Hw3-G1-Stoich - Exercise Set 3 STOICHIOMETRY CHM 2045...

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Exercise Set 3 STOICHIOMETRY CHM 2045 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. a) LiCl b) P 4 O 10 c) P 2 O 5 d) Sc 2 S 3 e) PH 3 f) C 8 H 18 g) I 2 h) N 2 H 4 i) NH 2 j) CS 2 k) H 2 O 2 l) Mg 3 (PO 4 ) 2 m) Fe(NO 3 ) 3 n) BF 3 o) S 2 Cl 2 p) NH 4 Br q) B 2 H 6 r) C 18 H 21 NO 3 s) C 18 H 20 N 2 O 4 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. a) Fe (4 SF) b) Br 2 ( 5 SF) c) Al 2 O 3 (5 SF) d) N 2 O 4 (3 SF) e) KClO 3 (3 SF) f) HgBr 2 (4 SF) g) Na 2 SO 4 (5 SF) h) Mg 3 (PO 4 ) 2 (6 SF) i) C 2 H 5 OH (4 SF) j) (NH 4 ) 3 AsO 4 (5 SF) k) CO 3 2- (4 SF) l) Mg 2+ (5 SF) m) C 12 H 22 O 11 (5 SF) n) FeCl 3 @ 6H 2 O (5 SF) Moles to Mass 3. Calculate the mass in grams of the following: a) 0.150 mol Na b) 0.594 mol S 8 c) 2.787 mol CH 3 Cl d) 5.80 mol N 2 O e) 48.1 mol K 2 CrO 4 f) 9.0 x 10 -3 mol C 2 H 4 g) 0.0205 mol CS 2 h) 0.543 mol H 3 BO 3 i) 0.220 mol Fe 3+ j) 1.00 mol S 2- Mass to Moles 4. Calculate the number of moles from the masses given: a) 3.43 g C b) 0.467 g P 4 c) 41.4 g N 2 H 4 d) 37.5 g H 2 O e) 0.234 g MgBr 2 f) 153 g Al 2 (SO 4 ) 3 g) 2.79 g (C 2 H 5 ) 2 S h) 14.8 g NO 3 - i) 0.0440 g Hg 2 Cl 2 j) 1.18 x 10 -2 g SO 2 k) 34.3 g C 12 H 22 O 11 l) 0.032 g NH 4 + Avogadro's Number 5. Perform the following conversions making use of unit analysis : a) Number of atoms in 0.150 mole Hg b) 2.02 x 10 25 molecules Cl 2 to moles c) 5.8 moles N 2 O to molecules d) 4.35 x 10 21 molecules CO 2 to moles e) 5.23 x 10 25 form units to moles MgS f) Mass of 5.6 x 10 17 Fe atoms g) Number of atoms in 3.78 g Li h) Number of molecules in 31.56 g Br 2
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2 i) 1.12 x 10 24 molecules O 2 to grams O 2 j) Mass of one PF 3 molecule in amu and g k) Number of molecules in 38.1 g N 2 O 5 l) No. of formula units in 159 g PbBr 2 m) Formula units in 0.375 g K 2 O n) 4.5 x 10 15 C 6 H 12 O 6 molecules to g o) 3.58 x 10 22 Kr atoms to grams Kr p) Number of molecules in 0.764 g B 2 H 6 Mass, Moles, Formulas, and Numbers of Particles 6. Perform the following conversions making use of unit analysis : a) No. of P atoms in 7 molecules of P 4 O 6 b) No. of molecules of NH 3 with 15 H atoms c) Moles Cl in 22.0 moles PCl 3 d) 4.1 moles H to moles B 2 H 6 e) Number of S atoms in 25.0 g S 8 f) 33.4 g C 3 H 7 OH to number of C atoms g) 8.46 x 10 18 C atoms in C 4 H 10 to H atoms h) 5.07 moles PH 3 to number H atoms i) 50.0 g Al 2 O 3 to number of Al 3+ ions j) 50.0 g Al 2 O 3 to number of O 2- ions k) 1.48 x 10 23 Br - ions in MgBr 2 to Mg 2+ ions l) 1.48 x 10 23 Br - ions in MgBr 2 to g MgBr 2 7. A sample of glucose, C 6 H 12 O 6 , contains 2.0 x 10 22 atoms of carbon. a)
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Hw3-G1-Stoich - Exercise Set 3 STOICHIOMETRY CHM 2045...

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