Chpt4-HW-S07

# Chpt4-HW-S07 - Chapter 4 Homework Solutions 13 The...

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1 Chapter 4 Homework Solutions 13. The stoichiometric coefficients can be interpreted as the related number of moles of reactants and products. Use the molar masses to convert mass to moles and the equation stoichiometry to relate moles. 1.0 g C 12 H 22 O 11 × 1 mol C 12 H 22 O 11 342.2956 g C 12 H 22 O 11 × 12 mol CO 2 1 mol C 12 H 22 O 11 × 44.0095 g CO 2 1 mol CO 2 = 1.5 g CO 2 1.0 g C 12 H 22 O 11 × 1 mol C 12 H 22 O 11 342.2956 g C 12 H 22 O 11 × 12 mol O 2 1 mol C 12 H 22 O 11 × 31.9988 g O 2 1 mol O 2 = 1.1 g O 2 18 . (a) Carbon monoxide = CO(g). 2 C(s) + O 2 (g) 2 CO(g) (b) Nickel(II) oxide = NiO(s). 2 Ni(s) + O 2 (g) 2 NiO(s) (c) Chromium(III) oxide = Cr 2 O 3 (s). 4 Cr(s) + 3 O 2 (g) 2 Cr 2 O 3 (s) 22 . The compound and O 2 are the reactant. The products are CO 2 and H 2 O for these combustion reactions. Balance the equations, starting with C, then H, then O. If the coefficient of O 2 ends up a fraction, multiply everything in the reaction by two, to make all coefficients whole numbers. (a) Unbalanced: ? C 4 H 10 (g) + ? O 2 (g) ? CO 2 (g) + ? H 2 O(g) Balance C: C 4 H 10 (g) + ? O 2 (g) 4 CO 2 (g) + ? H 2 O(g) 4 C’s Balance H: C 4 H 10 (g) + ? O 2 (g) 4 CO 2 (g) + 5 H 2 O(g) 10 H’s Balance O: C 4 H 10 (g) + 13 2 O 2 (g) 4 CO 2 (g) + 5 H 2 O(g) 13 O’s Multiply by 2: 2 C 4 H 10 (g) + 13 O 2 (g) 8 CO 2 (g) + 10 H 2 O(g) (b) Unbalanced: ? C 6 H 12 O 6 (s) + ? O 2 (g) ? CO 2 (g) + ? H 2 O(g) Balance C: C 6 H 12 O 6 (s) + ? O 2 (g) 6 CO 2 (g) + ? H 2 O(g) 6 C’s Balance H: C 6 H 12 O 6 (s) + ? O 2 (g) 6 CO 2 (g) + 6 H 2 O(g) 12 H’s Balance O: C 6 H 12 O 6 (s) + 6 O 2 (g) 6 CO 2 (g) + 6 H 2 O(g) 18 O’s (c) Unbalanced: ? C 4 H 8 O( l ) + ? O 2 (g) ? CO 2 (g) + ? H 2 O(g) Balance C: C 4 H 8 O( l ) + ? O 2 (g) 4 CO 2 (g) + ? H 2 O(g) 4 C’s Balance H: C 4 H 8 O( l ) + ? O 2 (g) 4 CO 2 (g) + 4 H 2 O(g) 8 H’s Balance O: C 4 H 8 O( l ) + 11 2 O 2 (g) 4 CO 2 (g) + 4 H 2 O(g) 12 O’s

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2 Multiply by 2: 2 C 4 H 8 O( l ) + 11 O 2 (g) 8 CO 2 (g) + 8 H 2 O(g) 27. (a) ? Al(s) + ? O 2 (g) ? Al 2 O 3 (s) Select order: Al then O 2 Al(s) + ? O 2 (g) 1 Al 2 O 3 (s) 2 Al 2 Al(s) + 3 2 O 2 (g) 1 Al 2 O 3 (s) 3 O 4 Al(s) + 3 O 2 (g) 2 Al 2 O 3 (s) (b) ? N 2 (g) + ? H 2 (g) ? NH 3 (g) Select order: H then N ? N 2 (g) + 3 H 2 (g) 2 NH 3 (g) 6 H 1 N 2 (g) + 3 H 2 (g) 2 NH 3 (g) 2 N (c) ? C 6 H 6 ( l ) + ? O 2 (g) ? H 2 O( l ) + ? CO 2 (g) Select order: C, H then O C 6 H 6 ( l ) + ? O 2 (g) ? H 2 O( l ) + 6 CO 2 (g) 6 C C 6 H 6 ( l ) + ? O 2 (g) 3 H 2 O( l ) + 6 CO 2 (g) 6 H C 6 H 6 ( l ) + 15 2 O 2 (g) 3 H 2 O( l ) + 6 CO 2 (g) 15 O 2 C 6 H 6 ( l ) +15 O 2 (g) 6 H 2 O( l ) + 12 CO 2 (g) 31 (a) ? H 2 NCl(aq) + ? NH 3 (g) ? NH 4 Cl(aq) + ? N
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