Avogadros Number To Calculate Mass of a Single Atom

Avogadros number is one of the most important constants used in chemistry. It is the number of particles in a single mole of a material, based on the number of atoms in exactly 12 grams of the isotope carbon-12. Although this number is a constant, its experimentally determined, so we use an approximate value of 6.022 x 1023. So, you know how many atoms are in a mole. Heres how to use the information to determine the mass of a single atom. Avogadro's Number Example Problem: Mass of a Single Atom Question: Calculate the mass in grams of a single carbon (C) atom. Solution To calculate the mass of a single atom, first look up the atomic mass of carbon from the periodic table.This number, 12.01, is the mass in grams of one mole of carbon. One mole of carbon is 6.022 x 1023 atoms of carbon (Avogadros number). This relation is then used to convert a carbon atom to grams by the ratio: mass of 1 atom / 1 atom mass of a mole of atoms / 6.022 x 1023 atoms Plug in the atomic mass of carbon to solve for the mass of 1 atom: mass of 1 atom mass of a mole of atoms / 6.022 x 1023 mass of 1 C atom 12.01 g / 6.022 x 1023 C atomsmass of 1 C atom 1.994 x 10-23 g Answer The mass of a single carbon atom is 1.994 x 10-23 g. Applying the Formula to Solve for Other Atoms and Molecules Although the problem was worked using carbon (the element upon which Avogadros number is based), you can use the same method to solve for the mass of an atom or molecule. If youre finding the mass of an atom of a different element, just use that elements atomic mass. If you want to use the relation to solve for the mass of a single molecule, theres an extra step. You need to add up the masses of all of the atoms in that one molecule and use them instead. Lets say, for example, you want to know the mass of a single atom of water. From the formula (H2O), you know there are two hydrogen atoms and one oxygen atom. You use the periodic table to look up the mass of each atom (H is 1.01 and O is 16.00). Forming a water molecule gives you a mass of: 1.01 1.01 16.00 18.02 grams per mole of water and you solve with: mass of 1 molecule mass of one mole of molecules / 6.022 x 1023 mass of 1 water molecule 18.02 grams per mole / 6.022 x 1023 molecules per mole mass of 1 water molecule 2.992 x 10-23 grams

Online Therapy Sites - 1574 Words

Online Therapy Sites Online therapy is professional counseling services that are offered over the internet. Online therapy allows clients and professionals to communicate over the internet without having to communicate in the traditional office visits. In addition, online therapy allows clients and patients to attend online counseling in which the clients will feel more comfortable and less intimidated. On the other hand, clients are more likely to be open and honest when communicating through online sessions. As a result, counselors will be able to provide better and more effective treatment options and plans for the clients. Furthermore, online therapy is available to clients who have difficulty making appointments on-time and in the†¦show more content†¦Before beginning the online process, each client has to fill out an online questionnaire. Once Jacqueline receives the client’s questionnaire, she will then review it and provide suggestions. Clients can e-mail her as many times as they would like. Furthermore, if a client wants to communicate over the phone, then Jackie will prepare a different schedule for the clients in which it is a different process than the online process (Marriage Matters, LLC - Online Counseling, 2013). Additionally, Jackie provides online counseling that allows clients to work with their spouses through online interaction. In general, Jackie believes that online counseling works because clients are able to get assistance quickly about their main concerns. Nevertheless, Jackie feels that she provides a concrete understanding and provides suggestions and recommendations that will help clients to clarify, resolve, or improve the situation that is present. Jackie strives at working with many clients by providing follow-up clarification and explanations if need be. This will help clients to improve their lives and be able to move forward in life without any obstacles. 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Original writing †My Decision about a Scary Ride Free Essays

