How to Convert Grams to Moles and Vice Versa

This worked example problem shows how to convert the number of grams of a molecule to the number of moles of the molecule. Why would you need to do that? This type of conversion problem mainly arises when you are given (or must measure) the mass of a sample in grams and then need to work a ratio or balanced equation problem that requires moles. Key Takeaways: Converting Moles to Grams (and Vice Versa) Grams and moles are two units to express the amount of matter in a sample. There is no conversion formula between the two units. Instead, you must use atomic mass values and the chemical formula to do the conversion.To do this, look up atomic masses on the periodic table and use the formula mass to know how many atoms of each element are in a compound.Remember, subscripts in a formula indicate number of atoms. If there is no subscript, it means there is only one atom of that element in the formula.Multiply the number of atoms of an element by its atomic mass. Do this for all the atoms and add the values together to get the number of grams per mole. This is your conversion factor. Grams to Moles Conversion Problem Determine the number of moles of CO2 in 454 grams of CO2. Solution First, look up the atomic masses for carbon and oxygen from the periodic table. The atomic mass of C is 12.01, and the atomic mass of O is 16.00. The formula mass of CO2 is: 12.01 2(16.00) 44.01 Thus, one mole of CO2 weighs 44.01 grams. This relation provides a conversion factor to go from grams to moles. Using the factor 1 mol/44.01 g: moles CO2 454 g x 1 mol/44.01 g 10.3 moles Answer There are 10.3 moles of CO2 in 454 grams of CO2. Moles to Grams Example Problem On the other hand, sometimes youre given a value in moles and need to convert it to grams. To do this, first calculate the molar mass of a sample. Then, multiply it by the number of moles to get an answer in grams: grams of sample (molar mass) x (moles) For example, find the number of grams in 0.700 moles of hydrogen peroxide, H2O2. Calculate the molar mass by multiplying the number of atoms of each element in the compound (its subscript) times the atomic mass of the element from the periodic table. Molar mass (2 x 1.008) (2 x 15.999) Note the use of more significant figures for oxygenMolar mass 34.016 grams/mol Multiply the molar mass by the number of moles to get the grams: grams of hydrogen peroxide (34.016 grams/mol) x (0.700 mol) 23.811 grams There are 23.811 grams of hydrogen peroxide in 0.700 moles of hydrogen peroxide. Performing Grams and Moles Conversions Here are some tips for performing these conversions: The two problems most commonly encountered are setting up the problem incorrectly, so the units dont cancel out and give the correct result. It helps to write out the conversion and make sure units cancel. You may want to draw a line through them in complex calculations to keep track of active units.Watch your significant figures. Chemistry professors are unforgiving when it comes to reporting an answer, even if you set up the problem correctly. Moles to Grams Conversion Problem Sometimes you are given moles and need to convert it into grams. This worked example problem shows you  how to convert moles to grams. Problem Determine the mass in grams of 3.60 mol of H2SO4. Solution First, look up the atomic masses for hydrogen, sulfur, and oxygen from the  periodic table. The atomic mass is 1.008 for H, 32.06 for S, and 16.00 for O.  The formula mass  of H2SO4  is: 2(1.008) 32.06 4(16.00) 98.08 Thus, one mole of H2SO4  weighs 98.08 grams. This relation provides a conversion factor to go from grams to moles. Using the factor 98.08 g / 1 mol: grams H2SO4   3.60 mol x 98.08 g / 1 mol 353 g H2SO4 Answer There are 353 grams of H2SO4 in 3.60 moles of H2SO4.

Essay on Multicultural Matrix and Analysis Worksheet

University of Phoenix Material Multicultural Matrix and Analysis Worksheet Instructions: Part I: Select and identify six groups in the left-hand column. Complete the matrix. Part II: Write a summary. Part III: Format references consistent with APA guidelines. Part I: Matrix | What is the group’s history in the United States? | What is the group’s population in the United States? | What are some attitudes and customs people of this group may practice? | What is something you admire about this group’s people, lifestyle, or society? | 1. White Americans | Whites here in the United States are classified as individuals that have origins with the Middle East, Europeans, and North Africa (U.S. Census Bureau, 2001). | A large part†¦show more content†¦Also, Black Americans have strong religious beliefs and I admire that the most. | 3. Hispanics | The United States citizens who are Spanish-speaking who were somehow brought into the country due to the end results of the Mexican War are considered as being Mexican Americans. Hispanic immigration into the United States is caused because of two reasons: an escape from any political persecution and for economic opportunities (Rodriguez, 1995). | Hispanics are currently th e fastest-growing minority group in the United States constituting 16.3% of the nation’s entire population. There population is 42,687,224. | The attitudes and customs of Hispanics have a major presence on music, food, holidays, dance, and arts here in the United States. The Hispanic families in the United States are traditionally close-knit groups, and Spanish speakers are quite formal toward each other when speaking. | Family ties among Hispanics are very strong, and this is what I mostly admire about their race. Hispanic families often come together for different occasions (birthdays, holidays, baptisms, etc.) and they teach their children the importance of good manners, and respect for their elders. A good quality to have today. | 4. Pacific Islanders | The United States and Europe claimed political power over the Polynesian Islands which led to the United States overthrowing the individual monarchies of the islands. | PacificShow MoreRelatedMulticultural Matrix and Analy sis Worksheet Essay2249 Words   |  9 PagesUniversity of Phoenix Material Multicultural Matrix and Analysis Worksheet Instructions: Part I: Select and identify six groups in the left-hand column. Complete the matrix. Part II: Write a summary. Part III: Format references consistent with APA guidelines. 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Malcolm Xs Struggle free essay sample

A look at the mission and goals that Malcolm X set himself. This paper briefly explores the African-American nationalistic goals of Malcolm X. It presents a passage from one of his speeches and examines this in light of his dreams and aims for the African American people. It compares his struggle to other freedom fighting leaders. Self-determinism seems like a concept that should be basic and unassailable. Yet, throughout mankinds history, groups and individuals have fought their entire lives and often died in the quest for the capacity to determine their own fates and to fight against the control of others who truly have no business controlling them. The lucky live to see the day when their dreams are brought to at least some level of fruition. The colonials, for instance, fought the British for an independent America and after a hard-fought and bloody Revolutionary War, those who survived did indeed see and enjoy a free America. We will write a custom essay sample on Malcolm Xs Struggle or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Granted, America had its own share of issues after the British were expelled no viable system of government, spouts of tory violence and lack of infrastructure and political viability but still, the revolutionaries at least lived to see the day when they could assert their own rights and live unshackled by an imperialist power.