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Understanding Moles: Converting Grams to Moles and Vice Versa in Chemistry

This chapter focuses on the concept of the mole and its significance in chemistry. Students will learn the relationship between moles, Avogadro's number, and gram formula mass. The chapter covers how to convert grams of a substance into moles and how to convert moles back into grams using the formulas moles = grams/gram formula mass and mass = moles × gram formula mass. Practical examples, including the conversion for sulfuric acid, demonstrate these calculations, reinforcing the understanding of exothermic and endothermic processes.

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Understanding Moles: Converting Grams to Moles and Vice Versa in Chemistry

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  1. Chapter 10 Chemical Quantities 10.1 The Mole

  2. Chemistry Today we are learning to:-1. Understand the relationship between moles, Avogadro’s number and gram formula mass 2. Use gram formula mass to convert grams of a substance into moles 3. Use gram formula mass to convert moles of a substance into grams

  3. Exothermic and Endothermic Processes 17.1 The Mole • 1 mole is defined a the number of atoms of carbon present in exactly 12g of carbon-12. • This number of atoms is called Avogadro’s number and is equal to 6.022x1023 atoms. • It follows that: • 1 mole of any element = 6.022x1023atoms= atomic mass of element • 1 mole of any compound = 6.022x1023 formula units/molecular formula= gram formula mass of compound • The mole can be abbreviated to mol

  4. Exothermic and Endothermic Processes 17.1 Converting Grams to Moles • To convert from grams to moles use the formula: moles = number of grams x -------------------------------- grams = number of moles x -------------------------------- Gram formula mass 1 mol Gram formula mass 1 mol Converting Moles to Grams • To convert from moles to grams use the formula:

  5. Mass g = number of moles x ---------------------------- Mass g = 40.5 mol x ----------- 98.1 g Gram formula mass 1 mol 1 mol Exothermic and Endothermic Processes 17.1 Converting Moles to Grams Sulfuric acid Ex.1 how many grams are present in 40.5 mol of H2SO4? 1. Identify the knowns and unknowns moles of H2SO4 = 40.5 mass of H2SO4 = ? 3. Plug in the numbers and solve equation 2. Calculate gram formula mass. For H  2 x 1.0 amu = 2.0 amu For S  1 x 32.1 amu = 32.1 amu For O  4 x 16.0 amu = 64.0 amu formula mass =98.1 amu Mass g = 3970 g Try question 27-50 on page 50-51 of review book

  6. END OF SHOW

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