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Understanding Atomic Mass, Moles, and Mole Calculations in Chemistry

In this guide, we explore the concept of atomic mass using carbon as an example and how to find it on the periodic table. Learn how to calculate the formula mass of carbon dioxide (CO2) and determine the number of moles of oxygen in one mole of CO2. We also cover conversions between moles and grams, employing Avogadro's number, and demonstrate practical calculations with lithium. This comprehensive overview will facilitate your understanding of key chemistry concepts relevant to moles, atomic weights, and molecular calculations.

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Understanding Atomic Mass, Moles, and Mole Calculations in Chemistry

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  1. Take your periodic table out

  2. What is atomic mass of CarbonPoint where you can find it in the periodic table! 6 is atomic number not atomic mass Atomic mass= mass of 1 mol

  3. Calculating Formula Mass /molecular weight Write down how you calculate the formula mass of carbon dioxide, CO2. 1 Mole of CO2= (1)12.01 g + 2(16.00 g) =  One mole of CO2 (6.02 x 1023 molecules) has a mass of 44.01 grams Q: How many moles of O are in 1 mole of CO2?

  4. We use Unit factors = ratio of 1:1 to convert 1 mole= 6.022 X 10 ^ 23 atoms 1 mole= atomic mass if an atom( like C) Molecular weight if a molecule (CO2)

  5. Unit factors and conversion • Why are Ratio of 1 significant? 3.09X10^23 atoms =?mol Math rule: If we multiply something on one side we have to do it on the other side Ratio of 1 so we don’t need to worry about that rule

  6. Calculations with Moles:Converting moles to grams How many grams of lithium are in 3.50 moles of lithium? 3.5moles-> ? g lithium 3.50 mol Li 6.94 g Li 24.3 = g Li 1 mol Li What unit factor are we using here? 1 mole= 6.94g Li

  7. Calculations with Moles:Using Avogadro’s Number How many atoms of lithium are in 3.50 moles of lithium? 6.02 x 1023atoms 3.50 mol 2.11 x 1024 = atoms 1 mol What unit factor are we using here? 1 mole= 6.022 X 10 ^ 23 atoms

  8. Calculations with Moles:Converting grams to moles How many moles of lithium are in 18.2 grams of lithium? 18.2 g Li 1 mol Li 2.62 = molLi 6.94 g Li What unit factor are we using here? 1 mole= 6.94g Li

  9. Calculations with Moles:Using Avogadro’s Number How many atoms of lithium are in 18.2 g of lithium? 18.2 g Li 6.022 x 1023 atoms Li 1 mol Li 6.94 g Li 1 mol Li 1.58 x 1024 (18.2)(6.022 x 1023)/6.94 = atoms Li What unit factors are we using here? 6.941 g 1 =mole 1 mole= 6.022 X 10 ^ 23 atoms

  10. We do not have direct unit factor _____g= _______Atomso we go from g-> moles-> atoms

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