userdata-paziras-Chem101-Chap_03A

023x10 3 na ions1205x10 3 na ions 23 2 23 1x6023x10

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Unformatted text preview: ­­­­ contains: 2 6.023 x 10 3 H2O molecules: 2 2 ­ 2 x 6.023 x 10 3 H atoms = 12.05 x 10 3 H atoms 23 2 ­ 1 x 6.023 x 10 O atoms = 6.023 x 10 3 O atoms 1 mo le NaCl­­­­­­­­­­­­­­­­­­­­­­­­­­­­ contains: 1 mo le Na2CO3­­­­­­­­­­­­­­­­­­­­­­­­ contains: 2 6.023 x 10 3 formula units of NaCl: 2 ­ 1 x 6.023 x 10 3 Na+ ions 23 - ­ 1 x 6.023 x 10 Cl ions 2 6.023 x 10 3 formula units of Na2CO3: 2 2 ­ 2 x 6.023 x 10 3 Na+ ions = 12.05 x 10 3 Na+ ions 23 2- 23 ­ 1 x 6.023 x 10 CO3 ions = 6.023 x 10 CO32- ions 2 ­ 1 x 6.023 x 10 3 C atoms 2 2 ­ 3 x 6.023 x 10 3 O atoms = 18.07 x 10 3 O atoms 2 Chemistry 101 · MOLAR MASS (MM): Chapter 3 ­ is the mass of one mo le of substance ­ is equal to the Formula Weight expressed in grams 1 mole H2O contains 6.023 x 1023 molecules 1 mole Na2CO3 weighs contains 6.02 x 1023 formula units 18.02 g weighs 105.99 g Examples: 1. Calculate the mass in grams of one He atom. 1 mo l He atoms 1 He atom x ¾¾¾¾¾¾¾¾¾ x ¾¾¾¾¾¾¾ = 2 6.02 x 10 3 He atoms 2. g How many C atoms are there in 4.00 x 10-8 g of propane (C3H8)? 4.00 x 10-8g C3H8 x ¾¾¾¾¾ x ¾¾¾¾¾¾¾¾¾¾¾ x ¾¾¾¾¾¾ NOTE: Set up units so that they cancel out 3 Chemistry 101 Chapter 3 3. How many mo les of Na atoms are there in 50.0 g of Na? 4. What is the mass of 6.30 mo les of lead (II) sulfate ? Formula of lead (II) sulfate: 2+ 2­ PbSO4 PbSO4 ?????? g PbSO4 ? g PbSO4 = 6.30 moles PbSO4 x ¾¾¾¾¾¾¾ 1 mole PbSO4 1 mole PbSO4 = Mol...
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This document was uploaded on 03/18/2014 for the course CHEM 101 at Los Angeles Mission College.

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