As we entered the gigantic theme park on a lovely summer day a voice from behind us shouted, â€Å"STOP!† We quickly turned around like spinning machines and we saw a 6 foot tall security guard running toward us like fast cheetah, his face was red like a rosy red tomato and it looked like his hat was going to fall off. I got a bit nervous because he was running towards us like we had just killed someone. I turned around and looked at Alisha and I saw that she was looking down with embarrassment, then I looked around me and I saw that everyone was staring at us like we had committed some sort of crime. We will write a custom essay sample on Original writing – My Decision about a Scary Ride or any similar topic only for you Order Now â€Å"Girls you have forgotten your tickets† the security guard said. I felt so relieved that I let out a big sigh, like I had just ran a marathon, and Alisha and I started to laugh. After that we got our tickets from the security guard and headed towards the first ride which was called Space Invaders. When we got to the Space Invaders I could smell the horrible smell of oil, which smelt like a leaking gas, which made me feel a bit sick. I could also hear the big racket of the ride, and the screaming and shouting of the people on it, when it went whooshing past me in to the far distance like a crying baby slowly falling asleep. We waited in the queue for about ten minutes before it was our turn. When we got off the Space Invaders Alisha and I were just about to walk to the next ride when we saw a group of people that looked a bit like the characters from Harry Potter. One of them had bright red hair which made it look like his hair was on fire, this boy looked the same as Ronald from Harry Potter. Another boy that was with him had really big glasses that covered half of his face and it looked like the character of Harry Potter, and there was one girl that had white hair which made her look about 90 years old. I glared at there faces properly and they looked quite familiar so I said to Alisha, â€Å"Alisha don’t these people look familiar?† and she said, â€Å"Yes they do look quite familiar.† Now we were both confused, so we decided to forget about it and walk off All of a sudden they started taking there hair off which made us realise that they were not a weird group of people but they were someone else. They were the rest of our mates Aziza, Amana and Sabah. Alisha and I looked at each other and burst out laughing. Then we said to the rest of our friends, â€Å"Come on lets go on the next ride†. All my friends wanted to go on the big tall rides but I was too frightened to go on them, but I was too ashamed to say it. The reason I didn’t want to go on these big tall rides was when I was about five years old I sat on a really big ride and my seat belt was not tied properly so I nearly feel out. Ever since then I have hated sitting on big rides. I was not that ashamed to say it to Alisha because she is my best friend, but I do not want to say it in front of the rest of my friends because they will start calling me names. My friends were on their way to queue up for the next ride when I shouted, â€Å"I don’t want to go on that ride yet, let’s go on the Water Log first!† They all turned around and looked at me in a puzzled way and said â€Å"Okay we will go on that ride first but after that we are going on this big one.† I said, â€Å"Okay then†. I felt a bit relieved, but I was still scared. When we reached for the queue off the Water Log I saw that the queue was really long which made me feel a bit better because it will give me a bit more time to think of a good excuse not to go on the ride. All of my mates were laughing and enjoying themselves but I was just stood there like a statue staring at the big scary ride that I had to go on. Sabah noticed that I was staring at the ride so she said, â€Å"Why are you staring at that ride?† â€Å"Are you scared or something?† and I mumbled under my breath like a noise from a distance â€Å"No, why would I be scared.† Finally, it was our turn to sit on the Water Log. A big brown train splashing through the water like a sailing boat came in front of us and at the side of it said â€Å"The Water Log†. It was written in big bold writing. We quickly jumped in to the train and the ride set off. Whilst it was going up my eyes were fixed on the big tall ride, like a hunter on its target. I was the only one out of our group that was not enjoying themself. I was concentrating so hard on the next ride I was going to go on that I did not even realise that the ride I was sat on was about to finish. When we got off the Water Log Amana said, â€Å"Now its time for us to go on that big ride.† I just looked at her face and said â€Å"Can we go to the toilet first?† All of my mates glared at me and Alisha said, â€Å"We listened to you, now you will have to listen to us.† And I just mumbled, â€Å"Okay then.† Then all off my friends starting screaming with excitement. Alisha gripped me by the hand and dragged me towards the ride like she was dragging a rope in a game of tug of war. When we got to the ride I saw that the queue was really long. When I looked ahead of me the queue looked like a long colourful, slithery snake. I said to my friends, â€Å"I don’t feel well you lot go on the ride and I will wait for you at the exit.† But they just said â€Å"No it will be better if we all go on together.† So I just said, â€Å"Okay then.† After this, I decided that I was not going to make any more excuses because it would make it obvious to my friends that I was scared. Whenever I looked up at the ride I could imagine myself as a five year old girl falling off which made me feel like crying. I could hear the whooshing of the ride vibrating in my ears and my heart was beating as fast as a drum. The biggest drop of the ride looked like a big blue tower stretched out 100 miles above the ground. And the rest of the ride stretched out in different directions as far as I could see. There was one more group of people to go on the ride and then it was our turn. I looked towards my friends and they were really excited, they were screaming and jumping around like kangaroos. Finally it was our turn, the people that were on the train before us got off, and all off the sudden the gates opened and people started to get on the ride. I went up to the seat and was just about to sit down when a weird feeling passed through me and made me blurt out to my friends â€Å"I don’t want to go on this ride I am too scared.† My friends looked up at me and said, â€Å"But a thought you wanted to go on this ride.† They got off the ride and took me to a side where I told them the reason why I was scared of rides. When I told them the reason I expected them to laugh but they did not laugh at all Sabah just said, â€Å"Why are you ashamed that you are scared off a rollercoaster?† and Alisha said, â€Å"The first time I went on a rollercoaster I was even scared.† They all agreed with her. Then Aziza said, â€Å"Come on lets all of us go on this rollercoaster together.† But I was still too scared to go on it. So they decided that if I didn’t go on it they were not going to go on it either which made me feel a bit guilty, so I decided that I will go on the rollercoaster with them. When I got on to the rollercoaster, I grabbed the metal part of the seat belt which was freezing cold like ice. I tied it up and got the bar of the seat down. Then all of a sudden the ride started to go. I could hear people screaming and shouting like animals from behind me but I could not see anything because I decided to close my eyes. When we get to the top all my friends started saying â€Å"Open your eyes.† So I opened my eyes and started screaming like a baby, but once it started going down the drop I really enjoyed myself. After the ride had stopped I enjoyed myself so much that I wanted to go on it again but unfortunately I couldn’t because the ride had closed. I was not scared on a ride ever again. It’s good to over come your fears. How to cite Original writing – My Decision about a Scary Ride, Papers

