Percent Yield Definition and Formula

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%. If the actual and theoretical yield ​are the same, the percent yield is 100%. Usually, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Reasons for this can include incomplete or competing reactions and loss of sample during recovery. Its possible for percent yield to be over 100%, which means more sample was recovered from a reaction than predicted. This can happen when other reactions were occurring that also formed the product. It can also be a source of error if the excess is due to incomplete removal of water or other impurities from the sample. Percent yield is always a positive value. Also Known As: percentage yield Percent Yield Formula The equation for percent yield is: percent yield (actual yield/theoretical yield) x 100% Where: actual yield is the amount of product obtained from a chemical reactiontheoretical yield is the amount of product obtained from the stoichiometric or balanced equation, using the limiting reactant to determine product Units for both actual and theoretical yield need to be the same (moles or grams). Example Percent Yield Calculation For example, the decomposition of magnesium carbonate forms 15 grams of magnesium oxide in an experiment. The theoretical yield is known to be 19 grams. What is the percent yield of magnesium oxide? MgCO3 → MgO CO2 The calculation is simple if you know the actual and theoretical yields. All you need to do is plug the values into the formula: percent yield actual yield / theoretical yield x 100% percent yield 15 g / 19 g x 100% percent yield 79% Usually, you have to calculate the theoretical yield based on the balanced equation. In this equation, the reactant and the product have a 1:1 mole ratio, so if you know the amount of reactant, you know the theoretical yield is the same value in moles (not grams!). You take the number of grams of reactant you have, convert it to moles, and then use this number of moles to find out how many grams of product to expect.

Donating Can Save The World - 1746 Words

Donating Can Save the World Growing up looking at the homeless people in my community, I would often feel bad for them but I would usually remember a saying in my family, which is â€Å"they have arms and legs so they could work†. Often time’s people say sayings like this â€Å"they have arms and legs so they could work† but they do not realize that this implies us judging. In some situations, people are also trying to avoid the homeless persons because they do not want to give them money. This may be seen as a selfish act but it could also be viewed as an act of self-preservation since people do not know if the less fortunate people are trustworthy. People are not necessarily trying to understand where that homeless person might be coming from, in which, they jump into conclusions so they won’t have the guilt of not donating or helping. This might be showing a lack of empathy because people do not want to have the responsibility to provide for the basic needs of those less fortunate. Empathy is defined as being able to understanding what the other person is feeling. People do not necessarily have to provide with IPod’s or tablets but with only the basic needs, which are food, shelter and clothing. People should have the responsibility to provide for the basic needs of others, although how they provide should be an individual’s choice because helping others allows society to change for the better. In order to make society better, people must take responsibility for those lessShow MoreRelatedSave a Life842 Words   |  4 PagesSave a Life TOPIC: Organ Donating ORGANIZATION: Problem/ Solution SPECIFIC PURPOSE: I would like my audience to believe that acquiring information about organ donating will save lives and encourage people to donate. INTRODUCTION: I. Attention Getter: You have the ability to save lives by simply dying. What am I talking about? I am talking about organ donors. 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Introduction to Community Services Samples †MyAssignmenthelp.com

Question: Discuss about the Introduction to Community Services. Answer: United Nations in the year 1955 considered community organisation to be synonymous with community development. Murray G. Ross defined community organisation as a process with the help of which community identifies the objectives and helps in developing collaborative activities within the community (McGorry, Bates Birchwood, 2013). The Australian Community Workers Association started around 45 years ago in a meeting that was held at Sydney on the 16th of April 1969. After a lot of discussion, the attendees of the meeting formed an association that will represent the community workers that will be irrespective of the field of practice. There are different views regarding how the community sector should be defined. Traditional methods that can define the Australian Community Sector are: organisation type, legal status, service provision and service type. Community Organizations in Australia fall under the ambit of following categories like health, personal growth, social welfare and self-help for disadvantaged class. The community based organizations operate within a locality and helps in insuring the community with the sustainable provision in relation to community service in the sector of health, education, social welfare and personal growth (Burford, 2017). Community becomes directly involved in the operation when a monetary support is generated. In the developing countries, community organizations focus on the arena of community strengthening that includes awareness in relation to HIV/ Aids Awareness, health clinics, orphan children support and related to economic issues. The three basic models in relation to community organization are locality development, social planning and social action. In the sector of leadership development, it revolves around meeting needs of target population. This method was earlier made use of by the settlement houses. Social planning revolves around the method in relation to working with large population. The primary focus is regarding the evaluation of welfare needs and planning blue print that will ensure efficient delivery of service. It accounts for a responsive model that addresses the needs of community. Social action is employed by sub-committees who feel that they have adequate power to meet the needs. They come face to face with that of power structure and make use of conflict as a method to solve issues relating to inequalities along with that of deprivation. Community Organization theories help in understanding why the communities behave in a certain way and can be divided into four groups- systems and ecological theory, conflict theory, resource mobilization and constructivist theory. The systems theory lays emphasis on the element of community maintenance and maintenance is indicative of reiteration of values that are deeply held. The conflict theory concedes that there is competition prevailing in the society and is divided between haves and have-nots. Businesses are divided into different camps-some cater to the needs of affluent customers whereas there are others who provide essential services (Wakerman et al., 2017) The Resource mobilization theory states that alliances are formed between working class people so that they can demand for better working conditions. The Constructivist theory makes use of informal knowledge to build the brand reputation of a business and thus increase its influence within community. The non-profit organizations overlap with the service rendered by the government in the arena of education and medical care. Governments use the non-profits to undertake different activities that can reach the local population that has culturally sensitive material (Garling, et al., 2013). The community service organizations help in devolving programs to the state authorities and provide valuable service without incurring bureaucratic red tape. References: Burford, G. (2017).Family group conferencing: New directions in community-centered child and family practice. Routledge. Garling, S., Hunt, J., Smith, D., Sanders, W. (2013).Contested governance: culture, power and institutions in Indigenous Australia(p. 351). ANU Press. McGorry, P., Bates, T., Birchwood, M. (2013). Designing youth mental health services for the 21st century: examples from Australia, Ireland and the UK.The British Journal of Psychiatry,202(s54), s30-s35. Wakerman, J., Humphreys, J., Wells, R., Kuipers, P., Entwistle, P., Jones, J. (2017). A systematic review of primary health care delivery models in rural and remote Australia 1993-2006.