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Lect_W4

# Lect_W4 - General Chemistry CHEM 151 Week 4 UA GenChem Week...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 4

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UA GenChem Week 4 Reading Assignment See D2L
UA GenChem Counting Particles Counting Particles Is it practical, in a lab situation, to physically Is it practical, in a lab situation, to physically COUNT COUNT the particles? the particles? NO!! The particles are too small! So – how do we typically measure the amount of a So – how do we typically measure the amount of a substance we have in a laboratory? substance we have in a laboratory? We use the MASS to determine the amount of substance. How is mass related to thenumber of particles? How is mass related to thenumber of particles?

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UA GenChem RelativeMass and Molar Mass 2.0 g of H 2 22.4 L 18.0 g H 2 O 22.4 L 32.0 g O 2 22.4 L 4 Be 9.012 76 Os 190.23 9 F 19.00 RelativeAtomic Mass in atomic mass units (amu) Molar Mass if expressed in grams BY EXPERIMENT Each sample contains AVOGADRO’s Number of particles . 76
UA GenChem Molar Mass Molar Mass The mass of one mole of atoms is called the Molar The mass of one mole of atoms is called the Molar Mass of the element Mass of the element Average Mass Average Mass (g) (g) = = Molar Mass Molar Mass The Molar Mass is the mass of The Molar Mass is the mass of 6.022 x 10 6.022 x 10 23 23 of of particles of a given substance. particles of a given substance. 1 mol of C 1 mol of C = = 6.0221 x 10 6.0221 x 10 atoms of C atoms of C

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UA GenChem What Makes Them Similar/Different? These are one mole of 6 different substances. If weweigh them, the mass we get is called the “Molar Mass” 6.0221 x 10 23 particles or units in each
UA GenChem NEWS Where is our exam? Social Sciences 100 When? Mon. sept 22 5 pm – 6:10 What if you have a class then? Can get a piece of paper and take make-up test When do they stop giving tickets to the other exam? End of this week What do you put on the scantron sheet? Look at D2L When is the preceptor review? Where? Wed.

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Lect_W4 - General Chemistry CHEM 151 Week 4 UA GenChem Week...

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