work. Men have characteristically done jobs that are much physical in nature and require more efforts whereas women tended to do less physical duties, mostly service-oriented kind of jobs. The three factors that are often used to describe inequality at workplace include cultural factors, discriminatory factors. Cultural values where women in certain countries are not allowed to do some jobs due to state laws, religion, and public view with historical connotations. Race can also be used to hinder one not necessarily women from being given certain jobs basing on cultural beliefs, the discriminatory aspect of it ranges from various instance su ch as sex, age, color of the skin, level of education among others. Race can be a determinant in the segregation of awarding of jobs Devey reiterates that some jobs are kept for white basing on the quality. Social perspectives where by some jobs are predominantly done by certain gender for example mechanical works, engineering among others.Federal state anti-discriminatory laws have been passed and put onto action in several states in the U.S. with effect it has improved availabilities of several opportunities for women at work place.