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The Mole Molar Mass

The Mole Molar Mass. Defining the Mole. Atoms are small so there are a lot of them present in samples we use on our large scale. The number of atoms found in exactly 12 grams of pure carbon-12 has been defined as the number of particles in 1 mole of any substance.

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The Mole Molar Mass

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  1. The MoleMolar Mass

  2. Defining the Mole Atoms are small so there are a lot of them present in samples we use on our large scale. The number of atoms found in exactly 12 grams of pure carbon-12 has been defined as the number of particles in 1 mole of any substance. 6.02 x 1023 particles / 1 mol

  3. Avogadro’s Number Avogadro’s number can be used to determine the number of moles that would represent a specific number of particles. Arrange this relationship as a conversion factor and use dimensional analysis to solve.

  4. Representing Substances Proper notation shows the amount, unit, then substance for the sample. Abbreviations are useful but order is what matters the most! 3.50grams of water 3.50g H2O

  5. Moles-Particles Practice 1) Convert the following to moles using Avogadro’s number: 3.5 x 1024atoms 2.57 x 1021molecules 7.447 x 1023 ions 1.00 x 1027atoms

  6. Moles-Particles Practice 2) Complete the table below:

  7. Comparing Using Mass Mass (in grams) measures the amount of a sample present by comparing it to a standard.

  8. Counting Particles Moles measure the amount of a sample present by counting exactly how many particles are present.

  9. Counting by Mass Knowing the molecular weight (Molar Mass) of a substance allows you to count particles by weighing a sample.

  10. Finding Molar Mass To determine the molecular weight of an atom, we can use the average atomic mass shown on the periodic table. For compounds, add all the masses.

  11. Molar Mass Practice 3) Find Molar Mass for each of these: a) Na b) F2 c) H2O d) MgS e) CO2 f) H2SO4 g) NO3

  12. Moles to Mass How many grams are in 4.75 mol H2O? To convert grams to moles of a substance, first find the molar mass. Now use dimensional analysis to solve.

  13. Moles to Mass Practice 4) Find the mass in each sample below: 2.5 mol Ca 6.75 mol SO3 0.500 mol N2 1.375 mol H2CO3

  14. Mass to Moles How many moles are in 95.2 g CO2? To convert mole to grams of a substance, first find the molar mass. Now use dimensional analysis to solve.

  15. Mass to Moles Practice 5) Find the moles of each sample below: 65.75 g Ba 29.5 g PCl3 3.396 g H2 4.54 Kg KMnO4

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