객관식
When 5.0 moles of butane (C_4H_{10}) react completely with oxygen, how many moles of carbon dioxide (CO_2) are produced?
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3. Chemical Reactions
Stoichiometry
객관식
Which of the following compounds produces the greatest number of moles of ions per mole of formula units when dissolved in water?
A
NaCl
B
AlCl3
C
K2SO4
D
CaCl2
검증된 단계별 안내1
Identify the ions produced by each compound when it dissolves in water by writing their dissociation equations.
For NaCl, the dissociation is: \(\mathrm{NaCl (s) \rightarrow Na^{+} (aq) + Cl^{-} (aq)}\), producing 2 moles of ions per mole of NaCl.
For AlCl3, the dissociation is: \(\mathrm{AlCl_3 (s) \rightarrow Al^{3+} (aq) + 3Cl^{-} (aq)}\), producing 4 moles of ions per mole of AlCl3.
For K2SO4, the dissociation is: \(\mathrm{K_2SO_4 (s) \rightarrow 2K^{+} (aq) + SO_4^{2-} (aq)}\), producing 3 moles of ions per mole of K2SO4.
For CaCl2, the dissociation is: \(\mathrm{CaCl_2 (s) \rightarrow Ca^{2+} (aq) + 2Cl^{-} (aq)}\), producing 3 moles of ions per mole of CaCl2. Compare the total moles of ions from each compound to determine which produces the greatest number.
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