Hw5-Int-Stoich - Exercise Set 5 STOICHIOMETRY CHM 1025 HW...

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Exercise Set 5 STOICHIOMETRY CHM 1025 HW4-G1.STO I. COMPOUND STOICHIOMETRY Chemical Formulas 1. First decide whether each of the following formulas represents an ionic or molecular substance. If molecular, then decide if the formula is molecular-empirical and/or the actual or true molecular formula. 41 0 25 23 3 81 8 a) LiCl b) P O c) P O d) Sc S e) PH f) C H 22 4 2 2 2 2 3 4 2 g) I h) N H i) NH j) CS k) H O l) Mg (PO ) 3 3 3 2 2 4 26 1 82 1 3 m) Fe(NO ) n) BF o) S Cl p) NH Br q) B H C H NO r) 18 20 2 4 s )CHNO 2. Determine the molar mass (the mass of one mole in grams) for each of the following elements or compounds to the indicated number of significant figures. 2 24 a) Fe (4 SF) b) Br ( 5 SF) c) Al O (5 SF) d) N O (3 SF) 32 2 4 3 4 2 e) KClO (3 SF) f) HgBr (4 SF) g) Na SO (5 SF) h) Mg (PO ) (6 SF) 4 3 4 3 i) C H OH (4 SF) j) (NH ) AsO (5 SF) k) CO (4 SF) l) Mg (5 SF) 2- 2+ 12 11 3 2 m) C H O (5 SF) n) FeCl @ 6H O (5 SF) Moles to Mass 3. Calculate the mass in grams of the following: 83 2 a) 0.150 mol Na b) 0.594 mol S c) 2.787 mol CH Cl d) 5.80 mol N O 2 4 2 3 3 e) 48.1 mol K CrO f) 9.0 x 10 mol C H g) 0.0205 mol CS h) 0.543 mol H BO -3 i) 0.220 mol Fe j) 1.00 mol S 3+ Mass to Moles 4. Calculate the number of moles from the masses given: 42 4 2 a) 3.43 g C b) 0.467 g P c) 41.4 g N H d) 37.5 g H O 2 2 43 2 52 3 e) 0.234 g MgBr f) 153 g Al (SO ) g) 2.79 g (C H ) S h) 14.8 g NO - 2 2 2 4 i) 0.0440 g Hg Cl j) 1.18 x 10 g SO k) 34.3 g C H O l) 0.032 g NH -2 + Avogadro's Number 5. Perform the following conversions making use of unit analysis : 2 a) Number of atoms in 0.150 mole Hg b) 2.02 x 10 molecules Cl to moles 25 c) 5.8 moles N O to molecules d) 4.35 x 10 molecules CO to moles 21 e) 5.23 x 10 form units to moles MgS f) Mass of 5.6 x 10 Fe atoms 17 2 g) Number of atoms in 3.78 g Li h) Number of molecules in 31.56 g Br
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2 22 3 i) 1.12 x 10 molecules O to grams O j) Mass of one PF molecule in amu and g 24 25 2 k) Number of molecules in 38.1 g N O l) No. of formula units in 159 g PbBr 26 1 2 6 m) Formula units in 0.375 g K O n) 4.5 x 10 C H O molecules to g 15 o) 3.58 x 10 Kr atoms to grams Kr p) Number of molecules in 0.764 g B H Mass, Moles, Formulas, and Numbers of Particles 6. Perform the following conversions making use of unit analysis : 46 3 a) No. of P atoms in 7 molecules of P O b) No. of molecules of NH with 15 H atoms 32 6 c) Moles Cl in 22.0 moles PCl d) 4.1 moles H to moles B H 83 7 e) Number of S atoms in 25.0 g S f) 33.4 g C H OH to number of C atoms 41 0 3 g) 8.46 x 10 C atoms in C H to H atoms h) 5.07 moles PH to number H atoms 18 23 i) 50.0 g Al O to number of Al ions j) 50.0 g Al O to number of O ions 3+ 2- 2 k) 1.48 x 10 Br ions in MgBr to Mg ions l) 1.48 x 10 Br ions in MgBr to g MgBr - 2+ - 61 7. A sample of glucose, C H O , contains 2.0 x 10 atoms of carbon. a) How many atoms of hydrogen does the sample contain? b) How many molecules of glucose are present within the sample?
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This note was uploaded on 11/16/2011 for the course CHM 1025 taught by Professor J during the Summer '09 term at Santa Fe College.

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Hw5-Int-Stoich - Exercise Set 5 STOICHIOMETRY CHM 1025 HW...

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