How to Work Mass Percent Problems in Chemistry

Chemistry involves mixing one substance with another and observing the results. To replicate the results, its important to measure amounts carefully and record them. Mass percent is one form of measurement used in chemistry; understanding mass percent is important for accurately reporting in chemistry labs. What Is Mass Percent? Mass percent is a method of expressing the concentration of a substance in a mixture or element in a compound. It is calculated as the mass of the component divided by the total mass of the mixture and then multiplied by 100 to get the percent. The formula is: mass percent (mass of component / total mass) x 100% or mass percent (mass of solute / mass of solution) x 100% Usually, mass is expressed in grams, but any unit of measure is acceptable as long as you use the same units for both the component or solute mass and the total or solution mass. Mass percent is also known as percent by weight or w/w%.  This worked example problem shows the steps necessary to calculate mass percent composition. Mass Percent Problem In this procedure, we will work out the answer to the question What are the mass percentages of carbon and oxygen in carbon dioxide, CO2? Step 1: Find the mass of the individual atoms. Look up the atomic masses for carbon and oxygen from the Periodic Table. Its a good idea at this point to settle on the number of significant figures youll be using.  The atomic masses are found to be: C is 12.01 g/molO is 16.00 g/mol Step 2: Find the number of grams of each component make up one mole of  CO2. One mole of CO2 contains 1 mole of carbon atoms and 2 moles of oxygen atoms. 12.01 g (1 mol) of C32.00 g (2 mole x 16.00 gram per mole) of O The mass of one mole of CO2 is: 12.01 g 32.00 g 44.01 g Step 3: Find the mass percent of each atom. mass % (mass of component/mass of total) x 100 The mass percentages of the elements are: For Carbon: mass % C (mass of 1 mol of carbon/mass of 1 mol of CO2)  x 100mass % C (12.01 g / 44.01 g) x 100mass % C   27.29 % For Oxygen: mass % O (mass of 1 mol of oxygen/mass of 1 mol of CO2)  x 100mass % O (32.00 g / 44.01 g) x 100mass % O 72.71 % Solution mass % C 27.29 %mass % O 72.71 % When doing mass percent calculations, it is always a good idea to check to make sure your mass percents add up to 100%. This will help catch any math errors. 27.29 72.71 100.00 The answers add up to 100% which is what was expected. Tips for Success Calculating Mass Percent You wont always be given the total mass of a mixture or solution. Often, youll need to add up the masses. This might not be obvious! You may be given mole fractions or moles and then need to convert to a mass unit.Watch your significant figures!Always make sure the sum of the mass percentages of all components adds up to 100%. If it doesnt, then you need to go back and find your mistake.

Ethical Dilemma Of An Occupational Therapist - 799 Words

Ethical Dilemma # 19 problem indicated issues with an occupational therapist located in a rural school district to provide services outside of their scope of practice. The occupational thera-pist is the only healthcare professional within this school district that provides services. The con-tribution from other healthcare professionals is limited, due to the inability to get professionals from other disciplines, in spite of numerous recruiting efforts and a current open position. The occupational therapist sees the area of concern for the client, but the parent and teacher want the child to walk. Teaching the client how to walk is not in the scope of practice unless it’s functional mobility to engage in an activity or occupation. This situation identifies as an ethical dilemma be-cause it causes conflicts in professional interactions, client interventions, and employment setting. To begin with, this situation is an ethical dilemma due to the controversy of the teacher’s and parent’s areas of concern as opposed to the occupational therapist’s area of concern. It is im-portant to incorporate the parent and teacher areas of concern in the IEP, but the occupational therapist can only practice within the scope of practice and level of competence. There is no other healthcare professional that specializes in walking in the rural school district, but the teacher’s and parent’s goal is for the kindergartener to walk. This causes a conflict in the client’s interven-tions becauseShow MoreRelatedThe Issues Regarding Payment For Treatment1684 Words   |  7 PagesCurrently, health care is experiencing many potential ethical issues regarding payment for treatment. Among the practitioners facing these issues are occupational therapists, who are struggling to figure out how to provide quality care while upholding the reimbursement guidelines. 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Eastbourne †Land use changes as you move towards the sea front Free Essays

Eastbourne is large in tourism and also has a large beach, which has been managed. There has been a big project which lasted for 4 years to rebuild the groins. But by re-building them, it loses beach material. We will write a custom essay sample on Eastbourne – Land use changes as you move towards the sea front or any similar topic only for you Order Now There is lots of land between the beach and houses. If the beach were to disappear, it would bring the economy right down and holiday workers will lose a huge sum of money. Senior citizens come to Eastbourne and retire there. If the beach were to disappear, then there would be a drain on the council’s resources for the senior citizens and they wouldn’t have any supplies for anything. So by providing these people with resources, it obviously counts a lot on the council’s economy as a lot of the money comes out from it, so therefore, the beach should remain there. Hypothesis Land use changed as moved towards the sea front. Method We walked around the area and identified different types of land uses. Along the main road near Eastbourne Station, the variety of individual uses was recorded under different classes such as Residential, Industrial or Commercial. The different types of building were written as a number followed by a code letter, depending on what it was classified as. After this took place, a Questionnaire was made by asking a number of people walking in and around Eastbourne and recording their answers. This consisted things such as how far they travelled to reach Eastbourne and also approximately how far they travelled. Conclusion Eastbourne does have a large sphere of influence. Because it’s famous for its tourist industry, it attracts many senior citizens. There are a large number of hotels, restaurants and shops for local people and the villages around. Eastbourne is a tourist-orientated town with a lot to offer, such as entertainment, cinemas, restaurants and theatres. There are not a large number of young people as it wasn’t a main holiday season or a weekend. If we had done our research on a weekend, we would have seen children stating over. Elderly people have trips to Eastbourne to either relax or retire there. Especially at this time of year from now until early December, there will be a large number of elderly people who go there for ‘tinsel and turkey weekends’, to have their Christmas dinner. There are hotels in Eastbourne for people such as conservatives, so the hotels will offer conference facilities for them. Evaluation If a longer time were spent in Eastbourne, it would have been possible to have spent more time with the surveys on different days, to produce range of different results. Or even on a Saturday or a Sunday, which would have made a big difference. If the questionnaire was taken at different times of the day, like 3 or 4 for example, then there would have been a better spread of results from different age groups, as some children may have been at school at the time or adults may have been at work. Also, if a survey were taken at the coach park, there would have been a spread of locations as we could have noted where the coaches were coming from. How to cite Eastbourne – Land use changes as you move towards the sea front, Papers