41Grams-Moles-Prob

41Grams-Moles-Prob - 340 milli-grams HCl 22.5 grams H 2 S 3...

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MOLE, AVOGADRO’S NUMBER, AND MOLAR MASS GCHEM I CONCEPT PROBLEMS Molar Avogadro’s Molecule or Compound GRAMS MOLES Formula Unit ATOMS Mass Number Formula Single elements ONLY MOLAR MASS: grams of element or compound per mole (Example: H 2 O = 18.02g/mole) GRAMS TO MOLES: 10.0 gram H 2 O 1 mole H 2 O = 0.555 moles H 2 O 18.02 grams H 2 O MOLES TO MOLECULES: .555 moles H 2 O 6.022*10 +23 molecules = 3.34*10 +23 molecules H 2 O 1 mole H 2 O MOLECULES TO ATOMS: 3.34*10 +23 molecules H 2 O 2 atoms H = 6.68*10 +23 atoms of H 1 molecules H 2 O 1. MOLAR MASS : Calcium _________ Chloride ________ Lead ________ Aluminum _________ NH 4 Cl _________ PbCO 3 ________ ZnCl 2 ________ AgCl _________ NaNO 3 _________ CO 2 ________ FeCl 2 ________ TiCl 4 _________ 2. CONVERT GRAMS OF COMPOUND TO MOLES: 10.0 grams NaOH . 8.42 kilo-grams AgCl
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Unformatted text preview: . 340 milli-grams HCl . 22.5 grams H 2 S . 3. CONVERT MOLES OF COMPOUND TO GRAM: 20.0 moles H . 1.5 milli-moles NaCl . 100.0 moles NaOH . 64.0 moles K 2 SO 4 . 3.5*10-3 milli-moles Na 2 CO 3 100.0 centi-moles Al 2 (S0 4 ) 3 . 4. ATOMS MOLECULES MOLES GRAMS atoms C ? 1.2 moles C . molecules H 2 O ? 1.50 moles H 2 O . moles CuSO 4 ? 4.28 x 10 20 molecules CuSO 4 . atoms O ? 25.5 grams CuSO 4 . grams CO 2 ? 6.56 x 10 +27 molecules CO 2 . grams H 2 O ? 8.24 x 10 34 atoms H . grams AlCl 3 ? 1.25 x 10 18 molecules AlCl 3 . grams C ? 4.64 x 10 36 atoms C . atoms Al ? 23.5 cm3 Al (density Al = 2.75 grs/cm 3 ) 23.5 cm 3 Al . jpechunf109/2005...
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This note was uploaded on 07/28/2011 for the course CHM 2045 taught by Professor Eng during the Spring '10 term at UNF.

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41Grams-Moles-Prob - 340 milli-grams HCl 22.5 grams H 2 S 3...

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