The Scarlett Letter Essay Example For Students

The Scarlett Letter Essay The Book I need to read is the Scarlett Letter. It is too hard so I just do it the easy way and come to cheat in the internet. of course. SO I guess then that i have to makes this at least 250 words long or they wont accept me so I will keep on writing crap until I hit the specified amount to be able to go and cheat or else Im doomed for there is no way anyone will make me read that book. Especially do all of that which my lovable English teacher left me for christmas vacations. Hint word: Vacations. But apperently she didnt get it and just decided to give us the first 5 chapter to read plus the something House which is the foreword. Oh not to forget a half a page summary on each chapter, a term paper from each chapter which includes the partial quote, the type of speech, and not to forget the effect that sentence has on the paragraph it is on. That is my homework for christmas break which i have decided to do as always to the end. I admit it. I procrastinate frequently and Im not very proud of it but I am also not at all proud to have to read and waste part of my vacation doing HOMEWORK!!! So I just checked again if I had at least the required amount of letter but it appears for the second time in a row that I do not. So I shall be forced to keep on writting pure B.S. until I finish with the so called requirements. So here I am wasting my valuable time while I could be some where else just doing nothing or maybe even reading the damn book. For what I have spent here is what it would of taken me to do at least Chapter One which amazingly is only 2 pages long! not that bad considering that the letters are of microscoping size. Lets check again if I am successfully done. So here it goes again. If not then Ill be back.